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Why is it so hard to hear lyrics right?
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Often sole audio queues are hard for the human brain to interpret as a majority of our communication is at least two fold: auditory and visual. Without lips to follow it’s super hard to know definitely what is being said, especially when the lyrics are ambiguous or muddled in the first place. Brain Games did a segment ...
Other
Why is graphene so much more resistant and everything better than graphite if graphite looks like a bunch of graphene stacked? Also, never thought about it until I searched for the structures, where are the 4 carbon bonds on both graphene and graphite structures?
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(to answer/u/ImmortalityMadeFLesh question): Carbon atoms have several ways to form a molecule, and among them are graphene and graphite. (They are quite a lot actually) [on this picture]( URL_0 ) is represented four of them: graphene (up left) - graphite (up right) - carbon nanotubes (down left) - and fullerene (down ...
Chemistry
How come I'm still dehydrated eventhough I drink a lot of soda, coffee and tea which contains water?
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Even though the caffeine in Tea, Coffee and some soft drinks is a diuretic there should still be enough water within the drinks to offset any caffeine effects. It could be worth looking at underlying health issues. Diabetes causes increased urination if you have sugary drinks. So maybe assess the colour of your urine. ...
Chemistry
What does 100% air humidity mean?
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100 % air humidity means that there is as much water vapor in the atmosphere as possible. If you add more, it will start to condensate into raindrops. 100 % humidity does not mean that 100 % of the air is water vapor. How much water there may be in the atmosphere varies with temperature and what other stuff there is in...
Physics
How can CEOs of large corporations run them into financial ruin, but get super-wealthy in the process? Why are they not paid based on company performance?
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Ah, one of the tricky ones. Well, CE's are paid based on company performance however the metrics used focus on quarterly results which encourage exec's to sacrifice long term stability for short term profit. There's another undesirable effect at work here that magnifies the problem. Top flight CE's are paid largely on ...
Economics
Why do burns hurt so bad when the injury is not actually that severe, and why does only slightly cooling it provide such immediate and complete relief of the pain?
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There is an interesting bit of neuroanatomy tied up in this question. A few things happen when you burn yourself. One is that your neurons actually sense heat as your tissue is heated. A second is that cells that are damaged or destroyed during the process start leaking their contents or otherwise emitting compounds no...
Biology
what is ego death and how does it actually feel?
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Ego death is most commonly known in the context of a deep acid (LSD) trip. What happens with this powerful psychedelic is that at a high enough dose, you literally lose your sense of self. I never got that far, it terrifies me. Think of it this way, right now you're reading what I am saying, you're thinking about it, a...
Psychology
Why does a laser pointer not work with a power point display?
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Technically it does, just not very well. I assume that you're referring to a presentation that you're projecting onto a screen. The projector is sending light to the screen which bounces off and into your eyes. The light from the projector has to be pretty strong to be seen in a bright room. So, when you shine your las...
Physics
How do geodes form beautiful crystals on the inside, while still being boring on the outside? How do you spot one?
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I don't know how they form, but I know how to spot them. They are much lighter than a solid rock, sometimes even to the point of floating in water. So, if you are looking in an area where they are common, look along riverbeds and look in places where lighter rocks are likely to gather.
Other
Is there perfect amount of mold on blue cheese, or any amount is fine? Is it possible for it to grow too much mold, to point where it is spoiled, or is drying too much only way for it to spoil?
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There is a perfect, or at least a range of mold that is good for the cheese (for human taste). Also only some kind of molds are tasty and safe for us. Some other are not tasty and dangerous.Yes, if the cheese maker is letting too much mold growing in the cheese, it will spoil. The cave, temperature, moisture, everythin...
Biology
Where does influenza come from and why does it come every year?
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Influenza is endemic. Not sure about its origins - it's been with us for a long, long time. It's constantly circulating in the community. During colder months it tends to be worse because people tend to congregate inside in groups more than summer, when such groups are more outside. So it doesn't actually go away in su...
Biology
How did the Antikythera machine actually work?
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There's a fantastic YouTube channel where a guy is re-creating the machine by hand using only tools and methods available at the time. It's called Clickspring. He goes into a lot of how the machine works. Basically, all celestial motion is circles, and those circles happen at different rates. The earth rotates on its a...
Technology
Why are submarines so hard to track with modern technology?
