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5w4bk2 | How can we be sure of the precision and accuracy of modern measurement tools? | Suppose I have defined a 'redditmeter' [rm] in some acceptable way (that is - I can always know that this 'thing' that I measure is indeed rm units in size). After a few months, a new way was invented to measure 0.5rm, so on so forth - we get to the smallest scales.
I logically conclude that this process is a very cru... | askscience | {
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"Currently, most units of measurements are derived from fundamental physical properties. For example, the meter is defined as the distan... | {
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"url": [
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} | How can we be sure of the precision and accuracy of modern measurement tools?
Suppose I have defined a 'redditmeter' [rm] in some acceptable way (that is - I can always know that this 'thing' that I measure is indeed rm units in size). After a few months, a new way was invented to measure 0.5rm, so on so forth - we get... | [
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1txe13 | Which one of these is more energy efficient? 1. Climbing a staircase skipping one step at a time. 2. Climbing a staircase without skipping any steps. | askscience | {
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"[_URL_0_](_URL_0_)\n\n > This double-step strategy required a greater activity for propulsion during stance for the ankle and knee extensors. In summa... | {
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} | Which one of these is more energy efficient? 1. Climbing a staircase skipping one step at a time. 2. Climbing a staircase without skipping any steps.
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1yp97p | How do we know days were shorter in the past? | askscience | {
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"Geological tidal records show the daily/seasonal deposits of silt. Which show that the hours in a day during the reign of the dinosaurs was about 21 hours\n\nThe moon is the cause of the elongated days. Slowly slowing the Earth down.\n\nEdi... | {
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} | How do we know days were shorter in the past?
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invl4 | If I want to work in an observatory, what type of degree should I get? | I'm currently brushing up on all my highschool math that I forgot while earning my bachelor's degree in art school. What degree do I need to work in an observatory, mapping the heavens? I'm seriously considering this. | askscience | {
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"I worked at an observatory, and am now working on a PhD in astronomy. Nearly all of the telescope operators I know, both at my former employer and at many other sites, don't have PhD's. Many of them have a masters in physics or astronomy, h... | {
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} | If I want to work in an observatory, what type of degree should I get?
I'm currently brushing up on all my highschool math that I forgot while earning my bachelor's degree in art school. What degree do I need to work in an observatory, mapping the heavens? I'm seriously considering this. | [
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klyu1 | Could one freeze an electric dipole moment into ice? | This [comment](_URL_0_) got me thinking. Suppose we applied a large voltage differential across a container of water as it froze. (and then removed this voltage differential after freezing) Would the molecules of water freeze *more* along this orientation than just randomly? What if we dissolved some ions in the water ... | askscience | {
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"Interesting. What you are asking is whether you can make a permanent electret out of ice. \n\nI don't it's possible for water/ice to have a persistent oriented dipole. It's too easy for water molecules to exchange protons with one anoth... | {
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} | Could one freeze an electric dipole moment into ice?
This [comment](_URL_0_) got me thinking. Suppose we applied a large voltage differential across a container of water as it froze. (and then removed this voltage differential after freezing) Would the molecules of water freeze *more* along this orientation than just r... | [
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5i2uuk | Why is SO2 possible, but not S2O? | Or for example why is H2SO4 possible, but not H2OS4? This question may sound dumb, but I can't work it out. Sulphur and oxygen have the same amount of electrons in the valence shell, so shouldn't they be interchangeable in compounds? | askscience | {
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} | Why is SO2 possible, but not S2O?
Or for example why is H2SO4 possible, but not H2OS4? This question may sound dumb, but I can't work it out. Sulphur and oxygen have the same amount of electrons in the valence shell, so shouldn't they be interchangeable in compounds? | [
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jomy5 | What's the purpose behind sympathetic embarrassment? | askscience | {
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"[Mirror Neurons?](_URL_0_) Empathy is a useful adaptation for social animals.",
"[This is a pretty great video by RSA Animate about it, and I'm pretty sure it covers mirror neurons in it.](_URL_1_)",
"I... | {
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} | What's the purpose behind sympathetic embarrassment?
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1f5hnk | If i flipped a coin from the top of, say, The Empire State Building, in a perfect environment would it continue spinning all the way down to the bottom? Would it stabilize? Would the rate of spinning increase? | Wondering if eventually it would stabilize itself and fall flat or vertically, or just keep spinning. | askscience | {
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Wondering if eventually it would stabilize itself and fall flat or vertically, or just keep spinning. | [
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50suy3 | AskScience AMA Series: I'm Dr. Carin Bondar with all you ever wanted to know about animal mating and my book, "Wild Sex". Ask Me Anything! | Dr. Carin Bondar is the author of [Wild Sex: The Science Behind Mating in the Animal Kingdom](_URL_0_), just published Pegasus Books. She received a PhD in population ecology from the University of British Columbia and has since hosted a variety of online and television programs, working with Scientific American, Natio... | askscience | {
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} | AskScience AMA Series: I'm Dr. Carin Bondar with all you ever wanted to know about animal mating and my book, "Wild Sex". Ask Me Anything!
Dr. Carin Bondar is the author of [Wild Sex: The Science Behind Mating in the Animal Kingdom](_URL_0_), just published Pegasus Books. She received a PhD in population ecology from t... | [
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k9p7f | Another question from my 10-year-old son. Could there be such a thing as a "full stop" in space? What would really happen when Capt. Picard gave that order? | I'm being a good mom and watching Star Trek: TNG on Netflix with my son. The Enterprise often comes to a "full stop" in space. But can anything really "stop" in space?
Nevermind the other 1,000 questions he has about Star Trek science! This is tonight's :)
(His name is Ben and I'm letting him read this conversation a... | askscience | {
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"One of the underpinnings of [special relativity](_URL_0_) and, in turn, all of modern physics, is that there's no such thing as an absolute frame of rest. Let's say you're in a train with closed windows moving at a constant v... | {
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"url": [
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} | Another question from my 10-year-old son. Could there be such a thing as a "full stop" in space? What would really happen when Capt. Picard gave that order?
I'm being a good mom and watching Star Trek: TNG on Netflix with my son. The Enterprise often comes to a "full stop" in space. But can anything really "stop" in sp... | [
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kzbpn | Is there something genetically particular about Canis lupus familiaris that allows the breeds to vary so widely in size? | Cats have been divided into distinct breeds, too, but they're all about the same size. Is that simply because they weren't selected for size, but for coat an other appearance features? Is it reasonable to believe that we could breed "toy" house cats and lion-sized house cats if we wanted to?
Would it be reasonable t... | askscience | {
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"Yes, there is. No, we d... | {
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"http://genomebiology.com/2011/12/2/216/abstract",
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... | Is there something genetically particular about Canis lupus familiaris that allows the breeds to vary so widely in size?
Cats have been divided into distinct breeds, too, but they're all about the same size. Is that simply because they weren't selected for size, but for coat an other appearance features? Is it reasonab... | [
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3uuifl | Would it be any dangerous at all to split even one atom? | How many atoms would you have to split to for example take out everyone in a 1 meter radius?
I remember a SciShow video that said something along the lines of splitting the atoms in a log would would take out a whole city, but there's billions of atoms in one.
Edit: I'm aware that it's gonna be hard to calculate exac... | askscience | {
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} | Would it be any dangerous at all to split even one atom?
How many atoms would you have to split to for example take out everyone in a 1 meter radius? I remember a SciShow video that said something along the lines of splitting the atoms in a log would would take out a whole city, but there's billions of atoms in one. Ed... | [
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1ee2go | Inspired by SimCity on Super Nintendo: Could the US be powered by many nuclear power plants in one central location, such as Kansas or Nebraska? | Where there isn't a major threat of earthquake or hurricane?
Or do power plants need to be spaced closer to the cities they are powering? | askscience | {
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} | Inspired by SimCity on Super Nintendo: Could the US be powered by many nuclear power plants in one central location, such as Kansas or Nebraska?
Where there isn't a major threat of earthquake or hurricane? Or do power plants need to be spaced closer to the cities they are powering? | [
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1ey7we | Why is there a gap between the intake and body of modern fighter jets? | If you look at [this picture](_URL_0_), you can see that the F-15 and F-22 have a gap in between the main body and the engine intakes, but not on the F-4. What does that provide? | askscience | {
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} | Why is there a gap between the intake and body of modern fighter jets?
