query stringlengths 20 300 | positive listlengths 1 1 | negative listlengths 1 1 |
|---|---|---|
By how much would the sea-level rise if the entire human population of earth got in the ocean? | [
"Let's see - average displacement of a person is about 80 liters, times 7^9 people, equals 560^9 liters, or 560^6 cubic meters. Divide that by about 350^6 km^2, which is 350^12 square meters, you get 1.6^-6 meters, or 1.6^-3 mm. Pretty small ocean level rise."
] | [
"There was a whole show made about this called Life After People. It's on NetFlix, can't find a link as I'm on my phone. The short answer to your question is: not very long."
] |
What does "Of total installed capacity mean?" (Energy sector) | [
"Maybe best illustrate with an example : Say, we have : 5000 MW of coal Power 3000 MW of hydro power 2000 MW of other renewables. Then coal would be 50 % of installed capacity; hydro would be 30% of installed capacity, and other renewables would be 20%. This does not mean that coal produces 50 % of all the electri... | [
"Imagine you have a computer on your house. Now you want to connect that computer to your friend 100 miles away. How do you do it? You could lay a 100 mile cable, but do you have the permissions to dig up roads and pathways? You would use a company whose cables were already there, and just use that network of cab... |
Goldfish (carp) remain small in a fish tank, but can grow many times larger when released into the wild. How does their body "know" whether to keep growing or not? | [
"Fish don't magically adapt to their tank's size--this is a myth. However, fish kept in a tank will often never reach their full size based on [a number of factors](_URL_0_): malnutrition, muscle atrophy, genetics, chemical buildup, etc."
] | [
"Machine learning algorithms must be \"trained\" for them to be effective at prediction. This process happens very similarly to how humans learn as well. The model makes a prediction, and know whether that prediction was correct. This is why we feed the algorithm data that includes the outcome of the event. The alg... |
What was the first widespread fast food? Is there an ancient equivalence to the shawarma stands all over Jerusalem or the fish and chips shops in London? | [
"Hi, u/Soap_MacLavish, You may be interested in these posts: * \"[Did Romans have street food?](_URL_3_)\" with an answer by u/chitoryu12. * \"[I'm sitting here eating chips. Did the people of the Roman empire have an equivalent of such snack foods?](_URL_2_)\" with an answer by u/samadhii. This goes both into food... | [
"Hey there, Just a reminder that /r/AskHistorians is called Ask*Historians* for a reason: we want to see original, in-depth, comprehensive answers based on solid research - not just looking at Wikipedia but engaging with scholarly research on the topic. If your knowledge on this topic isn't up to this standard, we ... |
Why are name brand foods usually better than store brands? Or are we just suckers for marketing? | [
"Sometimes the name brands use more expensive ingredients, proprietary recipes, or just have tighter quality control standards. Sometimes they're the exact same thing in a different wrapper. We are suckers for marketing though."
] | [
"Simply put for the same reason drinking water when you're not thirsty isn't as refreshing as when you're REALLY thirsty. Anticipating the bodies' needs doesn't trigger the same reward responses in the brain as fulfilling a need that is already present. Your muscles don't NEED to stretch right now, so you can't ant... |
How does music recognition/identification software work? | [
"There's a past question with good answers [here](_URL_0_). However, I'm approving this in case somebody can followup with possible advances, or more detailed explanations."
] | [
"There's a database which has a big list of what malicious code looks like. It goes through that to see if there's any malicious code in the file."
] |
Cuban Missile Crisis | [
"The Armageddon Letters came out a few years ago and seeks to examine this exact same question. The authors try to look at the conflict through the eyes and experiences of JFK, Khrushchev, and - especially - Castro. [Kennedy's PoV](_URL_0_) [Khrushchev's PoV](_URL_1_) [Castro's PoV](_URL_2_)"
] | [
"To add to this, what was the Paris massacre of 1961?"
] |
What happens if someone joins the Navy and doesn’t know that they get extremely sea sick until after they are underway at sea? | [
"They go to sick bay and get given anti sickness drugs, put up with the symptoms and eventually get used to it. Usually just before they hit land for a while and then have to go through the whole process of acclimatisation again. Souce: my dad was in the navy and gets sea sick. He still enjoyed his time as he did s... | [
"Right now a polarizing system is used where each lens on the glasses is polarized in a way that corresponds with 1 of the two pictures being projected, causing it to be black in that eye, which leads to two different pictures in each eye. So, someone who is color blind would have no issues with the current system ... |
How can Russia 'kick' US astronauts out of the ISS, if its an international project? | [
"Russia has the only transportation to/from the ISS. If they don't want to transport US astronauts we can't force them."
] | [
"China did rule over the Russian region of Primorye (where Vladivostok is) at one point. The area used to belong to China as Outer Manchuria, but was handed over to Russia as part of the unequal Conventions of Beijing in the mid-1800s after the second Opium War, along with Hong Kong to the British. While Hong Kong ... |
I just donated blood. "Jack" received my blood and then a very short time later committed a crime and left a drop of blood at the scene. Would my DNA be in that drop of blood, possibly implicating me in the crime? | [
"There are leukocytes (white blood cells) in packed red blood cell units, even if they are \"leukocyte reduced\". These white blood cells do contain DNA, but the genetic testing that is done on blood in forensic testing can differentiate between Jack's own leukocytes and the donors. If you donated stem cells to Jac... | [
"If the cut is superficial and doesn’t cause substantial scarring then your fingerprint will grow back. You probably already know that the skin is made up of the dermis and epidermis and that the epidermis itself is also layered. The reason superficial cuts don’t get rid of your finger print is because it is caused... |
Why do we perceive things as being animate or inanimate? | [
"This is an excellent and very deep question. The animate/inanimate difference is one of the most reliable distinctions we can make in neuroimaging in carving up neural representations of semantic space (apart from faces vs. scenes vs. objects). I'm not familiar with a theory of *why* this distinction arises apart ... | [
"I love this question. There is a movie called Waking Life that addresses this idea. The whole movie is on YouTube right now for free and is awesome. Check it out. But at the minute 40:35 is when your question gets talked about. _URL_8_"
] |
how and why civilizations/cities build up in layers over time? | [
"If you tear down a building, you *might* cart off all the remaining materiel. Older, less technologically advanced civilizations might not. As well, a fair number of buildings collapse instead of being deliberately condemned, which means the rubble is more or less just built over. Yes, this does mean that some cit... | [
"[Here's a thread in /r/AskHistorians about this exact topic.](_URL_0_) Maybe not exactly explained like you're five, but it's not a bad thread."