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It is mostly just a factor of how damn big the ocean is. Even a surface boat is likely to avoid detection simply because there is so much ocean that it can be hard to find it. Also, submarines have a lot of the same sensor equipment that other ships do, and other ships generally aren't trying to be as stealthy as subma...
Technology
How is an i7 processor faster than an i3 if the clock speed is almost the same?
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**Short answer**: the difference is in how much your processor does in those clock cycles. **Long answer:** The amount of instructions your processor handles each second depends on two factors: * Clock speed: the speed at which the processor components switch state * Instructions per Clock cycle (IPC): the amount of in...
Technology
Why do people riot when Milo Yiannopoulos shows up to speak?
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Other answers have sufficiently pointed out why Milo offends people. Even so, to *riot* is a level of response above protest. I assume this question is in direct response to the Berkeley riots. In that case, it should be noted that according to Redditors claiming to be from the Berkeley area, the riots have been escala...
Other
why are there so many different currencies?
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Currency developed as a way to trade with people without having to exchange goods every time. Each civilization/culture comes up with their own currency, ranging from precious objects like salt and gold to government backed standards like coin and paper. Today, $1 in the US is still $1 all over the world, but that can ...
Economics
How do wind instruments work?
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Sound is produced from oscillation (moving back and forth). To create a sound from blowing, you need to cause some part of the instrument to oscillate. Blowing over or between a reed will cause it to vibrate up and down, blowing into a brass instrument's mouthpiece produces vibrations from your lips, and in a flute, bl...
Physics
Why do two thinner coats of paint typically last longer than one thick coat?
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When the paint dries it starts on the outside and dries inward. Also when it dries it changes size a tiny bit. On a thick coat the outside is completely dry while the inside is mostly wet, so when the inside dries it pulls tension on the outer portion, making it easier to crack later.
Chemistry
Why do some countries use the USD despite them not being connected to the US? Ex. El Salvador
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Printing your own currency is costly and opens you up to currency manipulation if the government is too inept. In some poorer countries with a history of governmental instability it's much easier to use a highly stable currency like the US Dollar. Yes you lose some currency sovereignty, but you also avoid falling into ...
Economics
How does a 1920x1080 resolution screen display media in lower resolutions, such as 1600x900, when the ratio between resolutions isn't a whole number?
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It interpolates the difference. There are many, many techniques to do this - some are super dumb like just removing every X pixel. Others are very sophisticated and involve looking for patterns or maintaining certain colours where they produce a high level of contrast (on the assumption that this is likely to be visual...
Technology
With Doctors and nurses being in such important positions, why are their shifts so long?
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The idea is that a lot of mistakes can be made handing off the care of a patient to another person. Too many times Doctors and Nurses would forget something important to tell the next guy. The kind of things they needed to tell were too complicated to be covered by a simple check list. So they thought they would minimi...
Other
How are companies like Uber and AirBnB among the most valuable private tech companies if they don't own much in the way of property (cars, houses, etc)?
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If every single employee except one left, every piece of real estate, equipment, vehicles, etc., and every bit of inventory of Coke were wiped out tomorrow, how much would the company be worth? Answer: probably well over $1 billion. Coke in this example would still all of their contracts, all of their IP and trademarks...
Economics
What causes our perception of time to change when we’re actively doing something compared to when we’re not doing anything?
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When you are actively doing something that makes your mind preoccupied so you aren't focusing on the time or how long something would take. Alternatively when you are doing nothing and time seems to stretch on and on it is because you have nothing to focus on so you become aware of how long a minute actually is.
Biology
If any distance can be halved, at what point do you stop touching something?
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You're never touching anything - you are just as close as possible to it. The sensation you feel is effectively the force of the atoms "pushing back" against your fingers (and your fingers' atoms "pushing back" against the atoms in whatever you are touching). Think of it a bit like how two magnets push against each oth...
Mathematics
How exactly does currency “move” between banks, individuals, companies, etc. when processed electronically and without the use of any actual physical currency (cash)?
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Ahoy, matey! Yer not alone in askin', and kind strangers have explained: 1. [ELI5: What happens when money is digitally transfered from one bank to another? Is the money later picked up to be stored there? Or is there some sort or digital I.O.U. involved? ]( URL_1 ) 1. [ELI5: Electronic Funds Transfers ]( URL_0 ) 1. [E...