If you look at [this picture](_URL_0_), you can see that the F-15 and F-22 have a gap in between the main body and the engine intakes, but not on the F-4. What does that provide? | [
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13jrrh | How are the forces exerted on the human back by carrying a heavy object different from those exerted by unsupported breasts? And how does a bra redistribute force to relieve back pain/damage? [possibly NSFW] [x-post from r/AskEngineers] | **edit. Current Answers of Note, 14 hours after original post:**
*(A work in progress. More answers/clarification are still needed, PARTICULARLY on force analyses!)*
**Why do women's backs not grow strong enough over time to support the weight of their breasts? Why are specific back-strengthening exercises necessary?... | askscience | {
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"All of this information is very interesting, but there is one point I would like to quibbl... | {
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"http://www.thinktankphoto.com/product-images/xlarge/Feature-Rotation-360-15.jpg",
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} | How are the forces exerted on the human back by carrying a heavy object different from those exerted by unsupported breasts? And how does a bra redistribute force to relieve back pain/damage? [possibly NSFW] [x-post from r/AskEngineers]
**edit. Current Answers of Note, 14 hours after original post:** *(A work in progre... | [
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bcdk88 | Are the nearby airplanes cleared of the sky when launching Falcon Heavy? I was checking Flightradar24 when launch occurred and didn't see any difference. Also, 3 boosters landed back successfully. I assume the sky has to be clear of airplanes to avoid any potential collision? | EDIT:
Wow, THANK YOU for gold kind stranger! | askscience | {
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EDIT: Wow, THANK YOU for gold kind stranger... | [
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k3k1o | Suppose I were to travel back in time 2,000 years. How well would modern vaccines protect me from the pre-modern diseases? | In those 2,000 years, thousands of generations of microbial evolution have taken place, but to what extent would that reduce the efficacy of modern vaccines? Clearly with some diseases there is a pretty broad range of immunity, as illustrated by the fact infection with *Vaccinia* yields immunity to the related virus *... | askscience | {
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} | Suppose I were to travel back in time 2,000 years. How well would modern vaccines protect me from the pre-modern diseases?
In those 2,000 years, thousands of generations of microbial evolution have taken place, but to what extent would that reduce the efficacy of modern vaccines? Clearly with some diseases there is a p... | [
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1kok2f | How high could you get on a giant swing? | I have seen some giant swings in german tv adverts recently and asked myself if it were possible to reach the same degree of slant as on a small conventional swing.
[Imgur](_URL_2_)
[Imgur](_URL_3_)
Here are the full advertisings:
[Yogurette](_URL_0_)
[Einhell](_URL_1_) | askscience | {
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I have seen some giant swings in german tv adverts recently and asked myself if it were possible to reach the same degree of slant as on a small conventional swing. [Imgur](_URL_2_) [Imgur](_URL_3_) Here are the full advertisings: [Yogurette](_URL_0_) [Einhell](_URL_1_) | [
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mdrqp | Would it make sense to do away with the Latin phrasing of scientific terms? | It reminds me of how the bible used to only be written and read in Latin. This was a deliberate and malicious attempt to keep the common folk from grasping it, leaving them dependent on the clergy. Science, if I am not mistaken, does not have the same aversion towards people learning about it and criticizing it.
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} | Would it make sense to do away with the Latin phrasing of scientific terms?
It reminds me of how the bible used to only be written and read in Latin. This was a deliberate and malicious attempt to keep the common folk from grasping it, leaving them dependent on the clergy. Science, if I am not mistaken, does not have t... | [
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4otsf7 | Why are supercomputers measured in flops instead of hertz? | askscience | {
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kq793 | Physics problem that has been plaguing me since high school. | Hypothetical situation. Lets say you have a fighter airplane that flies at a maximum velocity of (just throwing numbers out there) 100 m/s. This plane can fire missiles, which travel at 200m/s. If the plane is flying at 100m/s and fires the missiles, the missiles would travel faster than 200m/s, right?
Ok. So what ... | askscience | {
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} | Physics problem that has been plaguing me since high school.
Hypothetical situation. Lets say you have a fighter airplane that flies at a maximum velocity of (just throwing numbers out there) 100 m/s. This plane can fire missiles, which travel at 200m/s. If the plane is flying at 100m/s and fires the missiles, the miss... | [
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p2sh8 | YOU are finalists for the Best Big Community of 2011! | For anyone not already aware, [AskScience is a finalist for the Best Big Community of 2011!](_URL_1_) We've seen a ton of change here in the past year, and it has been driven by YOU: the people asking questions, the people answering them, and the rest who are voting to keep the signal-to-noise ratio so high. The mode... | askscience | {
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For anyone not already aware, [AskScience is a finalist for the Best Big Community of 2011!](_URL_1_) We've seen a ton of change here in the past year, and it has been driven by YOU: the people asking questions, the people answering them, and the rest who are voting... | [
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7uqu0s | AskScience AMA Series: "I am Rhett Allain, physicist and technical consultant on Mythbusters and MacGyver. Ask me about the physics of pretty much anything! | Hi r/AskScience. I'm Rhett Allain, a physics professor at Southeastern Louisiana University and writer of the [Dot Physics](_URL_2_) column at WIRED, where I dissect the physics of everything from viral videos like the [Invisible Box Challenge](_URL_0_), to the (often flawed) science in TV shows and movies like '[Stran... | askscience | {
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} | AskScience AMA Series: "I am Rhett Allain, physicist and technical consultant on Mythbusters and MacGyver. Ask me about the physics of pretty much anything!
Hi r/AskScience. I'm Rhett Allain, a physics professor at Southeastern Louisiana University and writer of the [Dot Physics](_URL_2_) column at WIRED, where I disse... | [
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1c7zah | What the continuous function increases at the greatest rate? What function in general increases at the greatest rate? | I had this on my mind for a while. In my calc class, we went over a hierarchy of increasing functions (as in, which functions increase faster than others) For example, of the functions we've been taught, ln(x) (or log functions in general) increases the slowest, followed x^(1/n), x^n, a^x, n!, x^x. After reaching the... | askscience | {
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"https://en.wikipedia.org/wiki/Computable_function",
"https://en.wikipedia.org/wiki/Busy_beaver#The_busy_beaver_functi... | What the continuous function increases at the greatest rate? What function in general increases at the greatest rate?
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qh6kv | I've been seeing this image on Facebook about the "horrible effects of cold water" and I think it's BS. Is this really true? | Here's the image: _URL_0_
It makes absolutely no sense to me but I've been seeing it EVERYWHERE. Can anyone prove or disprove the statements in this picture? I'm not so sure about the heart attack facts but I think the cold water facts are faulty science. | askscience | {
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"http://pharmacy.unc.edu/research/labs/laboratory-of-dru... | I've been seeing this image on Facebook about the "horrible effects of cold water" and I think it's BS. Is this really true?
Here's the image: _URL_0_ It makes absolutely no sense to me but I've been seeing it EVERYWHERE. Can anyone prove or disprove the statements in this picture? I'm not so sure about the heart attac... | [
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1d0s58 | Is time of death hereditary? | I'm just curious to see if anything is known of age of death being heredity. Is the age a parent or both parents or a grandparent or both grandparents die a good indicator of how long the descendant will live? | askscience | {
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I'm just curious to see if anything is known of age of death being heredity. Is the age a parent or both parents or a grandparent or both grandparents die a good indicator of how long the descendant will live? | [
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x2irt | Why are 100m athletes built like tanks in upper body? | I was watching the BBC documentary on bolt and saw yohan blake and remembered that other famous sprinters on 100m are built like tanks(not all but many) i know that you need explosive force for this kind of competition but i guess it should limited to lower body in general.I also guess that they must train every part w... | askscience | {
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I was watching the BBC documentary on bolt and saw yohan blake and remembered that other famous sprinters on 100m are built like tanks(not all but many) i know that you need explosive force for this kind of competition but i guess it should limited to lower body in ... | [
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1aqiwx | What's the significance of the Planck mission results? | The Planck mission has just released its [results](_URL_0_) I'm especially curious about the new value of the Hubble constant. At 67,15 ± 1,2 (km/s)/Mpc , this puts it outside of the range of the WMAP mission: 69,32 ± 0,80(km/s)/Mpc (the highest value from Planck would be 68,35 and the lowest from WMAP 68,52, so a gap ... | askscience | {
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} | {
"url": [
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"http://www.nasa.gov/images/content/735692main_pia16874-43_946-710.jpg",
"http://photojournal.jpl.nasa.gov/ipbrowse/PIA16879_ip.jpg",
"http://w... | What's the significance of the Planck mission results?
The Planck mission has just released its [results](_URL_0_) I'm especially curious about the new value of the Hubble constant. At 67,15 ± 1,2 (km/s)/Mpc , this puts it outside of the range of the WMAP mission: 69,32 ± 0,80(km/s)/Mpc (the highest value from Planck w... | [
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j90rx | Why do domestic dogs fetch random toys... Like over and over and over again? | askscience | {
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"retrievers and many other dogs were bred to do this to be useful in hunting",
"because the owner gives a positive response; treats,... | {
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"url": []
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} | Why do domestic dogs fetch random toys... Like over and over and over again?
| [
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2xbts4 | Is it possible to go from coast to coast of the United States traveling only by waterways? (rivers, creeks, lakes etc) | I came across a very cool visualization of all the waterways in the United States courtesy of **[this website](_URL_0_)**. The more you zoom in on a specific area of the country, the more it refreshes revealing the intricacies of that land's waterways.
