Subset (10)

eli5 · 25k rows

Split (1)

train · 25k rows

query stringlengths 20 300	positive listlengths 1 1	negative listlengths 1 1
What are compression brakes?	[ "Big diesel engines can be fitted with a device which [uses the pumping action of the engine](_URL_0_) to act as a brake. It works well, but it's noisy - which is presumably why they're banned. EDIT - added link." ]	[ "This is related to a classical \"paradox\". Basically, you can't spin the record up, it will necessarily break. The (very difficult to grasp intuitively, IMO) fundamental concept at play here is that in a corotating reference frame constant time slices are non-euclidean. So trying to boost a static disk to rotat...
If the Berlin Wall was only 96 miles long, and Germany is far wider, why couldn't people just go around it to move from East to West Germany?	[ "Berlin was in the middle of East Germany. The wall went all the way around West Berlin." ]	[ "1) Cost. 2) Damage to the ecosystem of the place you get the water by taking too much. 3) Damage to the ecosystem of the receiving place by the transfer of invasive species. 4) Pipes can be the problem. Flint has dangerous water because of their plumbing. 5) You are wanting to set a permanent solution to a temp...
During WWII, how did Germany reconcile their Aryan supremacism with their alliance to Japan?	[ "Adolf Hitler spoke about how much he admired the Japanese people. He spoke of them as having pride in their race due to their limited mixing with peoples of other races. To Hitler keeping one's bloodline pure should be the goal of all races. He also spoke of them as having a long and proud history that rivaled th...	[ "We actually don’t have any primary documentation or diplomatic literature from either kingdom, as most of our information about that period in South Asia comes from numismatics and archaeology. By the time the Hellenistic-Roman wars in the Balkans were coming to a close in the first century BCE, the entire eastern...
how a bio-digester works	[ "I can't answer all of it, but I know that the bacteria involved is anaerobic - meaning it survives without oxygen. You can't have oxygen in there because it'd kill off that bacteria and it'd stop working." ]	[ "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." ]
how exactly does wireless charging work? Can it replace the cable one day entirely?	[ "Wireless charging works via electromagnetical induction. The charger has en electrical coil that you run AC power through. This created and electromagnetical field sorrounding the coil. The device (phone, pad, car) that is to be charged must have a corresponding coil (it can be physically smaller) and as this coil...	[ "General relativity is our best way to 'do' gravity, but all the other forces are done best by quantum field theory. This has caused many people to try to do gravity with quantum field theory, which introduces this idea of the graviton. This approach has, broadly speaking, failed so far. Gravitational waves are a ...
I see ads for the drug Humira on TV all the time, and it seems like every time I see a commercial for it, the drug is being advertised to treat a different disease whether it be depression, RA, plaque psoriasis, Crohn's Disease, etc.. How can one drug treat so many ailments?	[ "Humira is a drug that reduces inflammation. Because Humira treats a symptom, rather than the root cause of a disease, it's useful in treating a wide range of diseases that share that symptom. I don't think Humira is advertised as a treatment for depression, all I found online was people asking if depression was a ...	[ "I'd recommend changing your question to: Do probiotics work for xxxxxxx. We have quite a bit of literature that supplementation with a variety of species improves survival of premature infants with necrotizing enterocolitis. If you're asking, will probiotics help my chronic belly pain from my irritable bowel synd...
It is well-known that there is an increase of antibiotic resistant bacteria due to overuse in oral antibiotics. Can overuse of over the counter (OTC) topical antibiotics contribute to this problem?	[ "Yes, topical antibiotics do produce resistance and this is well beyond the skin. See _URL_0_. If you have a skin infection,by all means use them. This also applies to antimicrobial soaps, and triclosan should be avoided: _URL_1_." ]	[ "It depends. Opioids don't treat the condition in any way, they just block the pain. Ibuprofen (advil) blocks pain and reduces inflammation (swelling) which is one cause of pain. So in that sense, anti-inflammatory drugs do address the direct cause of the pain, but generally not the underlying condition. For the mo...