Economics
How can nuclear fussion and nuclear fission both produce energy?
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If you imagine the amount of energy that fusing an atom into "the next" atom gives off, you'll find a lot for the light elements, with reducing payoff as you get heavier, until you hit iron. Once you hit iron, it goes negative. Fusion stops giving off energy but instead requires energy. It is for this reason that all a...
Physics
What part of your Appendix bursting is actually dangerous to humans?
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Uh, all of it? You don't want your organs to burst. Pretty much any organ, if it bursts, is going to be life-threatening. Regarding the appendix specifically: for one thing, it means that the blood and lymph vessels that supply the appendix are now severed and spilling blood/lymph into your abdomen. For another thing, ...
Biology
Can't you simply guess a PaySafeCard pin since it only contains numbers?
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In principle, yes. But how many valid PINs exist at any time? Let's be very optimistic and guess 1 billion. There are 10 quadrillion possible 16-digit PINs, so you have a 1 in 10 million chance of guessing a valid PIN. That puts it in the same ballpark as guessing the winning lottery numbers, and there are probably far...
Technology
How can Google display and monetize things like article snippets and images under copyright?
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Copyright laws allow for certain types of “fair use”, such as short clips from videos or songs to be played. A great example would be a Youtuber showing clips from somebody else’s video (or a news report) and adding their commentary about the other video. I’d imagine partial text from an article or a reduced-size photo...
Technology
Why haven't Saturn's rings coalesced into much larger moons?
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Basically, the junk that makes up Saturn's rings are too close to Saturn. They do occasionally clump together and start forming masses, but the gravitational forces exerted by Saturn are too strong where they are, and the clumps of dirt are squished and stretched until they fall apart. We actually even see that the rin...
Physics
If University of California gets 13% of revenue from student fees, but spends 14% on financial aid, why can't tuition just be cut to zero?
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So you’re saying that students cost 27% of their revenue... Why can’t they use the 14% of X total revenue to pay 27% worth? It might be helpful to work with real numbers. Also financial aid typically comes from banks and the govt (plus various scholarship sources). So I’d question when you say it “spends”
Economics
why countries with weak currency don't remove multiple zeroes off their money to make it worth more?
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It happens, but it doesn't make the money worth more. It is only a cosmetic change that turns larger numbers into smaller ones, but it does not change anything about the underlying value. Turkey did just that in 2005. They replaced all their banknotes with new ones that had 6 zeros less on them. 1,000,000 old Lira woul...
Economics
if you're standing on the back of a truck headed North at 100 mph, and you throw a baseball South at 100 mph, would the baseball appear to fall straight down to someone watching from the side of the road?
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Yes. Speed is always relative to some point of reference. To someone standing on the truck the ball shoots off against the direction of travel at high speed. To someone stationary near the point where it's thrown it falls straight down. [Here's Mythbusters doing this experiment with a soccer ball fired from an air cann...
Physics
Why most of round trip tickets are cheaper than one way?
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Domestically they're not. One way is usually a bit over half as much as a round trip flight. International is a different story. If an airline flies you into a country and then that country refuses to allow you to enter, then *regardless of why you were refused entry* the airline needs to pay to fly you back. There are...
Economics
Why do colors disappear when you zoom in with a microscope?
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In order to see something with a light microscope, you need to have a very, very thin cross-section. It has to be thin enough for light to be able to pass through it (for the most part). Otherwise, the image under the microscope would appear opaque or black. But a small cross section means that there's not really that ...
Physics
Why does soap smell good but taste bad?
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There are a few reasons, but in my opinion one of the main reasons has to do with evolution. Many things found in nature that are alkaline (having a pH higher than 7) are poisonous to humans so naturally we have evolved to find these tastes repulsive. Since soap is highly alkaline, it tastes bitter.
Chemistry
Why do very light objects take a great deal of force to throw, like very heavy objects?
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because of air resistance. a moving object has energy which is a product of its mass and speed. when the object travels through air, it loses some of that energy in order to push the air out of the way. because of its low mass a light object has less energy and runs out of it more quickly than a heavy object.
Physics
Why does in private browsing let you view more articles on a website that restricts you to a certain amount of free articles per month when you've gone past the limit of free articles?