Anyway, this got me thinking about whether or not it would be poss... | askscience | {
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"If by \"traveling only waterways,\" you include walking in creeks to keep your feet wet, then the only significant problem would be getting over the continental divide. You would have to find some waterway near it that splits into two distr... | {
"url": []
} | {
"url": [
"http://www.somebits.com/rivers/rivers-polymaps.html#5.00/39.754/-100.598"
]
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"url": [
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"http://en.wikipedia.org/wiki/Two_Ocean_Pass",
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"https://www.reddit.com/r/MapPorn/comments/23juqb/the_river_connecting_two_oceans_a_creek_in/"
]
} | Is it possible to go from coast to coast of the United States traveling only by waterways? (rivers, creeks, lakes etc)
I came across a very cool visualization of all the waterways in the United States courtesy of **[this website](_URL_0_)**. The more you zoom in on a specific area of the country, the more it refreshes ... | [
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37c9ci | My 4 year old wants to know: Why do magnetic fields exist? | askscience | {
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"Kids usually learn better when they can see and touch things, so I'd do it as an experiment. Get a battery, some anti-tarnish coated (not insulated, the kind with a wax coating) wi... | {
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} | {
"url": []
} | {
"url": [
"http://miniscience.com/kits/Magnet_Motor_kit/Magnet_Motor_LL.jpg",
"https://www.youtube.com/watch?v=MO0r930Sn_8",
"http://en.m.wikipedia.org/wiki/Gravitoelectromagnetism"
]
} | My 4 year old wants to know: Why do magnetic fields exist?
| [
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2e2ixq | How does using water irresponsibly remove it from the water cycle? | I keep hearing about how we are wasting water and that it is a limited recourse. How is it possible, given the water cycle will reuse any water we use? | askscience | {
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"url": [
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"http://abcnews.go.com/US/wireStory/water-headed-struggling-lake-mead-24970586",
"http://ca.water.usgs.gov/projects/central-valley/land-subsidence-monitoring-network.html"
]
} | How does using water irresponsibly remove it from the water cycle?
I keep hearing about how we are wasting water and that it is a limited recourse. How is it possible, given the water cycle will reuse any water we use? | [
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1pl51f | Does it take more energy in transmitting electricity uphill than it does downhill? Is the loss during transmission more in one of the two directions? | askscience | {
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"Very, very small difference, so small because gravity is so much weaker than electricity. An electron going through a potential of one volt is a convenient measure of energy called an electron-volt (equivalent to ~10^-19 Joules). An electro... | {
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"url": []
} | Does it take more energy in transmitting electricity uphill than it does downhill? Is the loss during transmission more in one of the two directions?
| [
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1eqoes | If you split me in half along the Sagittal plane, which side would "I" be on? | askscience | {
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"Research indicates that the [right frontal lobe](_URL_0_) is likely where our \"sense of self\" is centered, so for the last two or three seconds of your life your right half would be more \"you\" than your left.",
"When Sperry did his ... | {
"url": []
} | {
"url": []
} | {
"url": [
"https://www.scientificamerican.com/article.cfm?id=study-suggests-where-sens",
"http://www.nobelprize.org/educational/medicine/split-brain/background.html",
"http://en.wikipedia.org/wiki/Phineas_Gage"
]
} | If you split me in half along the Sagittal plane, which side would "I" be on?
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l8e08 | People have survived for years on extremely limited diets (POW's for example). When I read about the substances required for all the complex processes of our bodies, I wonder how this is even possible? | Obviously people on starvation diets lose weight, have little energy etc., but what about something as basic as cell replication? If you aren't getting the nutrients that are the building blocks of new cells, in the heart for example, it doesn't seem possible you could survive long. And nerve transmission, doesn't that... | askscience | {
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"A lot of these people *don't* survive. If you don't get enough of an essential nutrient, you eventually die.\n\nAnd that sad reality is that the people who run these sorts of camps, through trial and error, figure out exactl... | {
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"url": []
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"url": [
"http://en.wikipedia.org/wiki/Potato",
"nutritiondata.com",
"http://en.wikipedia.org/wiki/Potassium"
]
} | People have survived for years on extremely limited diets (POW's for example). When I read about the substances required for all the complex processes of our bodies, I wonder how this is even possible?
Obviously people on starvation diets lose weight, have little energy etc., but what about something as basic as cell r... | [
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10us7l | If a pattern of 100100100100100100... repeats infinitely, are there more zeros than ones? | askscience | {
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... | {
"url": []
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"url": []
} | {
"url": [
"http://www.reddit.com/r/askscience/comments/10us7l/if_a_pattern_of_100100100100100100_repeats/c6gubfg",
"http://en.wikipedia.org/wiki/Aleph_number#Aleph-naught",
"http://en.wikipedia.org/wiki/Limit_(mathematics)#Limit_of_a_sequence",
"http://en.wikipedia.org/wiki/Sequence",
"http://www... | If a pattern of 100100100100100100... repeats infinitely, are there more zeros than ones?
| [
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528ynh | How Well Do Giraffe Species Interbreed? | Part of the reason given why their identification as 4 species was not noticed is ability of giraffes to Interbreed. How successful are progeny?
Bonus: Could interbreeding be used to aid in conservation efforts, by introducing more diversity into depopulated a giraffe species? | askscience | {
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"There is an article I dug out on the [Smithsonian website](_URL_1_). It appears when in captivity they do cross mate regularly and have no problem producing hybrid offspring. \n\nIn the wild though, it appears they do not cro... | {
"url": []
} | {
"url": []
} | {
"url": [
"http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0077191",
"http://www.smithsonianmag.com/science-nature/weather-prevents-different-giraffe-species-from-interbreeding-4766316/?no-ist"
]
} | How Well Do Giraffe Species Interbreed?
Part of the reason given why their identification as 4 species was not noticed is ability of giraffes to Interbreed. How successful are progeny? Bonus: Could interbreeding be used to aid in conservation efforts, by introducing more diversity into depopulated a giraffe species? | [
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4l8emh | What are first principles? | So, I'm a simple engineer and had a conversation with a physicist a few hours ago. During the conversation he uttered the sentence "...and of course from first principles we can say...", while I just nodded my head.
Nobody called my bluff while I was faking it until I made it to google, which was of no help. Apparent... | askscience | {
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"It's not rigidly defined, but typically it involves making an argument from the simplest concepts available, that everyone agrees to be true without additional assumptions, like conservation of energy and momentum.\n\nWikiped... | {
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} | {
"url": []
} | {
"url": [
"https://en.wikipedia.org/wiki/First_principle",
"https://en.wikipedia.org/wiki/Ab_initio"
]
} | What are first principles?
So, I'm a simple engineer and had a conversation with a physicist a few hours ago. During the conversation he uttered the sentence "...and of course from first principles we can say...", while I just nodded my head. Nobody called my bluff while I was faking it until I made it to google, which... | [
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1ntjsf | Is Neil Armstrong's first foot print still on the Moon or have forces and events removed it? | I have written a blog post about this for my site below which gives my uneducated understanding, but would love to hear fellow Redditors views.
_URL_0_ | askscience | {
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"> The biggest question for me that I do not have the answer is how careful were the astronauts when leaving and re-entering the Eagle lunar lander to make sure that Neil Armstrong's first footprint was not damaged.\n\nThey weren't careful a... | {
"url": []
} | {
"url": [
"http://www.magnifiscience.com/blogs/news/9434519-is-neil-armstrongs-footprint-still-on-the-moon"
]
} | {
"url": [
"http://upload.wikimedia.org/wikipedia/commons/1/19/Apollo11-LRO-March2012.jpg",
"http://boards.straightdope.com/sdmb/showthread.php?t=127681"
]
} | Is Neil Armstrong's first foot print still on the Moon or have forces and events removed it?
I have written a blog post about this for my site below which gives my uneducated understanding, but would love to hear fellow Redditors views. _URL_0_ | [
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1h40hj | Is Malthus's hypothesis of the global carrying capacity legitimate? | In my opinion, I believe that the human race reacts to limiting factors much like viruses breed in protection against vaccines; the human race's pursuit of constant adaptation will eventually lead to extremely effective solutions to these limiting factors. However, I also believe that this process will indefinitely rep... | askscience | {
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"Malthusian hypothesis was legitimate in his lifetime. Pre-industrial populations behave just like Malthus predicted. He was essentially correct in his observation. However, technological developments already happening in ... | {
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} | {
"url": []
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"url": [
"http://www.inf.ethz.ch/~fcellier/Pres/AGS_07.ppt"
]
} | Is Malthus's hypothesis of the global carrying capacity legitimate?