] |
How can any drug cost $360,000 a year for a patient. | [
"When a pharmaceutical company creates and patents a new drug, they can charge as much as they want for it, since no one else is able to sell or produce it without their consent. The reason this doesn't completely prevent people from accessing the drug is because their health insurance providers often pay for it. O... | [
"- Paul McCartney (800m) - Michael Jackson (600m) - Bono (600m) You're comparing apples and oranges. Madonna, Celine Dion and Mariah Carey are decades-long international superstars. Jay Z, Justin Timberlake and Justin Bieber made music for less than a decade to largely American acclaim."
] |
How do you read a stock chart? | [
"P/E is price earnings ratio... that's the company's stock price relative to its annual profits per share. For most companies, it's typically around 15 or so. For slow growth companies like a utility, it might only be 5 or so, and for fast growth companies it might be well over 100. Can even be infinite if the comp... | [
"**Like this!** Oh, sorry. Forgot you weren't a real 5-year-old."
] |
Why does “the economy” just go bad sometimes? The world has roughly the same resources before during and after a recession/depression, right? It seems like it just arbitrarily goes bad and we point to symptoms and domino effects but not causes. | [
"The economy is growing all the time, more people are being born, inventing things and buying things. There’s also people who bet money on whether the economy will go up or down all the time. Finally, in order for the economy to grow people lend money with the hope that as the economy grows they’ll make more money.... | [
"To be clear the detox and being clean for a few weeks or months, depending, will stop the physical symptoms of addiction, shakes ect not cravings. So when you take a drug that changes the way your body/brain functions your body will slowly become accustom to the drugs effects and the will be less effective, this ... |
why do cough lozenges work on sore throat when our saliva goes into the food pipe whereas our vocal chords are inside the windpipe? | [
"Most sore throats hurt at the back of your mouth, right at the \"top\" of the throat. So swallowing the melted lozenge with its numbing ingredient (usually menthol or pectin) repeatedly coats the inflamed area and reduces pain for a little while."
] | [
"The flavor of the toothpaste has nothing to do with the change in taste of the OJ. Most toothpaste has Sodium lauryl Sulfate in it [or something similar] to give the toothpaste its \"frothiness\". The downside to this chemical is that it blocks your sweet taste buds. So without the sweet taste buds tasting the sug... |
The structure of the Anonymous hacking group. Anyone can be a member, but do they have any sort of structure, or is it a complete free-for-all? | [
"There's no actual membership or community structure. It's a lot like being a redditor. You're a member of anonymous if you frequent the parts of the web (most notably 4chan) where anonymous communicates, but for the most part your level of involvement is determined by how long you've been involved with anonymous a... | [
"> how do different parts of the crystal know to stop growing at the right point to give it a \"regular\" shape? They don't, and if you need a crystal that ends in a single layer you should polish it very, very carefully. Atoms rarely start a new layer - the new atom is weakly bound and doesn't fit well to the over... |
The history of Acropolis of Athens and its name | [
"\"Acropolis\" simply means \"upper city\", and it refers to a (usually fortified) area of higher ground in/above a city. The Acropolis of Athens is the original name for the citadel above the city of Athens, but not all acropolises are named Acropolis of _____. For example, the acropolis above Corinth is usually r... | [
"hi! in addition to /u/Jack_of_all_offs' link, here are a few more related discussions you may find of interest * [To what extent was the Tiananmen Square movement actually motivated by democracy?](_URL_1_) * [I've just read that there was no massacre of students in Tiananmen Square on June 4th 1989. What's the dea... |
What is Basic Income and why does everyone think it's such a good idea? | [
"Some amount of money paid to each citizen no strings, as an alternative to social security. I think the numbers pay out to similar costs. And the benefits are supposed to be substantial. It's already in practice at a small scale in Alaska."
] | [
"Thank you for your submission! Unfortunately, your submission has been removed for the following reason(s): You can find the basic answer with a google / wiki search. Please start there and come back with a more specific question. If you disagree with this decision, please send a [message to the moderators.](_URL... |
Given DNA samples, one belonging to a parent and the other to their child, is it possible to determine which is the parent and which is the child? | [
"Epigenetics. Depending on multiple factors, only certain parts of the genome are active in a given cell. One immediate mechanism for how this happens is DNA methylation, which silences portions of an organism's DNA by directly attaching a methyl group to nucleotides in the DNA. The methylation \"profile\" can and ... | [
"Every gun barrel leaves unique marks on the bullets it fires. Police can fire a test bullet into water or ballistic gel and then compare the marks to a bullet used in a crime."
] |
Will compressing a stream of air result in a lower temperature? | [
"The air being forced through the smaller opening focuses the pressure from the wind, increasing airflow. You probably understand that part. Humans radiate heat, creating a shell of warm air around them. This setup won't necessarily drop temperatures, but it will increase airflow in a room which allows for that hea... | [
"What you are missing is that the exhaust gas velocity depends on the gas molecular mass M. You can calculate it using [this equation](_URL_0_) of the exhaust gas velocity in chocked flow. Basically the lighter the gas the faster it can go and the more efficient with you mass you are. However for a given tank (ie a... |
Can you help identify this dinosaur bone? | [
"I'll first caution that often when people find apparent fossils, they turn out to be just strangely shaped rocks. Also, I'm no paleontologist or geologist. That being said, it does look like a dino long-bone to me, at least. You should post this in /r/fossilid They're usually really good over there."
] | [
"There is a good deal of room for fresh responses to this question. But I briefly summarised the main controversies [in an earlier thread here](_URL_0_). The short answer is that we have no certainties about this at all, only a lot of supposition and a certain amount of reasonable deduction. Even the discovery of f... |
why does putting my headphones in the wrong ears make the mix sound like it has less bass? | [
"If you're talking about \"ear\" phones, manufacturers generally mold each bud to fit in a specific L or R auditory canal. If you put them on the wrong way, they do not seal the canal, allowing the pressure waves to travel out instead of to your drum."
] | [
"A stereo plug has three electrical contacts (tip, ring, and sleeve), assigned to left, right, and ground, respectively. The jack also has three contacts, aligned with those of a fully-inserted jack. When the plug is inserted into the jack, the contacts brush past each other, temporarily connecting improperly, then... |
Do animals display PTSD from similar near death expieriences like humans do? | [
"Yes. For example dogs who have been abused are typically very skittish, distrustful, and sometimes aggressive. They flinch if you touch them unexpectedly, and sometimes have panic attacks. Many animals display similar fears after a traumatic experience like a house fire."
] | [
"I think we develop a \"been there, done that\" mentality in ways. I can not watch cartoons now. No matter what the topic. The irony is I just can't pay attention to cartoons."
] |
How does a person like Bill Gates keep track of all his money? | [
"With some of the computer shit that he invented."