Why do MLMs seem to be growing while simultaneously all other purchasing trends are focused on cutting out middlemen (Amazon Prime, Costco, etc.)	[ "MLMs don't profit by selling products through the middlemen, but by selling products to the middlemen." ]	[ "Each culture has an 'in' to a particular business in each area. So, one Korean family will come and open a dry cleaning business. When their cousins come, they will tell them the tricks of the trade and the regulations and have the business model set, so their cousins open up another cleaning business one town ove...
Why hasn't Nintendo built more powerful consoles?	[ "Nintendo is trying to set themselves apart from Sony and Microsoft. Namely, they're letting those two battle it out for the market of hardcore gamers, and instead going for casual gamers. By making less powerful consoles, they can make the price lower and appeal to a broader range of customers." ]	[ "Brains easily perform many, many tasks hat are difficult for computer. Take that we know brains are optimized for pattern-finding. Consider intelligent life forms have to interact with a real 3-world and real time. Which means they can check their expectations. Testings a supposition is as simple as rotating an o...
Why do Americans use "Sir" or "Madam" when referring to people that they don't know personally?	[ "It’s respectful, what else would you call them?" ]	[ "Removing the hat being a sign of respect is a combination of several practices. A few of them are: 1) Removing dirty travel clothing such as boots/overboot coverings, cloaks, and hats as a way to not track in dirt respects the home/building you are entering. 2) Removing your hat during prayer is a Christian doctr...
If the wavelength of violet light is short, and the wavelength of red light is long, where does the wavelength of red-violet fall?	[ "It has two frequencies long and short. Two frequencies make a composite color, just like how in music, two frequencies combined produce a unique sound. Brown doesnt have its own frequency either, its just a bunch of frequencies superimposed." ]	[ "The spectrum of Bremsstrahlung cannot \"shift,\" except in its intensity. Bremsstrahlung is \"braking radiation\" and depends only on the charge of the atomic nucleus. A given electron interacting with the nuclear charge can be slowed down by any amount, producing a spectrum of radiation essentially from the acc...
Why do some nationalities have large populations of people who look physically very similar?	[ "> She can look at a person and instantly recognize if they are Russian, Polish, Ukrainian or Czech/Slovakian hahaha no chance. There are some steorytypical features (like russian women wearing fur and shit load of make up), but no way you could recognised this nations by looks." ]	[ "It is down to the combination of the genes you get half the genes from your mother and half from your father but those genes are an almost random selection of those genes which go to make up each so can be combined in trillions of different ways. Like saying you get half a pack of cards from one parent and half fr...
why do carbonated drinks make you burp?	[ "A carbonated beverage is one where the water is mixed up with carbon dioxide, which is a gas. When you swallow this water, the gas gradually leaves the water, filling your stomach. A burp is your stomach's way of getting that gas out." ]	[ "You don't want to inject air. It's difficult to fill a syringe without having at least a small air bubble. Putting the needle up and flicking will get any air bubbles in the syringe up to the end, you then push out the bubble and you know when it's all out of the needle when liquid flows through. Even when you're ...
When do we observe red shift?	[ "RobusEtCaleritas is right. You can imagine it this way: Imagine you're standing in the ocean at the beach, a short distance from the shore. Waves move toward you at a constant pace. Let's say you are hit by one swell every 10 seconds. If you start running towards the shore, you will be hit by less and less waves,...	[ "You've discovered [the twin paradox](_URL_0_). The answer is that you can't have the spaceships \"suddenly\" be at rest with each other. Either one or both must undergo acceleration. In the case of one spaceship accelerating and becoming at rest with the other, the accelerating spaceship has its time dilated. If t...
Rail gun technology for space travel...	[ "One thing I'd like to add is that railguns produce large amounts of heat, which would be difficult to dissipate in a vacuum." ]	[ "Zero-g is very bad for certain kinds of injuries. Internal bleeding is pretty much a death sentence since blood just pools in the area and clots up, and things can't drain properly. This came into play in a recent episode of the television series The Expanse. You can see the clip here: _URL_0_ The ship had just un...