In my opinion, I believe that the human race reacts to limiting factors much like viruses breed in protection against vaccines; the human race's pursuit of constant adaptation will eventually lead to extremely effective solutions to these limiting fact... | [
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3yk3kd | How do you calculate load distribution on an uneven beam? | If a beam is supported at either end, but one end is higher, is it correct that the lower end will bear more weight? How would the load difference at the two points be calculated?
| askscience | {
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"You have three things that all have to equal zero for the beam to stay put: horizontal forces, vertical forces, and moment/torque (with respect to any convenient axis of your choice). Horizontal forces are just reaction forc... | {
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} | {
"url": []
} | {
"url": [
"http://moorepants.github.io/dissertation/_images/beam.png"
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} | How do you calculate load distribution on an uneven beam?
If a beam is supported at either end, but one end is higher, is it correct that the lower end will bear more weight? How would the load difference at the two points be calculated? | [
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6c7cxb | Why isn't there a 50% chance for 3 flipped coins to all land on the same side? | I know this might seem like a dumb question, but here's my logic;
'When you flip 3 coins, at least 2 of them are guaranteed to land on the same side, so surely the other coin has a 50% chance of landing on the same side as the other two.'
Now, we can tell from flipping 3 coins several times, that this is probably an ... | askscience | {
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"Here are all the possible results:\n\nHHH, HHT, HTH, THH, HTT, THT, TTH, TTT.\n\nThere are 8 possibilities, and 2 of them have all three coins being the same. Since all of these outcomes are equa... | {
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} | Why isn't there a 50% chance for 3 flipped coins to all land on the same side?
I know this might seem like a dumb question, but here's my logic; 'When you flip 3 coins, at least 2 of them are guaranteed to land on the same side, so surely the other coin has a 50% chance of landing on the same side as the other two.' No... | [
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v3quo | Why the standard system to measure time is not in base 10? | When measuring time, the base used is not uniform and varies from base 60 (60 seconds in a minute, 60 minutes in a hour), to base 12 (12 months in a year) and so on. Would it be far easier to have a metric, base 10 system for measuring time? What are the advantages of the current one? | askscience | {
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"> Before mechanical clocks\n > The Egyptians subdivided daytime and nighttime into twelve hours each since at least 2000 BC, hence the seasonal variation of their hours. The Hellenistic astronomers Hipparchus (... | {
"url": []
} | {
"url": []
} | {
"url": [
"http://en.wikipedia.org/wiki/Second#Before_mechanical_clocks",
"http://en.wikipedia.org/wiki/SI_base_unit",
"http://en.wikipedia.org/wiki/French_Republican_Calendar#Decimal_time"
]
} | Why the standard system to measure time is not in base 10?
When measuring time, the base used is not uniform and varies from base 60 (60 seconds in a minute, 60 minutes in a hour), to base 12 (12 months in a year) and so on. Would it be far easier to have a metric, base 10 system for measuring time? What are the advant... | [
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sygw6 | Is there any truth to "According to physics a bumblebee shouldn't be able to fly". | I've heard this saying quite a few times in my life and to be quite honest I never quite understood how it could be true; however, I'm no physicist nor am I an entomologist so I figure it would be worth asking.
Furthermore if the statement is false how did this idea come about and why has it become wide spread? | askscience | {
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"url": []
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"http://www.straightdope.com/columns/read/1076/is-it-aerodynamically-impossible-for-bumblebees-to-fly",
"http://en.wikipedia.org/wiki/List_of_common_misconceptions#Biology"
]
} | Is there any truth to "According to physics a bumblebee shouldn't be able to fly".
I've heard this saying quite a few times in my life and to be quite honest I never quite understood how it could be true; however, I'm no physicist nor am I an entomologist so I figure it would be worth asking. Furthermore if the stateme... | [
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3ss33j | What causes this ring of fire from a Desert Eagle? *Link in description* (x-post r/woahdude) | _URL_0_ | askscience | {
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4ivc04 | Ask Anything Wednesday - Engineering, Mathematics, Computer Science | Welcome to our weekly feature, Ask Anything Wednesday - this week we are focusing on **Engineering, Mathematics, Computer Science**
Do you have a question within these topics you weren't sure was worth submitting? Is something a bit too speculative for a typical /r/AskScience post? No question is too big or small for ... | askscience | {
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"http://www.reddit.com/r/askscience/wiki/index#wiki_answering_askscience",
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"url": []
} | Ask Anything Wednesday - Engineering, Mathematics, Computer Science
Welcome to our weekly feature, Ask Anything Wednesday - this week we are focusing on **Engineering, Mathematics, Computer Science** Do you have a question within these topics you weren't sure was worth submitting? Is something a bit too speculative for... | [
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6c391u | What is the cause of diffusion and osmosis? How does it work? | I know the general gist of how diffusion/osmosis works, I just don't know *why* it works like it works. | askscience | {
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5inrn5 | Is it possible that creatures very similar to those currently extint come to exist again in a very distant future? (through evolution) | askscience | {
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22vwdm | What constant driving force is behind Ohm's Law? | I'm coming from a chemistry standpoint and I'm wondering what constant driving force is behind the Ohm's Law model of EMF, resistance, and current (assume DC here, as from a chemical battery). I don't like the analogy that, say, a 9V battery "tries" to provide 9V, but if the load between the terminals is small enough,... | askscience | {
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"http://en.wikipedia.org/wiki/Internal_resistance",
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} | What constant driving force is behind Ohm's Law?
I'm coming from a chemistry standpoint and I'm wondering what constant driving force is behind the Ohm's Law model of EMF, resistance, and current (assume DC here, as from a chemical battery). I don't like the analogy that, say, a 9V battery "tries" to provide 9V, but if... | [
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1coxwp | With recent events, I'm curious to how K9 sniff out bombs? | What are the dogs trained to smell, what component produces a distinguishing smell? | askscience | {
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} | With recent events, I'm curious to how K9 sniff out bombs?
What are the dogs trained to smell, what component produces a distinguishing smell? | [
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73edx6 | if we ever run out of copper, for ecample for cables, what's our best bet in terms of price and availability? | askscience | {
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} | if we ever run out of copper, for ecample for cables, what's our best bet in terms of price and availability?
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1ah1ll | Is it possible to predict the chemical properties (density, phase, etc.) of a substance only from the molecular composition? | A question similar to this was posted a year ago, but there was only one top level comment and it was a bit vague. Hope it's okay that I posted this.
So assuming it is theoretically possible, are we at the level that we can accurately predict the properties (melting and boiling point, specific heat, density, volatilit... | askscience | {
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"url": [
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} | Is it possible to predict the chemical properties (density, phase, etc.) of a substance only from the molecular composition?
A question similar to this was posted a year ago, but there was only one top level comment and it was a bit vague. Hope it's okay that I posted this. So assuming it is theoretically possible, are... | [
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kinca | If I could travel back to the time of the velociraptor. Would the atmosphere composition and temperature on Earth kill me before the velociraptor did? | askscience | {
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} | If I could travel back to the time of the velociraptor. Would the atmosphere composition and temperature on Earth kill me before the velociraptor did?
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4wqaw3 | Why is the critical point in temperature/pressure? | H2O has it's critical point at 647,3°K and 218 bar
What does that mean? | askscience | {
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"url": [
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} | Why is the critical point in temperature/pressure?
H2O has it's critical point at 647,3°K and 218 bar What does that mean? | [
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ke5zv | Are there any cyclopsian animals? | I was thinking about this today. It's probably an easy answer so I'll extend my question as well. But every single animal I can think of that has evolved some form of optical apparatus - well, they all have two eyes. Obviously in a three dimensional space, having depth of vision is a very important and beneficial attri... | askscience | {
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"> can we trace having two eyes back to a pre-land ancestor?\n\nYes. Double eyes pretty much evolved naturally as a consequence of most animals being [bilaterians](_URL_1_) and thus their development plan naturally allowes two copies of stuf... | {
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"http://en.wikipedia.org/wiki/Copepod",
"http://en.wikipedia.org/wiki/Evolution_of_the_eye",
"http://en.wikipedia.org/wiki/Opsin"
]
} | Are there any cyclopsian animals?
I was thinking about this today. It's probably an easy answer so I'll extend my question as well. But every single animal I can think of that has evolved some form of optical apparatus - well, they all have two eyes. Obviously in a three dimensional space, having depth of vision is a v... | [
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1dd5vh | Would it be possible to build a lava boat that is able to carry passengers with current technology? | Engineering Question:
Would it be possible to construct a boat with today's technologies that would be able to carry human passengers across a sea of molten rock without destroying the boat or killing the passengers?