] | [
"Because the ships are designed for functionality with the least amount of weight--not aesthetics. Function over form. Regarding the personal items floating around--depends. Lots of items are secured in place with adhesive velcro pads or bungee cords. It's not really the norm to have a bunch of junk floating all ov... |
For those books that have printed versions labeled $9.99 and Kindle version $2.99, where does the 7 dollar difference go in the process of publication? Which one should I buy if I want to support the author more? | [
"It's complicated; there is a cost to printing and shipping of a hard copy of course, but the great majority of the cost lies in the editing and formatting that both versions rely on. The price you see isn't just a reflection of the cost, but also of the market--people are willing to pay different amounts for e-boo... | [
"Say you're in class, and good work provides results in jelly beans from the teacher. These are super jelly beans, and you need 10 beans a day to survive. So any amount of 10 beans is luxury. You work hard and you earn 20 beans, but in order to get those beans you used pencils and paper provided to you. Therefore ... |
Why humans don't explain everything like the other person is 5? Shouldn't we strive to always simplify things down as far as possible? | [
"\"Simplifying\" is not the same as \"dumbing down\", for one. Take the rules of this sub, for example - we don't *literally* explain things like we're talking to a 5-year-old even though we *do* try to simplify to the degree a layperson can understand. And that's another point. Say I'm a high-level network securit... | [
"Thank you for asking and answering. I was just asked what exactly is going on in Syria... my first thought - check r/explainlikeimfive."
] |
Why is it illegal to scalp tickets in front of a venue, but perfectly legal to jack up ticket prices on sites like Stubhub or Craigslist? | [
"Some states have serious restrictions on ticket resale, others do *not*. This is not universal. Scalping *at* the event is arbitrage. Scalpers can take advantage of people and price-gouge them. You are *not* guaranteed authenticity. So laws were made for consumer protection. Lastly, resale of tickets at sold-out... | [
"Basically, instead of responding to your argument, I make up an easier argument to fight, pretend that it's what you mean, and respond to that instead. Typically the fake argument (the \"straw man\") is a more extreme version of the original argument, but not always. So if you said something like \"I think we shou... |
Are there any other species of animal that are divided into different races or something biologically equivalent? | [
"All organisms have varying levels of diversity on all levels. Diversity between individuals within a population, and between populations. It is important to note that speciation is not a singular event, but the accrued genetic differences between populations, typically divided by some type of barrier, over time. I... | [
"Are you referring to American slavery? That is normally what folks on here are referring to. Be a little more specific please; if this is about America, I can tell you that the answer is \"no\" but only because Americans certainly knew that African slaves were \"human,\" or at the very least the law recognized the... |
Why did Europeans developed themselves in a much stronger way than for instance Native Americans who remained at a relatively small level of development when Europeans found them? | [
"depends on your measuring stick. people did what was best for them given the amount of natural resources, environment, etc around them. for example, maybe europeans had guns, but tomatoes originated in central america. where would you be without tomatoes? guns have little to no effect on your life, but i bet youv... | [
"If there's something in the water that can infect an elk, it can get sick and die. If there's nothing in the water that will infect a human, they'll be fine. Animals don't have a magical power, and humans don't have a magical weakness. It just makes a bigger splash in the news papers when \"Bob dies after drinkin... |
How can a central bank set a negative interest rate and why? | [
"It's a rare circumstance that nominal interest rates are actually negative, because you're guaranteed a 0% interest rate by holding cash. What's more common is that real interest rates are negative: the interest they return is less than inflation, so in the end, you get back less than you put in. If the interest ... | [
"Weird things start happening to matter near zero. Things no one thought would happen. Seeing what actually does happen gives us a lot of new insights. And new insights make new things possible."
] |
Does the body contain or use any electricity? | [
"Yes, your nerves transmit sensations and thoughts using electrochemical signals. _URL_0_ I wish I could help more, but I am no expert."
] | [
"They use a method called \"Coulomb counting\". Imagine you bought a wallet to store your money. You know it's empty. Now you put $100. You know, the wallet holds $100. Then you stopped by a gas station and spent $20. Now, even without looking, you know that there are currently $80 in your wallet. Coulomb counting ... |
why does every website including Reddit want me to use an app instead of their damn website these days? | [
"Apps have a lot more permissions and device access than mobile web. For example, your web browser typically will not have camera access, which is why places that want to scan br or QR codes will need to have an app. Apps also can usually access more memory than mobile browser tabs, useful for high memory consumpti... | [
"Dynamic range. Your eye can resolve a candle a mile away at night, or the sun shining on white walls at noon, basically at the same time. Phone cameras are more limited, and tend to adjust for the brightest object in the field of view. That tends to darken everything else relative to your eyesight."
] |
if I'm feeling a cold/sickness coming on, is it better to exercise or give my body rest? | [
"If it's a mild cold, exercise at 50% your usual capacity, assuming you regularly work out. Ensure you also get adequate hydration and 8 hours of sleep. Adjust your exercise accordingly to your level of fatigue. It without fail works for me"
] | [
"I'm sorry that I'm no expert, but I remember reading about this the last time a similar question was asked: _URL_0_ Basically, you percieve time faster after your run because of endorphines released during the work out, which means that the music seems slower. This is apparently also why a lot of rock musicians pl... |
What's the difference between the 2.4 and the 5Ghz wi-fi? | [
"Basically there is no functional difference between the two, either way you in theory get the same thing. However, in practice at 5ghz you should get a lot less interference from other devices. Most Wifi Routers work on 2.4 ghz. Bluetooth devices work at 2.4ghz. Wireless mouse/keyboards work at 2.4 ghz. Basically... | [
"I had to consult his Nobel prize lecture to get some of the experimental details. It is well worth a read. _URL_0_ Lenard seems to have worked with electrons with energies around 30 keV (that is, accelerated by 30000 volts). Electrons of these energies will be fairly efficiently absorbed by materials on a length s... |
Is there any good reason a circle is 360 and not just 100? | [
"It's because 360 is easy to divide. Its factors are 1, 2, 3, 4, 5, 6, 8, 9, 10, 12, 15, 18, 20, 24, 30, 36, 40, 45, 60, 72, 90, 120, and 180. Knowing me, I probably missed some."
] | [
"For starters the extra costs to the manufacturer and the customer are not worth it. And second saftey, they could be dangerous closing down on little children & even adults."
] |
How did "Check Engine" lights work before cars had computer diagnostics? | [
"They didn't. The first check engine lights were introduced as a feature of the early computer controlled systems in cars during the early 80's."
] | [
"Some do, I know from personal experience the California Highway Patrol has a system and doohickey where your ticket is printed up just like a receipt at a store."