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Before I answer this, let’s first answer the question how websites know you’ve read a certain amount of articles in the first place. They do this through a method called caching. In simple terms, it is somewhat of a temporary storage in your computer so when you visit the website again, you don’t have to request everyt...
Technology
How sports are able to keep such high viewership without any change while esports games need to change constantly to stay relevant?
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Video games exist in a consumer bubble. Sports don't. Sports don't change. Sports don't get re written, or replaced. You can't change physics. And to get good at a sport athletes spend hundreds of thousands of dollars and for some sports their entire lifetime getting good at it. Then take a new game. It's going to be r...
Other
What are the root causes of anxiety disorders?
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Both. Both is generally accepted for a majority of diagnosable mental disorders. It’s anxiety disorders, your body gets stuck in a pattern of overreacting to stimuli. You can have a genetic predisposition to be more anxious or to have a low threshold for anxiety. Couple that with some environmental stressors that push ...
Biology
Can anyone explain to me the chain rule? I'm kinda doing some self study ryt now, and i'm having a hard time with it. I think i already have a good background with the basic rules, but i am confused when some problems contains mix rules: < <
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the chain rule is something you use when you want to differentiate "difficult" (nested) equations. you can use it to calculate (x+1)^3 without having to expand it into x^3 +3 x^2 + 3 x + 1 this is one of the easier examples, when you're faced with sqare roots, trigonometric (sin/cos) or exponential functions it is ofte...
Mathematics
Why, when you start laughing, every other joke, as silly as it may seems in a normal context, seems absolutely hilarious?
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The part of your brain that makes you laugh has an activation threshold, but once it's active, well, it is easier to keep it active. Think of it like turning on a car with an half-dead battery: hard to do, but once it is running, it keeps going. It's actually like this with many other things, many other moods. Think of...
Other
- Why are there unsolved mathematical equations? Who wrote them and how do they know if they are solvable or not?
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So...you should note that mathematical problems and mathematical equations aren't inherently the same thing. An equation is basically just two sets of algebraic quantities that have an equal/greater than/less than sign between them. Some of these equations are inherently not solvable because they have self-contradictor...
Mathematics
Before phones were popularized, how were the police informed of a crime taking place?
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Walking to the sherrif's office/police station and letting them know. Some areas also had police call boxes (Yes, like the Doctor Who thing) in high traffic areas like parks that would connect you with emergency services, in America at least you can still occasionally see call boxes around although I've seen more fire ...
Technology
Why do streaming providers supply different content to different countries? Can't they just provide the same content to everyone?
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Different countries have different laws in regards to content shown, tv regulations and licensing rights. Netflix US has Arrested Development S5 but Netflix AUS doesn’t due to Foxtel having first airing rights. Some programs are banned from certain countries for religious reasons or what is portrayed culturally. While ...
Other
What's the difference between white and brown sugar, and why does more brown sugar make cookies so much softer?
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White sugar is brown sugar after being processed to take molasses out of it. Originally, brown sugar came first, but most commercial brown sugars are actually made from adding molasses back in to the white sugar, rather than just leaving it in its first stage. Probably because it's easier/cheaper for a company to get a...
Chemistry
Why are metals attracted to magnets?
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**tl;dr - electrons are little magnets, and materials are magnetic based on how their electrons and atoms are arranged** Electrons are magnetic. They have a quantum property called intrinsic magnetic moment, which makes them act like very small magnets. Atoms *can be* magnetic. Electrons in atoms tend to group in pairs...
Physics
How do speakers perfectly recreate the specific timbre of different sounds, like human voices and instruments?
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Three parts to the how: 1. The microphone that records voices and instruments (like an orchestra) is very similar to a (very small) speaker, and functions in reverse: the air vibrations push the cone and it creates electromagnetic oscillations. The EM oscillations are amplified and then sent to speakers, which convert ...
Physics
Why do nosebleeds happen out of nowhere?
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On the inside of your nose you have blood vessels very close to the surface. For a variety of reasons some may be weaker then others. High blood pressure thru exercise, and even diet can raise your pressure just enough to make it burst. There are also medical reasons and nose bleeds can be a symptom.
Biology
How do powerline adapters work? What is the connection between powerlines and networks?