Would the molten rock freeze to the bottom of the boat and progressively make it heavier and heavie... | askscience | {
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"I don't think I can give you a complete answer but I can at least point out why it would be really difficult:\n\n* The first problem with being on lava is that it is really hot, this would induce [creep](_URL_0_) on your hull... | {
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} | {
"url": []
} | {
"url": [
"http://en.wikipedia.org/wiki/Creep_\\(deformation\\)",
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]
} | Would it be possible to build a lava boat that is able to carry passengers with current technology?
Engineering Question: Would it be possible to construct a boat with today's technologies that would be able to carry human passengers across a sea of molten rock without destroying the boat or killing the passengers? Wou... | [
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1ddut8 | What collapses a wave function? | I attempted to understand the double slit experiment and came across [this video](_URL_0_). In the video the presenter says that when they attempted to observe which slit the photon went in to it collapsed the wave function and the photon acted as a particle. Fine. He says they then turned the observation machine on ta... | askscience | {
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"> He said that a conscious observation was needed to collapse the wave function.\n\nThis is complete and utter bullshit that is propagated by people who are entirely talking out of their ass. It is simply an interaction betw... | {
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} | {
"url": [
"http://www.youtube.com/watch?v=LW6Mq352f0E"
]
} | {
"url": []
} | What collapses a wave function?
I attempted to understand the double slit experiment and came across [this video](_URL_0_). In the video the presenter says that when they attempted to observe which slit the photon went in to it collapsed the wave function and the photon acted as a particle. Fine. He says they then turn... | [
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wzbvb | What is the most ideal human height from a health/longevity point of view? Both Gigantism and Darwarfism patients suffer from various cardiovascular/health problems, what is the most precise ideal height we know of? | askscience | {
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"There are some things that should be clarified here. Abnormal height, either tall or short, is an *indicator* of adverse health risks, but doesn't necessarily mean a person is unhe... | {
"url": []
} | {
"url": []
} | {
"url": [
"http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1071721/?tool=pmcentrez",
"http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1071721/table/tbl1/",
"http://eurheartj.oxfordjournals.org/content/31/14/1802/F3.large.jpg",
"http://www.ncbi.nlm.nih.gov/pubmed/20530501"
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} | What is the most ideal human height from a health/longevity point of view? Both Gigantism and Darwarfism patients suffer from various cardiovascular/health problems, what is the most precise ideal height we know of?
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6h196y | In a documentary about the Manhattan Project I recently viewed (I don't recall the name of it, I apologize), some of the scientists expressed their concern about the "atmosphere exploding" and destroying the Earth during the Trinity test. What scientific basis did they have for this speculation? | askscience | {
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"text": [
"Supposedly there's a quote (although I can't find it) about one of the scientists who was asked to check the calculations to verify that the nuclear bomb wouldn't ignite the atmosphere. He expressed his concern to another sc... | {
"url": []
} | {
"url": []
} | {
"url": [
"https://blogs.scientificamerican.com/cross-check/bethe-teller-trinity-and-the-end-of-earth/"
]
} | In a documentary about the Manhattan Project I recently viewed (I don't recall the name of it, I apologize), some of the scientists expressed their concern about the "atmosphere exploding" and destroying the Earth during the Trinity test. What scientific basis did they have for this speculation?
| [
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jx2p4 | What are some of the controversies within the field of
evolutionary biology? | I understand the theory of evolution pretty well, however, I received a prompt in my drawing class about drawing something I dislike, but making it look appealing. As such, I decided to go the route of making a drawing about "teaching the controversy" but rather than the evolution vs. creationism thingy (not worthy of ... | askscience | {
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"The [neutralist-selectionist debate](_URL_2_) is a good example.\n\n[Group selection and multi level selection theory](_URL_0_) are also extremely controversial at the moment. The majority of the field is sticking with the orthodox [kin sel... | {
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} | What are some of the controversies within the field of evolutionary biology?
I understand the theory of evolution pretty well, however, I received a prompt in my drawing class about drawing something I dislike, but making it look appealing. As such, I decided to go the route of making a drawing about "teaching the cont... | [
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1nderk | Why is space in the Cassini "Pale Blue Dot" picture bluish instead of black? | [The beautiful Cassini "Pale Blue Dot" picture](_URL_0_) is a marvel, but it does leave me with the question: why is the empty space there bluish instead of pitch black? and while we are at it, why is the outermost ring a very bright purple while the rest are varying shades of brown? | askscience | {
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"http://farm9.staticflickr.com/8483/8285714929_54f4ccfc2d_b.jpg",
"http://upload.wikimedi... | Why is space in the Cassini "Pale Blue Dot" picture bluish instead of black?
[The beautiful Cassini "Pale Blue Dot" picture](_URL_0_) is a marvel, but it does leave me with the question: why is the empty space there bluish instead of pitch black? and while we are at it, why is the outermost ring a very bright purple wh... | [
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1wwtp1 | Can people with anorexia identify their anonymised body? | There's the common illustration of someone with anorexia looking at a mirror and seeing themselves as fatter than they actually are.
Does their body dysmorphia only happen to themselves when they know it's their own body?
Or if you anonymise their body and put it amongst other bodies, would they see their body as it... | askscience | {
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"http://www.plosone.org/article/info:doi/10.1371/journal.pone.0064602",
"http://www.sidran.org... | Can people with anorexia identify their anonymised body?
There's the common illustration of someone with anorexia looking at a mirror and seeing themselves as fatter than they actually are. Does their body dysmorphia only happen to themselves when they know it's their own body? Or if you anonymise their body and put it... | [
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zco6c | Is there anything in "The Origin of Species that isn't (or is no longer considered) accurate?" | I got a Kindle and was excited to see older publications available for free through Amazon. I picked up Charles Darwin's "On the Origin of Species By Means of Natural Selection, or, the Preservation of Favoured Races in the Struggle for Life" and have begun reading it. First, I'm fascinated by the fact that it reads mo... | askscience | {
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"http://en.wikipedia.org/wiki/Evo-devo",
"http://en.wikipedia.org/wiki/Epigenetics",
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I got a Kindle and was excited to see older publications available for free through Amazon. I picked up Charles Darwin's "On the Origin of Species By Means of Natural Selection, or, the Preservation of Favoured Races in the S... | [
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2iutms | FAQ Friday: Ask your questions about the Ebola epidemic here! | There are many questions surrounding the ongoing Ebola crisis, and at /r/AskScience we would like to do our part to offer accurate information about the many aspects of this outbreak. **Our experts will be here to answer your questions, including:**
- The illness itself
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- The active survei... | askscience | {
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} | FAQ Friday: Ask your questions about the Ebola epidemic here!
There are many questions surrounding the ongoing Ebola crisis, and at /r/AskScience we would like to do our part to offer accurate information about the many aspects of this outbreak. **Our experts will be here to answer your questions, including:** - The il... | [
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3mpvnc | Why isn't all the water on Earth absorbed into it? | Given the amount of soft materials, holes, cracks, etc of the planet's surface, why do we still have oceans, lakes, etc? | askscience | {
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2bomn6 | Why is economical growth necessary in a rich country? | I am an environmental scientist/manager living in a rich country (Germany). There is a strong believe among my peers that we should just stop growing for the sake of the environment and work for subsistence alone because if there continues to be as much as there is now we got enough for everyone.
Would it be possible ... | askscience | {
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} | Why is economical growth necessary in a rich country?
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3atkgf | AskScience AMA Series: I am tvw and the structure of the Milky Way. Ask Me Anything! | I am a graduate student at the University of Virginia and the National Radio Astronomy Observatory studying the structure of our galaxy, the Milky Way. Specifically, I use some of the largest telescopes in the world (the Green Bank Telescope (WV, USA), the Arecibo Telescope (Puerto Rico), and the Very Large Array (NM, ... | askscience | {
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"url": [
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} | AskScience AMA Series: I am tvw and the structure of the Milky Way. Ask Me Anything!
I am a graduate student at the University of Virginia and the National Radio Astronomy Observatory studying the structure of our galaxy, the Milky Way. Specifically, I use some of the largest telescopes in the world (the Green Bank Tel... | [
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wlj50 | Why are autistic people drawn to water? Ex1: A hiker was recently rescued because a searcher had heard autistic people are drawn to water. They found him in a river. Ex2:Drowning is a leading cause of death in people with autism. | askscience | {
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vdve5 | [Weekly Discussion Thread] Scientists, do you use the scientific method? | This is the sixth installment of the weekly discussion thread. Today's topic was a suggestion from an AS reader.
Topic (Quoting from suggestion): Hi scientists. This isn't a very targeted question, but I'm told that the contemporary practice of science ("hard" science for the purposes of this question) doesn't utilize... | askscience | {
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"url": []
} | [Weekly Discussion Thread] Scientists, do you use the scientific method?