] |
If you instantly deleted all of the DNA in someone's body, what exactly would they die of? | [
"If death doesn't immediately follow the decrease in osmotic pressure in all your cells simultaneously due to a large volume of DNA inside of them vanishing then I think death by [histotoxic hypoxia](_URL_7_) is a possibility. Histotoxic hypoxia occurs when your body is unable to utilize oxygen for respiration, as ... | [
"Imagine your hard drive as a giant wall, like the Great Wall of China. Now imagine that your files are painted on this wall (Images, text, music notes). When you delete a file, your computer finds the spot on the wall where that file was painted, and marks that section of the wall as \"free\". It doesn't scrub o... |
Why are noble women usually depicted in medieval and post-renaissance paintings with grey or white hair? | [
"So, these paintings - judging by the artist you've linked - are not medieval. They're from the eighteenth century, and these women (and men) are being depicted with powdered hair and wigs. I've written a previous answer on this topic that might help you to understand: [In England 1700s(?) How did the trend of cake... | [
"I'm guessing that you're mainly thinking of domesticated animals and not wild ones. In that case the answer is here _URL_1_ - The tl;dr = there is a coloring pattern (known as \"Merle\" in dogs) considered attractive in inbred domestic animals (think border collies). It confers a very high incidence of heterochrom... |
Why is the Human body’s core temperature 37 degrees Celsius (98.6 degrees Fahrenheit) across the species, regardless of ethnicity or environmental location? | [
"All cells work by making proteins which react with other chemicals in a specific way. The hotter it is the faster these chemicals reactions happen. However if it becomes too hot then the proteins themselves will start to unfold which means they can no longer do their jobs. Depending on the protein this starts happ... | [
"To sell water and sports drinks. That's it. Most hydration experts will tell you \"drink when you're thirsty\". The human body has millions of years of evolution built in to tell you you need to drink. What it's never told you is that you need exactly 8 glasses of water a day. It's all marketing, and the fact that... |
Why is a rejection from the opposite sex not a big deal? | [
"The reality of the situation is attraction is something that is hard to pin down or predict. We have no control over who we're attracted to. You can't take it personally if you're attracted to somebody who isn't attracted to you. They can't force themselves to feel the same way you do. In some cases they might wis... | [
"As time passes you put the event or issue into its proper perspective as you learn more about it and things around it. Often times that makes you realize how inane some things are."
] |
How come I can't force myself to fall asleep wherever I please? | [
"Circadian rhythm. Your body naturally works in cycles of awake and sleep (nearly every living thing does, even plants and bacteria). The only way to alter one is to deprive the other, or alter your body chemistry to move the process along."
] | [
"Because you are not paying attention to what time it is. Your focus is on the task at hand. (Space filler because autobot will delete answer) Because you are not paying attention to what time it is. Your focus is on the task at hand. Because you are not paying attention to what time it is. Your focus is on the t... |
Does everything liquid... | [
"Liquid is just a state of matter; any element can be a liquid given the right conditions (temperature, pressure). Most liquids that are fit for consumption are basically things dissolved in water because water is liquid at standard temperatures and pressures, is abundant, and is a universal solvent."
] | [
"When you drive, your wheels are always between you and the road. Does this mean that you do not move up and down with the road? (Negating the effects of your shocks) you will still feel the entire topography of the road as if you were in direct contact with it. To avoid confusion it is better not to look at the fo... |
How does light from the sun shining from behind and over my CRT monitor, but not shining on to the screen, produce glare? | [
"It's not producing glare, your eyes are adjusting to the bright light by reducing your sensitivity to light (like walking outside). Because your sensitivity is decreased, you can't see your relatively dim screen anymore."
] | [
"I'd say to be careful using \"later\" emitted. It's tough to get into the specific details of what \"later\" means here. That being said, think of a photon causing the electrons to move in the surface (like a metal with free electrons to move). But the way the electrons move creates a photon of their own that app... |
When you listen to music on high volume in a loud place, does it damage your hearing the same way as it would in a quieter place? | [
"If you turn your music up, it will be more likely to damage your hearing. Doesn't matter how loud it is relative to your background noise. That's not considering if the background noise is loud enough to damage your hearing as well"
] | [
"You could have [tinnitus](_URL_0_). You should see a doctor if you want any further information, since asking for medical advice is not allowed in this forum."
] |
How significant was the UK's contribution to the allied victory in WWII compared to that of the USA and USSR? | [
"A corollary question would be \"how important was the Western Front/Strategic Air Command/Northern Lend-Lease routes to Germany's defeat?\" The primary contribution of the UK, in my opinion, was their actual landmass on the eastern side of the Atlantic that made those other things possible. (Not intending to minim... | [
"Firstly, we've had a lot longer to develop dialects than the US. We have been using (and abusing) the language since before the US was colonised. Also you must remember that our population is made up of indigenous people (the Celts) and invaders. Scottish, Welsh and Irish dialects and slang have been influenced b... |
Is there a maximum amount of energy that can be contained in a solar flare? Could the sun produce a solar flare beyond the X class? | [
"I can't speak to the maximum energy of a solar flare, but the definition of the X class ( > 10^-4 W/m^2 ) precludes there being a higher class. Within this class, there have been many examples of huge flares, like the X28 flare of 2003."
] | [
"Extrasolar planets are small and dim and really far away and their light is swamped by the light from their nearby stars. Existing telescopes for the most part don't even have the ability to distinguish the light from a planet direcdtly as a dot, much less map the planet. There is a proposal to devise a system to ... |
Offsides in Soccer/Football | [
"A player is said to be in an offside position if they are simultaneously: 1. In their opponents half of the pitch. 2. In front of the ball (ie. nearer to the opposition goal line than the ball is). 3. There are fewer than two opposition players between the player and the opposition goal line. A player in an of... | [
"This CGP Grey video does a really good job of explaining it all. _URL_3_"
] |
How are major secrets in the entertainment industry (pre-release Marvel movie details, production on Beyonce's surprise album "Lemonade", etc.) kept from getting out and going viral every time? | [
"Non disclosure agreements are pretty much it along with good security. Breaking an NDA can fuck you really badly. Not just financially, but also career wise, it would be very hard to get a job in any field where confidentiality matters if you're known to have broken an NDA before. Basically if you don't want to de... | [
"They do get taken out and the pirates keep hosting them on different servers."
] |
To what degree have animals (specifically interested in birds) been shown to entertain themselves with no external reward? | [
"You might be really interested seeing [this video](_URL_0_) of a crow, sliding down repeatedly a roof just for fun."