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The power lines in your house are just copper (usually) cables which are designed to carry mains voltage to power devices in your house. While that's what they're \*designed\* to do, it doesn't stop them carrying other kinds of signal as well, so what a powerline network adapter does is to convert the network traffic i...
Technology
What is the difference between different soaps?
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If you'll forgive me the conceit of quoting myself: > Because removing dirt, grime, and oil isn't the only characteristic you want, depending on what you're cleaning. Various kinds of detergents/soaps have secondary characteristics, and which one is good for which task is largely dependent on those secondary characteri...
Chemistry
How do rotation matrices work in computer graphics?
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If you have some time, I highly reccomend watching [3b1b's series on Linear Algebra]( URL_1 ). At least watch just [the video on Linear Transformations]( URL_0 ) . Which explains why transformation matrices look the way they do (including rotation matrices). The rotation matrix tranforms a vector (x,y) by rotating it θ...
Mathematics
if I place both waters into a bucket from where the two oceans meet but don’t mix, why do they mix just fine in the bucket?
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The idea of "two oceans meet but don't mix" is more or less a myth. Most of the pictures of this you see on the Internet are at rivermouths or headlands, where a sharp contrast between water types is visible ... but it mixes away pretty quickly. Tom Scott did a video on this recently. URL_0
Chemistry
Why is the production of iron atoms a sign that a star is dying?
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A star is big and shines bright. Most stars have hydrogen, element #1. Stars are so big and strong that they can squeeze four hydrogen atoms together to make element #2: helium. When stars fuse atoms together, usually it releases energy that makes the star shine bright. The star keeps doing this and they can make all s...
Physics
Why is there demand for stocks that don't come with dividends?
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"is there any point in owning a share that doesn't pay dividends besides the possibility at selling it for a profit?" No. If a stock doesn't pay out dividends, it's called a growth stock, which is a stock intended to keep your money liquid and hopefully appreciate in value. The company gets the initial IPO. The thing a...
Economics
Why/how do our eyes "lose focus" and get blurry? What's happening?
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Basically it takes effort to focus your eyes, when you gaze off into the distance, not really looking at anything, your eyes realize they don't have to do work, and get a bit hazy. HOW this works is a bit more interesting, your eye lens is flexible, (even though you might have thought it was hard in that cow eyeball yo...
Biology
How do stocks go up or down?
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Its actually super simple. Person A wants to sell his stock. Current price is the last time someone traded that stock, lets say $25/share. Person A puts his stock up for sale for $26/share. Someone buys it. The new stock price is now $26/share. Now, if Person A can't sell the stock, and lowers his price, to lets say $2...
Economics
How does the International Space Station(The ISS) gets their Oxygen supply? Does it gets refilled on a regular basis? How does it gets refilled and what is the capacity of their Oxygen tank?
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Primarily via water electrolysis (running an electric current through water to break it down into Hydrogen and Oxygen), though they also get supply shipments from Earth every couple months. They also have a backup system that can generate oxygen by burning lithium perchlorate. Not quite sure what their storage capacity...
Technology
How do stock prices and currency values go up and down?
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The stock price you're referring to is actually the price of the last trade. It is a historical price – but during market hours, that's usually mere seconds ago for very liquid stocks. Whereas, the bid and ask are the best potential prices that buyers and sellers are willing to transact at: the bid for the buying side,...
Economics
How does dynamite work, and does it work differently than a hand grenade?
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The dynamite will not blast into a rock if placed next to it. The force is not pushed in any one direction. If a hole was drilled and it was placed inside. It would exert pressure against the rock in all directions. A hand grenade is made “pre seamed” and designed to fragment and create shrapnel. In all directions. The...
Physics
how do non-narcotic painkillers (acetaminophen, ibuprofen, etc.) work?
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Mostly by treating the inflammation. Basically there's a chemical your body produces (cyclooxygenase or COX) that triggers inflammation by making another chemical prostaglandin. These non-narcotic drugs (also called Non Steroidal AntiInflmmatory Drugs or NSAIDS) or COX blockers. This stops the inflammation chemical fro...
Chemistry
If humans manufacture currency, why can't we manufacture more money and hand it out to the less fortunate /lower class?
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Without something backing it, money is just paper. Economies are massive in scale, but not infinite. Each bank note is essentially a portion of a government's wealth. Printing more money, but not generating more wealth is simply dividing that wealth further among currently circulating notes, not creating more. Hyperinf...