Whatever happened to Joseph Kony?	[ "Kony is believed to be dead, even before the Kony 2012 stuff. I'm more interested in seeing what happened to that guy who was jerking it in San Diego" ]	[ "[Search before submitting, especially when asking about current events. The search box is in the upper righthand corner of the page.](_URL_0_)" ]
Why is parcel pickup a thing of the past?	[ "What the heck is a parcel pick up?" ]	[ "It takes a while to implement the changes. How would you like it if the law changed overnight and you had to pay fees/go to jail next day without having a chance to adapt yet." ]
Why does sucking on hard candy for too long make the inside of my cheek sore and wrinkly?	[ "The sugar in the candies is causing the a change in the relative concentration of sugars (and other things) compared to the cells in your cheek. In an attempt to re-balance the concentrations, fluid from your cheek flows into your mouth. Leaving your cheek, dry (sore) and wrinkled." ]	[ "Looking at something exercises the rod and cone cells in the back of your eyeballs which then send the signal down your optic nerves to allow your brain to process the information. If the subject is very bright, then your rod and cone cells get overworked and start to become less sensitive to whatever type of ligh...
Burlesque vs Stripping	[ "Burlesque originally developed as a racy satire show in response to economical disparities, moral squeemishness and social hang ups of Victorian England. The striptease (which differs greatly from what we would now call a striptease) was a part of the show but by no means the entirety of the show. Stripping is the...	[ "How do you tell the difference between a \"mathematical apparatus that works\" and something that is \"really real\"?" ]
What would lead a Greek/Hellenic person to make the journey to Bactria, and settle in an area like the Punjab?	[ "Did this actually happen or is the question purely hypothetical?" ]	[ "Sorry, we don't allow [throughout history questions](_URL_0_). These tend to produce threads which are collections of trivia, not the in-depth discussions about a particular topic we're looking for. If you have a specific question about a historical event or period or person, please feel free to re-compose your qu...
How do firefighters know where a forrest fire started?	[ "The fire will follow the wind. While there are fighters in the area, keeping tabs on wind direction is crucial. A lot of firefighters have died in forest fires when the wind suddenly shift direction. So you know what the prevailing winds have been, you can backtrack to find out where it started. Also the older th...	[ "How some species are related. A lot of what we know about how species are related and how close/far they are is based on genetic research, which would not be done if left only to the fossil record. The intelligence of some species might also be over looked. For example, we would have no idea that chimpanzees coul...
How does light move forever (in a hypothetical pure vacuum)? Wouldn't that take infinite energy?	[ "Newton's First Law: \"An object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force.\" Anything (light, planets, asteroids, spaceships) will move forever at a constant speed in a pure vacuum. It takes no energy at all ...	[ "[Here's a 1966 PhD thesis studying exactly that.](_URL_0_) Experimental findings have shown that at low velocity, you do get 0 drag to within experimental error, and the flow looks identical to potential flow. Weirder stuff starts happening as you accelerate the flow, and you do get drag. There are suggestions tha...
What is dark matter and dark energy?	[ "The term \"dark\" in dark matter and dark energy means that those two things are unknown. They can be inferred from their effects on the universe but have never been observed directly. Dark matter refers to the \"missing\" mass of the universe. In other words if you measure the mass of the observable universe com...	[ "The 'Deep Web' is the part of the Internet that doesn't show up on search engines and only accessible through things such as Tor. Mostly black market, drug deals, and child porn, but also has classified information that governments try to cover up (e.g. videos of soldiers bombing certain places.)" ]
If two people being able to breed is the definition of being a species and a child is always the same species as the parent, how does speciation occur?	[ "That logic isn't sound. If small changes happen in each generation, each parent is the same species as their offspring, but two random members from that lineage aren't necessarily the same species at all. That said, the entire concept of a species does abound with grey areas, and is far from rigorously defined in ...	[ "Your brain is 'trained' to know what to expect when a part of your body touches another part. In short, it's because you expect it. When someone else does it, you can't accurately anticipate the sensations. Beyond that, there isn't a lot known about this phenomena." ]
I'm a young American woman in the mid-19th century and I don't ever want to get married. What sort of life--in terms of both professional life and family life--is open to me?	[ "Are you stuck on mid-19th century? Because I can tell you about the lives and work of early women librarians, but that's more 1880s-1920s!" ]	[ "I think an important clarification here is what side of the house are you asking about, or both? The experience with a career of service and opportunity for promotion would be very different for a commissioned officer like Nelson than it was for one of his enlisted sailors. There are some overarching themes and ty...