This is the sixth installment of the weekly discussion thread. Today's topic was a suggestion from an AS reader. Topic (Quoting from suggestion): Hi scientists. This isn't a very targeted question, but I'm told that the contemporary practice of sc... | [
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8mwjt0 | Why is forming a chemical bond described as exothermic, whilst it appears to be endothermic? | Little bit of background info: Currently I study UK A-Level Chemistry and physics, so please don't expect too much.
Recently, when studying energetics (enthalpy changes, bonding, etc.) I noticed what appeared to be contradicting statements.
For chemical bonding, in terms of energetics, we are taught exclusively that ... | askscience | {
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"https://i.pinimg.com/originals/3a/3c/db/3a3cdbeaf252baaf... | Why is forming a chemical bond described as exothermic, whilst it appears to be endothermic?
Little bit of background info: Currently I study UK A-Level Chemistry and physics, so please don't expect too much. Recently, when studying energetics (enthalpy changes, bonding, etc.) I noticed what appeared to be contradictin... | [
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1cikgl | Is it possible to stop or divert a lava flow? | I was on the island of Hawaii recently and heard that a lava flow was heading toward a town and may destroy it in several years if it does not change its course. If it does not flow elsewhere, could barriers or other impediments be constructed to block or divert it, or would they simply be melted or burned? | askscience | {
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} | Is it possible to stop or divert a lava flow?
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2qa5cf | Ask Anything Wednesday - Engineering, Mathematics, Computer Science | Welcome to our weekly feature, Ask Anything Wednesday - this week we are focusing on **Engineering, Mathematics, Computer Science**
Do you have a question within these topics you weren't sure was worth submitting? Is something a bit too speculative for a typical /r/AskScience post? No question is too big or small for ... | askscience | {
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"url": [
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} | Ask Anything Wednesday - Engineering, Mathematics, Computer Science
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1rhpdk | Has anyone done a study on droplet splash height? | What I mean is, when a droplet, or an object, hits a liquid surface perpendicularly, often a smaller droplet is formed and rebounds. Has anyone done a study, even or perhaps better, an empirical one, on the various parameters that contribute to how large the secondary droplet is, and it's velocity? How does varying t... | askscience | {
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"There are universities who have reasearch groups on droplet dynamics, its still an indepent field in thermodynamics and important for jet engines, motors etc. They are detailed simulations on drop behaviour as ... | {
"url": []
} | {
"url": []
} | {
"url": [
"http://en.wikipedia.org/wiki/Weber_number",
"http://www.uni-stuttgart.de/itlr/forschung/tropfen/fs3d/index.php?lang=en&open=t&lang=en",
"http://en.wikipedia.org/wiki/Weber_number",
"http://www.youtube.com/watch?v=ynk4vJa-VaQ",
"http://www.youtube.com/watch?v=QQ37RLXNAgc",
... | Has anyone done a study on droplet splash height?
What I mean is, when a droplet, or an object, hits a liquid surface perpendicularly, often a smaller droplet is formed and rebounds. Has anyone done a study, even or perhaps better, an empirical one, on the various parameters that contribute to how large the secondary d... | [
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pqbue | I need askscience's help to respond to a creationist's inquiries. | askscience | {
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"c3re6oq",
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"text": [
"Wowzers. There's a lot of wrong here. (and EDIT - I'd love to know what the downvotes are for)\n > If you would like to continue, then how about we work on the age of the Earth first. Carbon dating can only ef... | {
"url": []
} | {
"url": []
} | {
"url": [
"http://en.wikipedia.org/wiki/File:Stratigraphy_of_the_Grand_Canyon.png",
"http://www.ngdc.noaa.gov/mgg/ocean_age/data/2008/ngdc-generated_images/whole_world/2008_age_of_oceans_p1024.jpg",
"http://geoinfo.nmt.edu/staff/scholle/graphics/Unconf.html",
"http://en.wikipedia.org/wiki/Accretionar... | I need askscience's help to respond to a creationist's inquiries.
| [
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45r51k | In the 19th century, the concept of ether was disproven, but the Higgs field sounds a lot like ether to me. How are they different? | askscience | {
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"The main feature of the ether is that it created a universal reference frame as the medium in which light traveled. In order for it to work it had to be possible to tell how fast you were moving with respect to... | {
"url": []
} | {
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} | In the 19th century, the concept of ether was disproven, but the Higgs field sounds a lot like ether to me. How are they different?
| [
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6gv7xg | How would you measure the speed of light using typical household appliances and materials? | askscience | {
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"text": [
"There are some DIY experiments you can do at home, like [this one](_URL_0_), which will allow you to measure the speed of light.",
"The Fizeau-Foucault apparatus used a mirror to reflect light through gear teeth. The light would pass th... | {
"url": []
} | {
"url": []
} | {
"url": [
"http://imgur.com/gallery/uiwcv",
"https://en.wikipedia.org/wiki/Fizeau%E2%80%93Foucault_apparatus"
]
} | How would you measure the speed of light using typical household appliances and materials?
| [
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2yhbie | When I stand in the same room where I was born on my birthday, am I in the exact same place in the universe then the moment I was born? | Birthday today, I was just wondering. | askscience | {
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"**Short answer:** Sorta. There is no real such thing as a *position in the universe*, just positions *with respect to the positions of other things.*\n\n**Long answer:** This is a great question that really get... | {
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} | {
"url": []
} | {
"url": [
"http://www.metrolyrics.com/galaxy-song-lyrics-monty-python.html",
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} | When I stand in the same room where I was born on my birthday, am I in the exact same place in the universe then the moment I was born?
Birthday today, I was just wondering. | [
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u9dt2 | Why have we not revisited the idea of nuclear aircraft? | I was thinking about this because I recently found out how much carbon emissions are released by [air travel](_URL_1_).
It seems to me that the biggest problem with nuclear aircraft was radiation shielding, but newer technologies like [Demron](_URL_0_) could compensate for that, right?
Add to that the size of propos... | askscience | {
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"Power plant for aircraft require an extremely high power-to-weight ratio [[1](_URL_5_)]. The Boeing 747-300 requires ~1400 W/kg (ibid.)\n\nA nuclear power unit would require a thermodynamic cycle to extract thermal energy fro... | {
"url": []
} | {
"url": [
"http://en.wikipedia.org/wiki/Demron",
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"http://en.wikipedia.org/wiki/Blended_wing_body"
]
} | {
"url": [
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"http://en.wikipedia.org/wiki/Tupolev_Tu-119",
"http://www.defense.gov/transformation/articles/2006-11/ta111006b.html",
"http://en.wikipedia.org/wiki/Power-t... | Why have we not revisited the idea of nuclear aircraft?
I was thinking about this because I recently found out how much carbon emissions are released by [air travel](_URL_1_). It seems to me that the biggest problem with nuclear aircraft was radiation shielding, but newer technologies like [Demron](_URL_0_) could compe... | [
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ptqj6 | Are we all afloat? | A tennis ball floats in water, but a marble will sink. On the atomic level, are we "floating" on the floor since its atoms have a higher density than us? | askscience | {
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"url": []
} | {
"url": []
} | {
"url": [
"http://www.ru.nl/hfml/research/levitation/diamagnetically/",
"http://en.wikipedia.org/wiki/Aerogel"
]
} | Are we all afloat?
A tennis ball floats in water, but a marble will sink. On the atomic level, are we "floating" on the floor since its atoms have a higher density than us? | [
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3ql6wd | Why are acoustically guided weapons an option in the ocean but not in the air? | For example, most modern stealth warplanes take great care to minimize their infrared and radar signatures, but are still quite loud. Would it be possible to track these planes acoustically? | askscience | {
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"Ships are extremely slow (say 15 m/s / 30 knots) compared to the speed of sound in water (1500 m/s). What that means is that acoustic detection is practically instantaneous -- when the sound waves hit you, the target hasn't moved far.\n\nWa... | {
"url": []
} | {
"url": []
} | {
"url": []
} | Why are acoustically guided weapons an option in the ocean but not in the air?
For example, most modern stealth warplanes take great care to minimize their infrared and radar signatures, but are still quite loud. Would it be possible to track these planes acoustically? | [
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bi9ikz | Why do we use speed *bumps* rather than furrows? | Furrows as in digging out the road like an *anti-bump* .
Is this more dangerous and if so how? | askscience | {
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"A furrow or trench would likely collect all sorts of crap. Leaves, trash, dirt. In rain it would be more likely to flood, making it harder to see. In snow, it would fill up and become useless (or a traction hazard). It would be harder to se... | {
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} | {
"url": []
} | {
"url": []
} | Why do we use speed *bumps* rather than furrows?
Furrows as in digging out the road like an *anti-bump* . Is this more dangerous and if so how? | [
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5yeopq | Does electricity need a high voltage or a high current to continue through a gap in a wire? | Say with a 0.5 mm gap would it be possible for me to get electricity consistently jumping across without dealing with a deadly current? | askscience | {
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} | {
"url": []
} | {
"url": [
"https://en.m.wikipedia.org/wiki/Paschen's_law"
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} | Does electricity need a high voltage or a high current to continue through a gap in a wire?