Economics
You know how bees have to have a Queen - is the Queen bee born a queen, or when the queen dies does another bee transform into a queen? If so how does the hive decide who gets to be the queen bee?
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/u/jotenha1 is incorrect. Any larva has the potential to be a queen. It's their upbringing that turns them into queens. They're raised in their own special section of the hive and are fed a lot of royal jelly. Royal jelly contains a protein called royalactin, which changes the larva's gene expression to cause her to be...
Biology
How does surface tension work?
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Water molecules like to hang out with each other more than with air or other things that don't dissolve in it. The molecules don't bond together, but the hydrogen in one water molecule is attracted to the oxygen in another. (I'll skip the segue into electronegativity, polar bonds, and hydrogen bonding) In the center of...
Chemistry
Why are some people content living vicariously through others, while some people just get mad and jealous?
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I think you've got it wrong. People aren't "living vicariously" through others. They're either jealous (like you) or they feel happy that their friends experienced something interesting or fun. It's the fun and interesting things my friends have experienced which is why I want them as friends. If you feel mad and jealo...
Other
What happens to the weight that you loose when on a diet?
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You breathe most of it out as carbon dioxide, and pee some of it out as water. All of the energy we get from our diet is used to support cellular respiration. The input is sugar and oxygen, and the output is carbon dioxide and water. When you lose weight, you're forcing your body to raid its fat reserves, and convert t...
Biology
What would a person without colour blindness see if they wore a pair of colour blindness correction glasses?
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Enchroma lenses work by filtering out the color wavelengths that "get confused" by people with colorblindness, but don't filter out the other shades around them. A study of the Enchroma CX-14 lenses using people with normal color vision experienced what is known as a tritan defect, which has blues and violets as more g...
Biology
How does increasing the heat in the car help against fogged up windows?
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When air gets hotter, it can contain more water droplets than colder air. Conversely, water droplets in cold air look for other placed to go than the air because the cold air can't hold that much water. If there is a window nearby, they will settle on the window rather than stay in cold air. By heating the air around a...
Physics
How do turtles and other Oviparous animals breath inside their eggs?
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URL_1 URL_0 The egg shells are porous (lots of tiny holes, holes so small that we can't see them without magnification). These pores allow air (CO2 and O2) to move in and out of the egg. Close to the shell are membranes with lots of tiny blood vessels that allow these gases to diffuse across the membranes, and carry th...
Biology
A fat molecule is made of a bucket of C's, H's, and O's, whereas a water molecule is just one O and two H's. If a fat molecule is so much more massive than a water molecule, how come oil still floats on top of water?
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Water molecules can snuggle up together more tightly because they like to interact with each other. It's a special kind of molecular interaction called Hydrogen bonding, and it happens between the H on one water molecule and the O on another. Each water molecule can form four of these strong interactions, so the water ...
Chemistry
How is the lethality of a substance determined in an ethical way?
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> How is that figure determined? Apply carefully measured doses to a series of rats until half of your sample dies. Consult prior research where lethality in rats was compared to more analogous animals such as pigs. From this you determine the LD50, the lethal dose for half of a given population. Then it is just a matt...
Biology
what determines wether a flame is yellow or blue?
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The color of a flame indicates 2 things: the temperature, and the material that composes it. The blue color at the bottom of a flame, such as a candle, comes from the spectrum of the products of the reaction. The base of the flame is where the actual reaction is taking place, where the reaction products are being produ...
Chemistry
Why do some foods taste better cold and some hot? Is it strictly cultural, or are certain tastes more apt to be pleasurable at a certain temperature biologically?
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It's more physics, actually. Flavor is as much scent as it is taste. Certain foods taste better because heat allows scent molecules to move faster which mean they move into your nose quickly and you can taste them. Try this experiment: Eat something sweet, chew it up, and focus on how the taste hits your mouth. after y...
Biology
So 99% of atoms are empty space, what would it take to squeeze through them?
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At least one of the following: 1) Ten times the mass (and gravity) of the Sun. 2) Six times the temperature of the core of the Sun. 3) Be a fermion without electric charge. 4) The heat of the core of the Sun combined with at least one tenth the mass of the Sun in pure helium to allow quantum tunnelling to occur with si...