] | [
"This is an incredibly complex issue. I can't provide a concise answer which would be meaningful (there are [multiple](_URL_4_) [lengthy](_URL_2_) [reviews](_URL_5_) on the subject of intraspecific variation in voluntary activity), but here are some traits which are correlated to activity levels, or just related id... |
How would the super dense material from a neutron star act if there was much less of it? Let's say mass equal to our moon. | [
"Yes, it would explode. People often say that if you took a spoonful of neutron star to earth, it would weigh 100 million tons or something to that effect. But the gravity of the neutron star itself is what's keeping the matter so densely packed, so it would explode if you somehow managed to remove it from the grav... | [
"I actually read about this a little bit back. They have started to make body armor out of a non-Newtonian fluid called Dilatant. So to answer your question OP, non-Newtonian fluids under the right circumstances stop a bullet and actually perform better than kevlar Source: _URL_0_"
] |
Does aurora borealis and aurora astralis happen on other planets? | [
"On earth, the phenomenon depends on two things: earth’s magnetic field, and earths atmosphere. I’m on my phone, so can’t write the entire process, but basically charged particles are shot out of the sun and then are captured by earth’s magnetic field and funnelled down into the atmosphere at the poles. The visibl... | [
"Ended up reading all sorts as a result of this question because I was extremely curious what a rainbow on Titan would look like. Ended up installing a fascinating program called [Mieplot](_URL_3_) and used the refractive index of liquid methane to try to work it out. I failed miserably trying to use the simulation... |
How do hemispherectomy patients regain functionality in their whole bodies? | [
"This rerouting only is possible for very young patients. I know a teen who had it done and he has incomplete use of one half of his body. So he limps and such. But a baby who has this done will likely be completely fine. Some physical therapy is likely necessary. The young have a lot of neuroplasticity."
] | [
"Hi, this question was asked not too long ago, I recommend you check out this link: _URL_0_ That should answer your question. In short, I believe you would nut suffer from dehydration in the traditional sense, but various other problems arise, which I suggest you explore that link for more info."
] |
Does lack of evidence prove something is false? | [
"Lazy thinkers often say \"absence of evidence is not evidence of absence.\" That's not true, it is *evidence* of absence, but almost never can be conclusive proof of absence. However, it can provide such a compelling case that something isn't true, it would be irrational to believe otherwise. As Stephen J. Gould p... | [
"Before I answer, may I ask who the speaker is for this particular lecture? Or if you have a link for me to listen to? I would like to know where they are coming from in their argument."
] |
How does the audience in big soccer matches end up neatly divided by teams, when the tickets are sold even before the competing teams are known? | [
"The expensive seats (mid-field) are usually sold ahead of time via FIFA/UEFA or whoever is sponsoring the match. Each team gets X thousand allocated in a contiguous block of seating and held in reserve until the actual matchup is known. These are usually then allocated and sold via the club's ticketing system. Car... | [
"Cable TV works much like a radio station: Your cable receiver tune into a certain frequency to find a channel and shows the video stream of that channel. It does not matter if just you or any number of people watch that channel, they all get the same content at the same time. Internet streaming works differently. ... |
why taking antibiotics long term does not lead to antibiotic resistance, but taking them for too short of a time (ie not finishing the prescription) does? | [
"It's like weeding a garden. If you don't get the roots out, the weeds come back. Kill all the weeds and you keep a healthy garden, leave the roots and they come back. But with anti-biotics it survival of the fittest, the most resistant survive the die off and re-populate with a more resistant strain."
] | [
"To understand bleach, you have to first understand color. Colors come from parts of molecules called chromophore. Chromophores work by absorbing a certain wavelength of light. If you are familiar with chemistry, chromophores are just long chains of conjugated double bonds (double bonds that are adjacent to one ano... |
Good examples of correlation without causation | [
"Last time my city got a team into the World Series, all the hotels were packed. This year, in an effort to get our team to the World Series again, our mayor bought up all the hotel rooms."
] | [
"I don't understand what you mean by guilt by association here."
] |
What sort of behaviour was common or accepted among 15th century English peerage that would be criminally unacceptable today? | [
"Well, the Wars of the Roses were in that period, in which you had Nevilles and Percies ambushing each other along the borders, lords rebelling against kings, disorders in Wales, lords obediently passing acts of attainder and repealing attainders passed by the last faction to control the throne (removing titles, se... | [
"Do you have a particular geographical region or time period in mind? You're more likely to get a good answer if you are more specific than \"people in the past\"."
] |
Why do European/Western languages (English, Spanish, French, German, etc.) use generally the same alphabet, but Semitic/Asian/"Eastern" languages seem to have their own individual writing style? | [
"I'm sorry, but the premise of this question seems flawed. Some variant of Chinese script is used by 1.3 billion people. Arabic scripts are used by about 600 million. Devanagari and Eastern Nagari, the two main (closely related) scripts of India have about 600 million users _each_. Slavic scripts about 250 million ... | [
"Alice wants to send a message to Bob. They are very far away. So, she writes a letter and gives it to Chris, who is a very nosy individual. Chris steams the envelope open, reads the letter, and then reseals it and hands it to Bob. If you are Alice and Bob, you probably don't want Chris to do that. So you develop a... |
If affected by caffeine differently, are there other ways to stay awake without caffeine? | [
"If it isn't already in your (or the doctor's) plan - I highly recommend asking to have your thyroid hormone levels checked. Underactive thyroids can cause so many random symptoms to appear and be different from one person to the next. Caffeine is often recommended to be reduced or eliminated if the thyroid is abno... | [
"The roast level just depends on how long and how hot it's roasted. It's like the difference between a rare steak and a well done one. The same bean variety can also take on different flavors depending on its source. It picks up different taste signatures from the soil. How the bean is processed and dried makes a d... |
Why does the change in season seem to make everyone sick? | [
"I'm not sure that changing season does, but when it gets to winter everyone spends more time inside with other people and so infections (common colds, flu, etc.) can spread more easily and more people are sick. Other seasons come with other problems too - e.g. during the spring/summer change pollen is much more ab... | [
"Well i dont sleep good at night time very often, so when i get home from school i crash right away. Im guessing its just based on your body clock and what time you eat/go to sleep. Basically it just depends what your daily schedule is...."