If temperature is a measure of average kinetic energy...? (absolute zero question)	[ "The probability of a given atom having a given energy is determined by the Maxwell-Boltzmann distribution (until you get really cold and need quantum statistics). It tells us that there is a zero probability of a particle having no energy. Even at zero temperature, if a system were at it, there is still some net m...	[ "Think about how adding Sodium Chloride (table salt) lowers the freezing/melting point of water. The salt molecules interfere in the crystallization process of H2O, meaning that the temperature required for crystallization has to lowered to compensate. [Nak](_URL_0_) a Sodium Potassium alloy, has a lower melting p...
Guys who like watching their girlfriend have sex with someone else	[ "I read something before that mentioned that guys will thrust harder and ejaculate more fluid when they even think about their wife/girlfriend having sex with someone else. They hypothesized that it served an evolutionary purpose, because the male needs to remove the previous guy's semen and send in more sperm to ...	[ "You seem to be describing a variant of the [ladder paradox](_URL_0_), just using a train and tunnel instead of a ladder and a garage, he he. > What does the outside observer see? The outside observer sees the front guillotine make a cut, then later after the train has passed further through the tunnel, the back g...
Questions about the Templars	[ "Phillip felt threatened as the other holy orders, the Hospitallers and the Teutons, had got themselves land. The Teutons conquered pagan Lithuania and kept a lot of the land, while the Hospitallers took up residence in Rhodes, and later Malta. Phillip thought the templars would want to take land in France, so he k...	[ "Hi! I have approved this post but as a general tip, when asking about the accuracy of videos it's generally best to list the specific claims as specifically as possible for our commenters to address since they might not be able to view a video from where they comment. Thank you!" ]
Can long molecules split because of motion/torque?	[ "Absolutely. The molecular weight of polymers is typically reduced by industrial processes that have a lot of shear, such as injection molding. I.e the size of the molecule is reduced due to the amount of pull exerted by the equipment." ]	[ "You're right to be confused. It is 100% wrong as depicted in the movie, and a lot of people of wondered about why they made such a grave error considering the rest of the movie was somewhat realistic. It is likely that the reason this happens in the movie is that it makes things more dramatic. Artistic license i...
How can cd-key sites like _URL_1_ and _URL_0_ offer legit cd-keys much cheaper than their official retal shops?	[ "There are several ways. The main method imo, is mass buying games during promotional sales, they then sell the game with a slightly higher price than purchased remaining cheaper than the retailer. They buy games using vpns taking advantage of the Russian roubles low price where a game costing 20 quid will cost yo...	[ "Imagine a bully at school. It's the same one each day, taking the lunch money of the same handful of kids. You take note that kids seem bullied, and it's very easy to identify who the bully is, after all you only have to talk to a handful of kids to get something of note, plus everyone is pointing the same direct...
How do athletes play with broken bones and serious injuries?	[ "Adrenaline, painkillers, and a level of competetiveness the average person can't fully comprehend." ]	[ "Let's say you're in the position to make millions of dollars and help you and your family out for generations. You are also in a position to be able to avoid known offenders most of the time. Do you try to ignore that part and make millions of dollars, or do you risk throwing away your entire career? It's not an e...
(Serious) Why do men typically feel tired or exhausted after ejaculating? (maybe NSFW)	[ "I sure hope I don't have to explain this to any 5 year olds :)" ]	[ "Entropy man. It takes more energy to keep something \"clean\" or \"arranged\" than it does to let it go to chaos and become a mess. Put a bunch of strings in a box and shake it. Things will get tangled up quickly, and take more time/energy from you to untie/unknot the item(s). User /u/crnaruka answered this best i...