Say with a 0.5 mm gap would it be possible for me to get electricity consistently jumping across without dealing with a deadly current? | [
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22dyb5 | AskScience Cosmos Q & A thread. Episode 5: Hiding in the Light | Welcome to AskScience! **This thread is for asking and answering questions about the science in *Cosmos: A Spacetime Odyssey*.**
If you are outside of the US or Canada, you may only now be seeing the fourth episode aired on television. If so, [please take a look at last week's thread instead.](_URL_0_)
This week ... | askscience | {
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"http://www.reddit.com/r/askscience/wiki/index",
"http://www.reddit.com/r/space/comments/22dvkm/cosmos_a_spacetime_odyssey_episode_5_hiding_in/",
"http://www.reddit.com/r/Cosmos/comments/... | {
"url": []
} | AskScience Cosmos Q & A thread. Episode 5: Hiding in the Light
Welcome to AskScience! **This thread is for asking and answering questions about the science in *Cosmos: A Spacetime Odyssey*.** If you are outside of the US or Canada, you may only now be seeing the fourth episode aired on television. If so, [please take a... | [
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nina2 | What is the importance of "sigma" mainly in particle physics, how is it calculated, and is it possible to somehow visualize it as a layman? | I have tried googling "sigma importance" and several other contexts, and I noticed several askers with the same question (for example [here](_URL_0_)). There is also a ton of webpages with the keywords of "six sigma", and I can't find a single tree for all the forest. | askscience | {
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"Sigma is a symbol used to represent a [standard deviation](_URL_0_).\n\nIn the context of particle physics, it's used to distinguish how likely something is to be a result of random chance.\n\nE.g., suppose you... | {
"url": []
} | {
"url": [
"http://physics.stackexchange.com/questions/8752/standard-deviation-in-particle-physics"
]
} | {
"url": [
"http://en.wikipedia.org/wiki/Standard_deviation",
"http://www.reddit.com/r/explainlikeimfive/comments/ni4ht/eli5_how_a_bell_curve_works/c39b1jl",
"http://en.wikipedia.org/wiki/Standard_deviation"
]
} | What is the importance of "sigma" mainly in particle physics, how is it calculated, and is it possible to somehow visualize it as a layman?
I have tried googling "sigma importance" and several other contexts, and I noticed several askers with the same question (for example [here](_URL_0_)). There is also a ton of webpa... | [
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2jfgnv | Is the atom considered stateless? | I understand the interaction between between atoms (distance, composition) determines whether a mixture or compound is a solid liquid or gas. does this mean the individual atoms themselves don't fall into these categories? | askscience | {
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"In terms of gas, liquid, solid, etc. states. Yes a single particle doesn't really have a definite state. \n\nIf you have thousands of molecules that fly about not really caring about each other, you have a gas.\n\nIf you have thousands of ... | {
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} | {
"url": []
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} | Is the atom considered stateless?
I understand the interaction between between atoms (distance, composition) determines whether a mixture or compound is a solid liquid or gas. does this mean the individual atoms themselves don't fall into these categories? | [
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10ar6h | If I lose a leg, how much less will I need to eat? | If I had a leg amputated or ripped off or whatever. Obviously my body would need to supply less energy because those muscles, etc. aren't using up energy anymore. But how much energy? What about if I lost an arm? | askscience | {
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"I think the question could also be phrased as roughly how many calories does a normal leg burn in a day?",
"> Obviously my body would need to supply less energy because those muscles, etc. aren't using up ... | {
"url": []
} | {
"url": []
} | {
"url": [
"http://en.wikipedia.org/wiki/Muscle#Energy_consumption",
"http://www.google.com/url?sa=t&source=web&cd=1&ved=0CCIQFjAA&url=http%3A%2F%2Fcourses.washington.edu%2Fpharm309%2Fcalculations%2FLesson4.pdf&ei=RFleUKzHFIn88QS-84GAAw&usg=AFQjCNEUdlqdu4palHHePaPrYUs38DY-lg"
]
} | If I lose a leg, how much less will I need to eat?
If I had a leg amputated or ripped off or whatever. Obviously my body would need to supply less energy because those muscles, etc. aren't using up energy anymore. But how much energy? What about if I lost an arm? | [
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zc31l | How long would services like tap water, electricity, internet etc stay on in the event of something like an aggressive infectious disease began killing enough people for the world to become sparsely populated. | askscience | {
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"text": [
"Im a network engineer.\nThe internet would ramp down. Not su... | {
"url": []
} | {
"url": []
} | {
"url": [
"http://www.straightdope.com/columns/read/2165/when-the-zombies-take-over-how-long-till-the-electricity-fails",
"http://www.history.com/shows/life-after-people",
"http://en.wikipedia.org/wiki/Fossil-fuel_power_station",
"http://en.wikipedia.org/wiki/Electric_power_transmission#Bulk_power_tr... | How long would services like tap water, electricity, internet etc stay on in the event of something like an aggressive infectious disease began killing enough people for the world to become sparsely populated.
| [
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10oecd | Am I shoving tiny shards of metal into my skin every day? | After I use a razor for a large enough number of shaves, it becomes dull, and I throw it away. But, something just occurred to me: what's happening to the sharp edge of the razor? There was metal there at one point, and now there's not.
So, when I'm shaving, is any metal from the razor going into my skin? If so, what ... | askscience | {
"a_id": [
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"text": [
"The edge is not disappearing, it is being bent out of shape. Its why people who use a straight razor use a [strop](_URL_1_). It is the same with knives. If you do not use a strop or steel you can damage the edge enough to need sharpening... | {
"url": []
} | {
"url": []
} | {
"url": [
"http://hotchefknives.com/chef-knife-sharpening-101-honing-vs-sharpening",
"http://www.emsplace.com/straight_razors_strop_use.htm",
"http://lifehacker.com/5356529/extend-your-razors-life-with-a-pair-of-jeans",
"http://www.reddit.com/r/asksciencefair/comments/mllvg/qualitative_analysis_of_th... | Am I shoving tiny shards of metal into my skin every day?
After I use a razor for a large enough number of shaves, it becomes dull, and I throw it away. But, something just occurred to me: what's happening to the sharp edge of the razor? There was metal there at one point, and now there's not. So, when I'm shaving, is ... | [
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5dc92y | Is there a way to create a 'sound bubble' where the sound is only audible within a controllable radius? | Without changing the medium, and with either a discrete edge or a rapidly decreasing signal past the 'radius' of the bubble. | askscience | {
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],
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"I am not sure about a specific radius, but i know it is possible to isolate sounds in specific areas using geometry and different types of mediums. For example there is a circular shaped, fountain for lack of ... | {
"url": []
} | {
"url": []
} | {
"url": [
"http://adage.com/article/news/hear-voices-ad/122491/"
]
} | Is there a way to create a 'sound bubble' where the sound is only audible within a controllable radius?
Without changing the medium, and with either a discrete edge or a rapidly decreasing signal past the 'radius' of the bubble. | [
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2yj4e8 | How did predatory packs evolve? Why didn't the jerks in the group who just took advantage of the others gain evolutionary advantage over the ones who were willing to sacrifice and give things up to the group? | If coyotes (a primarily loner predator) and wolves (a pack predator) had a common ancestor, then there was a point where they branched apart. At that branch, some went off to be loner douches and the others went off to make the hippy communes of the canine world. How did those early canines in the population who wanted... | askscience | {
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"text": [
"I can't speak specifically to pack animals, but I can speak to the general concept of \"Why don't cheaters ruin cooperation?\"\n\nThis concept is often referred to as \"The Tragedy of the Commons\", and is pretty much the sam... | {
"url": []
} | {
"url": []
} | {
"url": [
"http://en.wikipedia.org/wiki/Simpson's_paradox"
]
} | How did predatory packs evolve? Why didn't the jerks in the group who just took advantage of the others gain evolutionary advantage over the ones who were willing to sacrifice and give things up to the group?
If coyotes (a primarily loner predator) and wolves (a pack predator) had a common ancestor, then there was a po... | [
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50mt9d | AskScience AMA Series: I am the co-founder of iNaturalist, an online social network for sharing biodiversity information. Ask Me Anything! | [iNaturalist](_URL_0_) is an online social network of people sharing biodiversity information to help each other learn about nature. It's also a crowdsourced species identification system and an organism occurrence recording tool. You can use it to record your own observations, get help with identifications, collaborat... | askscience | {
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"url": []
} | {
"url": [
"http://www.inaturalist.org/"
]
} | {
"url": [
"http://rs.tdwg.org/dwc/"
]
} | AskScience AMA Series: I am the co-founder of iNaturalist, an online social network for sharing biodiversity information. Ask Me Anything!