] |
Why do waterfalls form over sheer drops? Instead of eroding a more gradual incline? | [
"If the rock were of an even hardness, that would probably be the erosion pattern. However, most waterfalls form on a hard rock layer situated on a soft one. Once the hard rock is worn through, the soft practically takes relatively no time at all. This forms a plateau then a sharp drop. The hard rock makes sure the... | [
"There are lots of ways for animals to traverse the earth, not to be trite. Addressing your specific example, this wiki. _URL_1_ Indonesia was at one time linked to the rest of the islands in that part of the world, when sea levels were lower due to so much water being bound up in polar glaciers. When the glaciers... |
Relativity: What happens when distinct perceptions on an event yield contradictory results? | [
"What would help you to learn about this (and is one of the big problems of trying to do relativity on reddit) is learning how to do [Minkowski Diagrams](_URL_1_). When you have these down, you can easily see how the overall relationships of events in space-time are laid out, and how they change from observer to ob... | [
"I don't so much think of it as an evolutionary thing. There's really no benefit to being confused. It comes down to computing power. Your brain just takes a minute to recall old information/piece together new information to develop an idea of where you are and how you got there. I'm currently in flight school and... |
Did ancient weapons (Bows and Arrows, Swords, Maces, etc.) that appear worldwide come from the same single origin, or were they developed separately multiple times? | [
"Not addressing \"swords, maces, etc.\", but with regard to bows and arrows, there have been several good threads: check out this FAQ section: * [Origins and dispersal of bow & arrow technology](_URL_0_) The posts have been archived by now, so if you have followup questions for any of the users, ask here & mention ... | [
"First, the common cold and the flu (rhinovirus and influenza virus, respectively) are two distinct pathogens, which cause different diseases. Second, there are animal reservoirs for the flu. We share common airway receptors with birds, pigs, ferrets, etc [sialic acid alpha 2,6](_URL_0_), and as a result, the infl... |
When you have cold feet and put them in hot water, why do they have a "freezing" feeling for a while? What causes it and what is it's purpose? | [
"When you're cold, blood vessels around your body begin to contract to keep your more important organs functioning (this is why you can lose a limb from frostbite) When your feet warm up quickly, blood vessels rapidly expand causing a uncomfortable freezing/stinging sensation from the stretching that occurs in the ... | [
"I believe its nucleation. The rough surface of the ice provides a huge surface area for bubbles to form on. The warm soda melts the outer edge of the ice, leaving it smooth and rapidly reducing the area for nucleation. So the fizz subsides fairly quickly."
] |
why is it not possible that dinosaurs had beaks that didn’t fossilize? | [
"Many dinos did have beaks, and those beaks fossilized with them. That said, even if no part of the beak remained, it would still be obvious that the had a beak, as we'd be able to see it in the skull structure, the same way we find feather and muscle attachment points on the other bones in the body."
] | [
"Your question presupposes that the behavior of pinching cheeks is an evolved behavior. Have you considered it might be a culturally learned behavior?"
] |
How to spot a micromanager and how to deal with them. | [
"Micromanagement means trying to control every little detail rather than letting people actually do their job. For example. if your job is to make coffee, and rather than just letting you make coffee your boss insists that you use specific spoons, measure out the coffee grounds down to the gram, use water that has ... | [
"[Disciplinary Actions against Michael Platt, M.D. ](_URL_0_) He isn't a doctor anymore due to \"negligence, incompetence, and inadequate record-keeping\". So I'm just going to disregard his \"alternative medicine\" views on fibromyalgia. It is bullshit."
] |
I am an avid runner and want to know if there is any evidence that stretching can help prevent injuries? | [
"The New York Times seems to address this question annually. Here's there [most recent take](_URL_0_), in which the author equivocates: > A slowly growing body of science suggests that each group has some evidence backing it up, although reliable information about stretching remains hard to come by, in part becaus... | [
"> Medical doctor Donald Unger crackedthe knuckles of his left hand every day for more than sixty years, but did notcrack the knuckles of his right hand. No arthritis or other ailments formed in either hand, earning him the 2009 Ig Nobel Prize in Medicine, a parody of the Nobel Prize. Source:_URL_0_"
] |
What methods and techniques were used to begin construction of a rope bridge before the advent of aviation? | [
"Once you can get one line across, even if it's just a string, you can use that line to lead across a thicker line. Repeat until you have a line thick enough to begin the construction of the rest of the bridge. This is true not just for a rope bridge, but *any* bridge at all. The first bridge across Niagra Falls wa... | [
"**If you're new to the thread, please don't post the Mythbusters episode again. Mythbusters is entertaining but it's not history (or more specifically, it's not historical proof of anything.)** The short answer is no, not that we know of. /u/davidaop, our pirate expert, and I have both answered [questions about th... |
What is the best way to guess a random number? | [
"The other answer assumes a uniformly distributed number and is correct under that assumption. It is worth pointing out, however, that due to superstition, a human selected number can exhibit bias. In particular, if someone tells you to guess a number between 1 and 10, in my (annecdotal) experience 7 is chosen more... | [
"I saw one say to the audience to shut their eyes and put their hand out in front of them and he told them a strong wind was blowing their hand upwards. The people who’s hands started to rise were the ones he selected. 100% never works on a skeptic."
] |
Any takers for AJP Taylor's views on Hitler? | [
"In the Australian High School System we are directly taught that Hitler was an opportunist and cunning man who was able to exploit all the situations available to him. I would assume this is because of AJP's legacy. Wasn't he a historian who often took a different line of thought to that of the historians of his ... | [
"I wrote a bit about the possibility of a Japanese invasion of Australia [here](_URL_1_) for a few more bits about ANZAC hilarity. For an answer about imperialist attitudes, I wrote one [here](_URL_0_) also."
] |
Why is an elevated heart rate bad for you when it's due to nerves/anxiety but good for you when it comes from exercise/activity? | [
"Very much so. The sudden jump in heart rate and strain on the cardiovascular system is what can cause acute myocardial infarction( heart attack) along with stress. The endorphins released during exercise is what is positive for your body along with the gradual rise, and fall, of heart rate."
] | [
"I'm sorry that I'm no expert, but I remember reading about this the last time a similar question was asked: _URL_0_ Basically, you percieve time faster after your run because of endorphines released during the work out, which means that the music seems slower. This is apparently also why a lot of rock musicians pl... |
Language requirements for advanced history degrees... | [
"Well, if you want to study the Vikings, you actually need to learn the languages that the texts about them are in. So we're talking Latin and Old Norse, not Danish, Swedish, or Norwegian. It seems like you're in an Anglophone country, so whether you need to learn the modern languages as research languages probably... | [
"hi! you may be interested in these recent posts * [In the Netflix series \"Marco Polo,\" Marco Polo, a Venetian, has a relatively easy time communicating with people in the Mongol court. Would actual western traders be able to communicate effectively without translators? If so, how?](_URL_0_) * [In Netflix's Marco... |
How do (did some) hunting tribes survive living of an all-meat-diet (like some Inuit tribes)? | [
"They eat a lot of things like organs, fat, and bone marrow that contain more nutrients than the normal cuts of meat you'd find at the grocery store. It's entirely possible to meet your nutritional requirements on a totally carnivorous diet if you're willing to eat the \"gross\" parts of animals."
] | [
"Here are the [EPA/FDA recommendations](_URL_0_) for women who are pregnant, may become pregnant, or are nursing, as well as children: > Eat up to 12 ounces (2 average meals) a week of a variety of fish and shellfish that are lower in mercury. > > Five of the most commonly eaten fish that are low in mercury ar... |
Why is human skin so thin compared to seemingly every other animal? | [
"Instead of asking \"why\", first ask \"Is human skin thinner compared to other animals?\" If you ask \"why\" first, you may already be asserting a false pretense and your question itself may be invalid."