Physics
Why do objects in cartoons that move/will move appear brighter/more vibrant than objects that are stagnant in that scene?
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If you're talking about old cartoons, then that's because those objects were drawn separately. The background of a scene in a cartoon is generally a single drawing. The moving objects or characters are drawn on a separate transparent sheet, called a "cel", which is then laid on top of the background and photographed. A...
Technology
If humans all originated from one place, how did various races end up developing different physical traits?
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Partly some minor evolution, as well as bottlenecks. For the evolution part, humans need to absorb a certain amount of sunlight to be healthy. It helps us make vitamin D as well as absorb a bunch of nutrients. When you move away from the equator, the sunlight becomes weaker, therefore humans with lighter skin did bette...
Biology
Why do money market accounts generate more interest than a regular savings account?
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They do? At my bank, Ally, the interest on a savings account is 2.5 times higher than their money market account. Currently the savings rate is 1.25% and Money Market is 0.5%. Rates have dropped recently due to COVID, but money market rates have always been lower since I joined years ago.
Economics
What causes clothes to stink when they have taken long to dry?
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It's mildew. You generally have to rewash everything, including white vinegar or bleach with detergent, and use hot water to wash. Then you dry using a (laundromat) dryer until it's thoroughly dry. You could wait until the monsoon is over with, and hang it dry in the sun. You need heat/direct sunlight with air circulat...
Other
if produce has a use by date of 2 weeks time and is immediately frozen, when defrosted will it have 2 weeks from that point?
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Freezer burn is the biggest consideration after texture changes from freezing. Spinach will defrost in a state like it had already been boiled, I only find frozen spinach palatable for creamed spinach. Citrus, and some fruits like apple freeze well enough for juicing or use in fillings or sauces. Generally your assumpt...
Other
What happens neurologically when dominant hand is switched?
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So... The science isn't 100% clear on this one, but the short answer is that handedness is a habit, just like driving or typing. If suddenly your keyboard gets rearranged, you'll feel really weird using it until you eventually get used to it. Neurologically? I'm not sure what you mean. Your brain doesn't flip backwards...
Biology
Why do the instructions on pasta call for you to measure out water?
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The less water you use the sooner it will boil and the less energy you use maintaining the boil. However too little water and you end up steaming the pasta or even burn the pasta and that is not what you want. So the right amount of water is just so that the pasta starts to appear over the water just as it is done, whi...
Other
How does the Cosine Law work?
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So we can state the law of cosines in it's most common form: c² = a² + b² - 2ab•cos(C) Which it sounds like you've already found. It's important to recognise what the a, b, c and A, B, C terms are - lower case here refers to the triangle sides, and upper case is the internal angle opposite this side. As for how it work...
Mathematics
With the human population constantly growing and the need for more money, how much and who decides the amount of money made per year in a country?
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Banks do. To clear up some confusion right from the start, when you think of money being created you probably think of the government printing additional bills. This is but mostly isn't the case. In the US, the US Mint (which is federally owned) does indeed print the bills and mint the coins, but physical currency are ...
Economics
Why does refinancing a home loan involve closing fees?
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The lender still has to put in the work to process that loan. In fact, it's the same work for them as the first time you got the loan. In truth, though, you're right to be annoyed insofar as the price of the fee is in no way tied to the actual cost of processing the transaction anytime a loan is done, it's just an arbi...
Economics
Why is it so easy for a spark from a flint or other source to light a gas such as propane or butane, but the hot from a cigarette won’t do it or struggles to?
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It's because cigarettes burn at a fairly low temperature, around 400°C. More towards the middle of the glowing end, a bit less towards the edges. The spark from from a lighter flint can get up to around 3000°C Butane has an ignition temperature of 405°C. So, a cigarette could do it, but it's borderline.
Physics
How does white hat hacking work?
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It's the same as any hacking, it's just done with the express permission of the system's owner. You can hack your own computers, for example, all you want. EDIT: Typically white-hat resolves to reporting problems to the owner, helping them harden their systems against those attacks, and reporting flaws exploited to the...
Technology
Why do we always want the things we can't have? And sometimes stop wanting them the second we can have them?
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Human nature has evolved to increase our chances of survival. One result of this evolution is that many people are constantly grasping for more, more, more. Once you have something, you've accomplished that, so it's time to move on and get something more. The result is that over your lifetime, you acquire lots of stuff...