[iNaturalist](_URL_0_) is an online social network of people sharing biodiversity information to help each other learn about nature. It's also a crowdsourced species identification ... | [
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2emlfa | How do research satellites measure ice? | Meteorological satellites are used to measure the progression and regression of ice at the polar caps. My question is, how do they do this? I can easily envision the answer being something like "infrared imaging," or "visible reflections" or maybe a radar system of some sort.
Is there a preferred method? | askscience | {
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"text": [
"It is done with by looking at the intensity of multiple bands in the microwave region of the electromagnetic spectrum in order to distinguish between ice/snow and water. [CryoSat](_URL_0_) is one example but there are others.... | {
"url": []
} | {
"url": []
} | {
"url": [
"http://en.wikipedia.org/wiki/Cryosat-2",
"http://en.wikipedia.org/wiki/Interferometric_synthetic_aperture_radar",
"http://en.wikipedia.org/wiki/Lidar",
"https://www.youtube.com/watch?v=kteMXaUNvlc",
"http://en.wikipedia.org/wiki/Operation_IceBridge",
"http://www.nasa.gov/mission_pa... | How do research satellites measure ice?
Meteorological satellites are used to measure the progression and regression of ice at the polar caps. My question is, how do they do this? I can easily envision the answer being something like "infrared imaging," or "visible reflections" or maybe a radar system of some sort. Is ... | [
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9d5id2 | AskScience AMA Series: I'm Michael Abramoff, a physician/scientist, and Principal Investigator of the study that led the FDA to approve the first ever autonomous diagnostic AI, which makes a clinical decision without a human expert. AMA. | [Nature Digital Medicine published our study last week, and it is open access](_URL_0_). This publication had some delay after the [FDA approved the AI-system, called IDx-DR, on April 11 of this year](_URL_4_).
After the approval, many physicians, scientists, and patients had questions about the safety of the AI syste... | askscience | {
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"url": []
} | {
"url": [
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"https://www.eyediagnosis.net/",
"https://docs.wixstatic.com/ugd/ea14f7_410f793af1504f46a9bf76d20a3b4d02.pdf",
"https://medicine.uiowa.edu/eye/abramoff",
"https://www.fda.gov/newsevents/newsroom/pressannouncements/ucm604357.htm"
]
} | {
"url": [
"http://www.ascopost.com/issues/may-25-2017/the-ongoing-challenges-of-lung-cancer-screening/",
"abemis.com"
]
} | AskScience AMA Series: I'm Michael Abramoff, a physician/scientist, and Principal Investigator of the study that led the FDA to approve the first ever autonomous diagnostic AI, which makes a clinical decision without a human expert. AMA.
[Nature Digital Medicine published our study last week, and it is open access](_UR... | [
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12qtgf | Might there be frozen seeds under antarcticas ice? Could they be dug out and planted again? | Hi Askscience!
I wondered what happened to all the seeds in antarctica. I'm aware than old seeds have been found/dug out in ancient graves that were still fertile.
Could it be that there are fertile seeds under the kilometers of ice above the antarctican mainland?
Thank you! | askscience | {
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"text": [
"If there are seeds there they could possibly be coaxed into growing a plant. There was recently a group in Siberia that found a cache o... | {
"url": []
} | {
"url": []
} | {
"url": [
"http://www.nytimes.com/2012/02/21/science/new-life-from-an-arctic-flower-that-died-32000-years-ago.html",
"http://www.dailymail.co.uk/sciencetech/article-2161105/NASA-discovers-Antarctica-pretty-warm-7C-20million-years-ago--did-rain-lot.html",
"http://www.nature.com/news/dna-has-a-521-year-hal... | Might there be frozen seeds under antarcticas ice? Could they be dug out and planted again?
Hi Askscience! I wondered what happened to all the seeds in antarctica. I'm aware than old seeds have been found/dug out in ancient graves that were still fertile. Could it be that there are fertile seeds under the kilometers of... | [
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ohorf | Is there anything a person can do to increase their reasoning ability? | I'm not talking about getting an education or learning how to make logical arguments. I'm talking about the pure mental ability to reason and draw connections etc. Do those brain age games really exercise your noggin and produce any gains? Are there vitamins or "brain foods" that stimulate more neural growth? Do certai... | askscience | {
"a_id": [
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"text": [
"You have to be careful when you say \"reasoning ability\" as a general encompassing function.\n\nFor example, let's talk about \"draw[ing] connections\". Suppose I ask you to give me a word that goes with \"crab\", \"pine\", and \"sauce\". ... | {
"url": []
} | {
"url": []
} | {
"url": [
"http://www.pnas.org/content/early/2011/06/03/1103228108.abstract",
"http://www.sciencedaily.com/news/mind_brain/intelligence/",
"http://brainworkshop.sourceforge.net/",
"http://www.badscience.net/",
"http://www.scientificamerican.com/article.cfm?id=bilingual-brains",
"http://www.li... | Is there anything a person can do to increase their reasoning ability?
I'm not talking about getting an education or learning how to make logical arguments. I'm talking about the pure mental ability to reason and draw connections etc. Do those brain age games really exercise your noggin and produce any gains? Are there... | [
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x0whd | Is there any scientific/statistical validity to the phenomenon of "beginner's luck"? | I think we'd all agree that there isn't some fairy who makes you better or more successful at something when you are new at it, so why does this saying exist? Is it merely that everything seems more successful with lower expectations for being new? | askscience | {
"a_id": [
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],
"text": [
"There is definitely one explanation I can think of, which is that when someone is just starting a game they won't necessarily play the \"conventional\" moves their opponent expects, so the opponent has to deviate from their normal play styl... | {
"url": []
} | {
"url": []
} | {
"url": [
"http://en.wikipedia.org/wiki/Beginner's_luck"
]
} | Is there any scientific/statistical validity to the phenomenon of "beginner's luck"?
I think we'd all agree that there isn't some fairy who makes you better or more successful at something when you are new at it, so why does this saying exist? Is it merely that everything seems more successful with lower expectations f... | [
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1m6euh | About that large aquifer discovered in Kenya recently - could similar undiscovered aquifers exist anywhere in the world? If not, what areas remain unexplored? | The aquifer in question:
_URL_0_
Does anyone know how the aquifer was discovered? Were they looking for underground water or was this from petroleum exploration? | askscience | {
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"text": [
"Aquifers can exist almost anywhere. Have you ever wondered why Nebraska is such a huge farming state?\n\n_URL_0_\n\nThey pull the water up from beneath ground using a pump and use the water to su... | {
"url": []
} | {
"url": [
"http://www.itv.com/news/2013-09-10/kenya-water-aquifer-found-in-lotikipi/"
]
} | {
"url": [
"http://en.wikipedia.org/wiki/Ogallala_Aquifer",
"http://en.wikipedia.org/wiki/Soil_salinity",
"http://www.sabc.co.za/news/a/4ecf3900410ecd98bc48bcd93e1dcbd3/Huge-water-reservoirs-discovered-in-dry-Northern-Kenya-20131109"
]
} | About that large aquifer discovered in Kenya recently - could similar undiscovered aquifers exist anywhere in the world? If not, what areas remain unexplored?
The aquifer in question: _URL_0_ Does anyone know how the aquifer was discovered? Were they looking for underground water or was this from petroleum exploration? | [
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6tgg95 | Did dinosaurs urinate like mammals or poo uric acid like birds? | askscience | {
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"url": []
} | {
"url": []
} | {
"url": [
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]
} | Did dinosaurs urinate like mammals or poo uric acid like birds?
| [
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50exnw | Why can't an A/C unit also double as a heating unit? | [deleted] | askscience | {
"a_id": [
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],
"text": [
"In principle it **can**.\nAn air conditioner is in principle a heat pump, pumping heat e.g. from your room to the outside (just like a refrigerator). So in principle (depending on how the A/C unit is build) it can also pump heat from the ou... | {
"url": []
} | {
"url": []
} | {
"url": [
"https://en.wikipedia.org/wiki/Air_conditioning#Heat_pump_unit"
]
} | Why can't an A/C unit also double as a heating unit?
[deleted] | [
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2lkqah | Could science ever truly bring back an extinct species, such as the Tasmanian tiger or similar? If so, why hasn't it been done yet? | askscience | {
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"url": []
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"url": [
"http://www.sciencedirect.com/science/article/pii/S0093691X08007784",
"http://news.nationalgeographic.com/news/2014/08/140831-passenger-pigeon-martha-deextinction-dna-animals-species/",
"http://www.sciencemag.org/content/337/6100/1357.abstract",
"http://www.pbs.org/wnet/nature/episodes/savi... | Could science ever truly bring back an extinct species, such as the Tasmanian tiger or similar? If so, why hasn't it been done yet?
| [
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