] | [
"Evolutionary adaptation and natural selection. You ever spent your entire life wandering around rocky fields? It would make sense that the animals with the harder covering for their feet would suffer less infections and then be less likely to die off."
] |
Cultural links between Anglo-Saxon England and Germania | [
"_URL_3_ _URL_4_ I've written on this topic before, I'd be happy to field any follow up questions you have."
] | [
"Just to add an extra question. Would the beginnings of the industrial revolution, starting in Britain, have had a place in the role?"
] |
Why does the electron's charge stay constant even under relativistic velocities? | [
"Electric charge is a relativistic invariant. The electron has a four-current density J^(μ) = (ρc,**J**), where **J** is the three-current density. The electric charge of the particle is simple the integral of the charge density over space: Q = ∫ ρ(**r**) d^(3)r, over all space. But this just equals Q = (1/c) ∫ J^(... | [
"Where are you getting your 2.5 x 10^-4 m/s from? That's likely your issue. Take for example the rough copper wire calculation done in wikipedia [here](_URL_0_). They do a \"reasonable\" copper wire and come up with a drift velocity of ~10^-5 m/s, so maybe that's where you got a number like that. EXCEPT, they assum... |
What do Box Tops actually do? | [
"So, from what I've read, the box tops are collected by the schools that participate, and through the advertising budgets of General Mills and other similar companies, they distribute money back to the schools. Basically, a reward for using their products. If I'm wrong, someone please correct me."
] | [
"Round here (Telford, UK) the local one stores salt for de-icing roads in winter. There's another one around which has a riding school in it."
] |
How does a cotton candy machine work? | [
"The sugar is heated up until it melts and becomes liquid, and the liquid sugar is spun around in a colander with tiny holes in it. When it hits the air it solidifies into little strands of sugar glass."
] | [
"Newer ones might be electronic. The original style would have a recording on a sound cylinder or disk, which would be wound by pulling the string. Generally, much like a record player. A number of the older ones basically are tiny little record players."
] |
How did we go from WWI's plane-with-a-gun-attached to WWII's specialized and advanced warplanes? | [
"I was actually about to post a similar question on WWI aviation but if it's alright I'll just post it here to save space: When planes began to be used as weapons of war was there any ethical opposition to this by military/civilian officials?"
] | [
"Its a common thing that large office building such as skyscrapers often are build just before or during a depression, the same was said during the 2007/8 global downturn. _URL_0_ The reasons for this is mainly your point 2, building buildings takes a long time, sky scrappers especially, the empire state building s... |
"The higher the probability, the higher the entropy and the lower the information content." | [
"> After all, it had been Wiener who discovered a precise mathematical definition of information: The higher the probability, the higher the entropy and the lower the information content. Er, I think it was Boltzmann who came up with the definition and it was really Claude Shannon who popularized the concept. No m... | [
"Imagine you are a travelling salesman, and you spend most of your time driving from place to place across the country. Today you need to get from Denver to Dallas. You could use High Level Navigation. You know how to get from Denver to Wichita, Wichita to Oklahoma City, and Oklahoma City to Dallas. String those to... |
How come all these amazing breakthroughs I see in articals such as cancer treatments and battery advancements just seem to disappear and never to be heard from again | [
"Because by adding the phrase 'amazing breakthrough' to an article, they've made you more likely to read it. But in most cases the article either describes an idea someone had that may or may not work and hasn't been tested yet, or a single step in the right direction on a path with millions of steps to go before t... | [
"Phones are already expensive. Using the absolute best parts available at the time to create some überdevice would cause the price to skyrocket and only a select few people would be able to afford it. It would probably cost the company more money to put something like this together than they could earn by selling i... |
What's the minimum deceleration space to survive a free fall? | [
"I'm not sure if these values are correct, but I'm going to try to give you an answer. Let's suppose that we don't want the faller to be exposed to more than [10 G = 98 m/s^2](_URL_0_). [Human terminal velocity is 56 m/s](_URL_2_). Then v_f^2 = v_0^2 + 2ad 0=(56 m/s)^2 + 2 (98 m/s^2 ) (x) [Solving for x](_URL_1_),... | [
"Math, and the laws of Gravitation. We know that a certain amount of Mass will exert a certain amount of gravitational effect. From there we can extrapolate the Delta V for just about any target. As long as all the designers are using the same units, that is."
] |
Why have we always made robots out of metal instead of other materials? | [
"Metal is durable and easy to shape. Wood really isn't. You could carve wood into a certain shape, but it would take a lot of time and effort and frankly it's easier to just pour molten metal into a mold. Wood is also easier to damage, and it's susceptible to rot. Of course, steel can rust but that's a slower proce... | [
"Specializing helps with optimization. Cows can't eat meat, but their teeth and multiple stomachs are ideal for eating grass. Humans have to have sharp teeth for meat and grinding teeth for plants and our digestive system is inefficient at processing plant matter. Versatility is obviously useful, but there are trad... |
What is an "8-inch mix"? | [
"Without more context I believe you are talking about a 7-inch mix which is a hold over from the days of vinyl records. Albums were on large records with lots of tracks. Single songs were sold on smaller 7-inch records. Sometimes the same song would be released as a single and also as part of an album. Often there... | [
"Rotated through MedOnc. We collect data for 5, 10 and 15 year benchmarks for most cancers to get a vague idea of the progression of a type of cancer, not to tell people how long they’ve got. One example of its use is to compare treatment modalities e.g. 5 year survival of women with p+e+her+ breast cancer on letro... |
How does whistling work? | [
"Yer not alone in askin', and kind strangers have explained: 1. [ELI5: Whistling ](_URL_6_) 1. [ELI5: How does whistling work? And how is it different from blowing? ](_URL_0_) 1. [ELI5: How does whistling work? (Wind/air pressure to sound with whistles, bottles, or lips.) ](_URL_4_) 1. [ELI5:How does whistling work... | [
"Because water molecules are polar (have positively and negatively charged ends) so the oscillating EM field affects those molecules, but molecules that comprise air (O2, N2, etc) are non-polar, so the oscillating EM field doesn't affect them."
] |
Why do so many books have two to three blank pages at the start? | [
"Imagine I took a standard piece of paper. I could fold it into 4 pieces, then cut the top and bottom a bit, staple it, and have a small book. This is called a signature. They can be as small as 4 pages, or much larger. A book is typically made up of several signatures. The result is, I can take two 4 page signatur... | [
"Imma answer your question, but first let me tell you about this time I watered the lawn on a warm july afternoon, there were clouds in the sky and childrens laughter.... ok seriously, who knows, maybe they just like to hear themselves type, or create an emotional connection to the recipe, perhaps they are just kil... |
How second-hand smoke is worse than smoking yourself. | [
"It's not worse for you that smoking surely; it's the same smoke with *less* chemicals in, some of them having been absorbed by the smoker. The problem people have with it is that they don't get a choice about breathing in second hand smoke, and people smoke around kids and things."