Biology
Why does the sound of poured water gets higher and higher as you keep pouring?
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Because the sound you're hearing is sound coming out of a round chamber. When the glass fills with water, the size of the chamber changes, so the pitch changes. Large chamber, low pitch. Small chamber, high pitch. It's why digieridoos are deep and rumbly while ocarinas are high pitched and whiny.
Physics
How do websites like Honey make money by finding discounts?
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They make deals with companies to get special discounts that they can offer to their users. Then they can give part of the discount to the user so they'll use the service, and keep a referral fee from the company. Its worth it for companies to work with them like that because it helps them drive traffic and make sales....
Other
How come whenever the banks have network challenges it never affects their deposit-taking activities even though other major activities such as withdrawal may not work?
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For the simple reason that you always make it possible for someone to give you money, but you don't go to extremes to make sure you can give others money. There's more to it than that on the IT side of course, but that's the long and short of it. Always be able to take in funds, don't sweat it if you can't give any out...
Other
Is there a maximum amount of pain you can feel?
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Well it can really depend on how sensitive your nerve systems are. And many times the most painful sounding things aren't really painful, because they tend to break the nerve system, like being burned alive. The first few seconds of burning are what hurt you the most, because your nerve systems are still alive. Eventua...
Biology
What's in it for people who upload torrents and pirate movies? Why do they take to risk when there's no reward?
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These days, many pirates feel they are doing a service to their "community". A lot of the groups that release pirated movies have names like "CountryReleaseTeam" that garner more reputation and support in the pirating community. It may be a feeling like getting upvotes that appeals to them, hundreds of personal message...
Other
The human body is able to heal itself when it has a cold or a broken bone. Does that also work with mental illness like a depression?
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The simple answer is, we don't know. Something like depression (or any state of consciousness) can't really be explained. It's akin to asking what consciousness is in the first place and we don't know. We do know that consciousness has something to do with the chemicals called neurotransmitters that help pass signals a...
Biology
Why is there so much focus on saving the middle class?
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There is a general historical and political theory that the presence of a strong middle class protects a society from revolution. Think about a stratified society of the obscenly wealthy next to the obscenely poor. The two groups probably fear and hate each other, and operate with a lot of myths and resentments about e...
Economics
Why do companies not purchase debt at debt collector prices and forgive it like Stephen Colbert did every year to massively reduce their tax liabilities?
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For the same reason why you can't just donate $1 million and save > = $1 million on your taxes - that's not the way the tax system works, and for good reason. The company/individual would purchase the debt at debt collector prices, and they'd be able to deduct the COST TO THEM for the debt off of their taxable income. ...
Economics
How do researchers in the humanities analyze the responses from Likert scale questionnaires?
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You can associate the individual responses with a score (strongly disagree is a 1 while strongly agree is a 5) or simply code responses as "positive or negative." Once you have a number attached in some way to responses you can then do things like hypothesis testing ("was group A's answer different, on average, than gr...
Other
what is a magnetic monopole?
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Every magnet we know and you know has two sides: north and south. Opposite sides attract, likes repel. If you break a magnet into two - every piece will now have a north and south poles. Even if you continue to break it, you won’t get a magnet that’s only south or north - which is what we mean by magnetic monopole. We ...
Physics
How does the fluid in you inner ear balance you? What happens if you go in space and there's no gravity for it?
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Picture a pond full of reedy plants: disturbing the water causes the reeds to move. It's the same with our ears: the inner ear contains thousands of tiny hair cells, and the motion of the surrounding fluid pushes them around. The brain then receives a signal that tells it 'okay, we're walking', 'we're laying down' or '...
Biology
if US is trillions in debt, who are they in debt to and what are the assets?
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Here is the information directly from the source: the US Treasury website. I've sent the link to the FAQ but the site has links that probably answers the questions. [ URL_1 ]( URL_0 ) In theory and practice, it is difficult to give a "valuation" of the assets of the government of any country. For example: how to put va...
Economics
why are some programming languages faster than others?
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In the specific instance you cited, python is a "scripting language" which means that it gets read and executed (interpreted into machine language) line-by-line each time it runs. C is a compiled language, which means it gets converted into an executable file (machine language) before you run it. So basically the line-...
Technology