] | [
"This is more of an opinion or discussion question than a concept you're looking to have explained. Not really a topic for ELI5. Maybe /r/askreddit"
] |
Does π start with two identical decimal sequences? | [
"We don't know and it'll probably be extremely difficult to prove this in either direction. To show that no such n exists would basically be implying some property on the continued fraction expansion of π, which is certainly going to be complicated, given that we currently know of no pattern in π's continued fracti... | [
"As for the actual process, it'll depend on the specific tech and region. Dispersion happens, as does independent development. The thing to remember, though, is that we can't assign excessive significance to similarities in things like weapons. While there's a plethora of ways to depict a sun god or the number 3, t... |
When I pee in a plastic bottle and put the cap on, why does it get sucked inwards over time, rather than releasing gas and making it more "full"? | [
"It's about hot liquids becoming less dense when they cool. This same impact can be seen by filling a bottle with very hot water then cooling it."
] | [
"The suction effect is caused by a difference in pressure. The surface of the water is presumably at atmospheric pressure, which is thus the largest possible pressure difference. In other words, the atmosphere pushes down on the water, which is then pushed up through the straw because of the pressure difference bet... |
If herd immunity exists and is important, why don't more adults get vaccinated? Not all vaccines give life long immunity. | [
"I'll try to explain it. I'm a doctor but my English is not perfect. Some vaccines don't need to be repeated, and some does. This is because some give immunity for life (like hep A or Hep B) but other like difteria/pertussis/tetanus vaccine needs to be repeated. This is particularly important if you have little kid... | [
"Epigenomics is the simplest of answers, you should read about it, I think you'll find it interesting. The wiki page is a nice summary. It talks about processes that affect the translation/expression of our DNA. Simply put having the same DNA, as the twins do have, does not mean those genes that are key in developi... |
What makes some people more susceptible to be addicts than others? | [
"This really isn't an ELI5 topic/question. It seems that you don't have a general answer to your question yet, and ELI5 is here to break down a general answer into understandable terms. /r/askscience should be a bigger help."
] | [
"I recall once watching a short documentary on the golden ratio that posed this question. If I remember correctly the faces that were seemingly more attractive had closer similarities to the golden ratio and were also more symmetric. In general humans seek out symmetry. I unfortunately am not 100% sure as to why bu... |
Why Did Gran Turismo on PS1 look so good but other games looked terrible retrospectively | [
"It’s all about time and experience. GT was the third racing game the company developed and care out over 2 years after PS1 was released so they knew how they were able to get more out of the console. You’ll see similar outcomes with franchises when you compare the first on a console to the last. Yes, GT wasn’t the... | [
"Imagine that someone hands you a sketchbook filled with drawings, and tells you to flip through them quickly to give the illusion of motion. That's displaying a video. Imagine that someone hands you a blank sketchbook and a pencil, and tells you to flip through the pages and draw exactly what he tells you to in re... |
Why do vacuums smell weird when they're running? | [
"They have motors with carbon brushes. The arcing at the brushes makes ozone and a burning smell. Plus the dust which leaks out has a funky smell."
] | [
"[This image](_URL_1_) is not a 747, it's a Fokker - but you can see on this type of aircraft how reverse thrust works on jets much more clearly than on a 747. The Fokker deploys buckets behind the jet exhaust. These buckets reflect the exhaust forwards, instead of the normal mode where jet exhaust goes backwards. ... |
What is the probability distribution of the number of kids my wife would have to give birth to so we have at least one son and at least one daughter? | [
"You can assume your first child is male. If it's female, you can swap the meaning of the words \"male\" and \"female\" and you get the same exact situation. So we can assume the first child is male anyway. Your second child can be female with probability 1/2. So you stop at 2 children with probability 1/2. Or you ... | [
"It doesn't appear to be a method. More like a teaching aid. For example, the teacher tells the students they are expected to know the products of any number inside the circle and any number outside the circle. Then the class can play a game where they are quizzed at random. \"4x12\" \"8x4\" \"5x6\" The fact that i... |
Why did the ruins of Rome and Greece become "ruins"? | [
"Long term exposure to the elements with no one repairing the structure and in some cases people actually breaking up and taking stone away for building materials."
] | [
"Costs money to build and maintain the facilities, some countries don't feel like taking on the burden of that cost."
] |
Why don't car batteries do well in the cold? | [
"Batteries depend on chemical reactions to work...when a car battery is left in the cold, that reaction slows down due to the cold causingthe battery to not deliver as many amps to the starter which uses quite a bit of current. By the same token, if you put batteries in the freezer, that too slows down the chemical... | [
"the change in velocity and amount of force used to move your vehicle would use more energy than simply traveling on a flat surface at a constant velocity"
] |
Any dangers relating to solar panels? | [
"The photovoltaic installations I know about don't have batteries. They store energy in the electricity grid by selling excess power. IMHO the biggest danger would be falling off the roof while installing them, or being sued if somebody else falls off the roof."
] | [
"I wouldn't think so, but to be honest I don't believe there really wouldn't be much benefit over what we have. Apart from the reasons znerg (clothes, hair, and layers of dead cells on top of your skin) brought up, we use a LOT more energy than plants do. We have organs and muscles that beat/expand/move, we exercis... |
How does water pass through the stomach without mixing with the stomach's hydrochloric acid? | [
"When the hydrochloric acid passes from the stomach into the small intestine, it's neutralized by sodium bicarbonate released by the [pancreas](_URL_0_) into the duodenum. So really, it would mix, but it would be neutralized by the time it gets into the intestine, and the stomach would keep producing HCl."
] | [
"Here is a good video on what you're talking about: _URL_0_ Basically the esophagus and the trachea are separated by the epiglottis. So when stuff goes down the wrong tube it means your food went down your trachea instead of your esophugus."
] |
Can someone please give me a basic rundown of why Serbs, Bosnians and Croats killed the shit out of each other for so long? | [
"This has previously been discussed [here](_URL_0_). I advise you to use the excellent search function before you post a question."
] | [
"Taliban - Tribal alliance from Afghanistan. They want control of Afghanistan/Pakistan, as that is the territory they are present in. ISIS/ISIL - Product of the Syrian Civil war, their organization is attempting to create a unified Islamic state throughout the Region they are present in. Al Qaeda - International or... |
Subsets and Splits
No community queries yet
The top public SQL queries from the community will appear here once available.