Why does the last actor/actress listed in the intro to old TV shows also have their role listed as well?	[ "It's just done to give prominence to that actor. A lot of that crediting stuff originated with Jonathan Harris in Lost in Space. He didn't like being listed last in the credits, so he had them credit him as a \"Special Guest Star\" in every episode of the series - it made him more prominent in the credits. Nowad...	[ "News and scheduled programs have different airing times for the different time zones. Live programs (sports, or a presidential debate or something) are scheduled so as to attempt to be convenient for everyone. This often ends up being rather late on the east coast, and inconveniently early on the west coast. I don...
Why there is more inequality in the US when we have such a progressive tax system	[ "[Here](_URL_0_), read one of the author's other blog entries. He basically goes over some the details there. In short, though, a progressive tax system isn't enough on its own to reduce income inequality because tax only 'takes' money. It has to be followed up by a progressive spending system that helps put money ...	[ "Supply and demand. I know this is a simplistic answer, and I'm not trying to be flippant, but that really is the answer." ]
Why don't I have psychic powers?	[ "The kinds of superpowers that come from having a supercomputer mind are so common that we don't think of them as superpowers. Like, say, language. Being able to carry on a conversation is hard - people have been trying for years to get computers to do it, and so far the results haven't been very good at all, but...	[ "Let's say you want to travel to Chicago from Atlanta by car. Can you predict your exact position at any given time? No. You can predict where you are going to be in the next few seconds but as you look further ahead you lose accuracy. Sure, you could say, \"I'll be near Indy around 6pm on this road, but you don't ...
What is the fuel source when oxygen tanks blow up?	[ "> What is the fuel source when oxygen tanks blow up? Any nearby fuel sources. The [Apollo I fire](_URL_1_) in January 1967 resulted, not only from a pure oxygen atmosphere in the spacecraft, but also the existence of various fuels in the craft. In the case of an environment of pure oxygen, but nothing to burn, the...	[ "Here is a paper from 1992 that gives a \"simplified\" mechanism. _URL_4_ In short, radicals are formed and then the reaction proceeds very quickly. There can be a large number of different species that take part in the reaction so it is a very complicated thing to describe kinetically. Reactions that may initiate ...
How do dryer sheets work? And why is it better to not use dryer sheets for Towels?	[ "Dryer sheets are coated in an animal-fat base that vaporizes when heated in the dryer. That animal fat makes your towels absorbent fiber's slippery and no longer absorbent." ]	[ "High coercivity vs. low coercivity. You're never going to need to re-write the information on the magnetic stripe of your credit card, so its stripe has high coercivity. That means it took a lot of energy to produce, but will take a lot of energy to erase. Hotel keys need to be re-written almost daily, so their st...
Logarithms of complex numbers? Logarithms with complex bases?	[ "Yes, all of this works, except there's one thing you haven't taken into account: when you write z = re^(ix), that representation isn't unique, you could take x' = x + 2pi, and z = re^ix' as well. Thus, when defining the logarithm^(*), you have to be careful and take this into account. You can address this by sayin...	[ "Prologic works by flipping the phase on the audio meant for the rear channel. The decoder works like this: * any audio this is present on both the left and right channel and is in phase, is routed to the center speaker. * any audio that is present on both the left and right channel but is out of phase is routed ...
During the American Revolution, what kind of soldiers were the Hessians?	[ "Calling Hessians \"mercenaries\" is a bit of misnomer, as it implies that they were simply guns for hire. They were regiments in the service of sovereign governments which were rented out wholesale by said governments to the British. It also implies that they were willing participants, when many were conscripted o...	[ "Well first you have to ask why these movements purged so many intellectuals. In every case, it's your well-educated people who pose the biggest threat to your regime. Your professionals and college professionals are typically smart, well-organized, and resourceful. They make the most capable critics against the ...
What exactly is dry cleaning?	[ "dry cleaning uses chemicals that aren't water to clean fabric that would be too delicate to be washed with soap, water, and agitation. most of the time it uses a non-flamable organic solvent called tetrachloroethylene. It's a really good solvent which is why they use it to clean clothes, unfortunately it is toxic...	[ "Before I get all high & mighty about the term \"Dark Ages,\" can you define what you mean for us?" ]
What are the effects of a tsunami on a bay as opposed to an open coastline?	[ "Waves are refracted by the shape of the underwater topography as they approach a beach. Waves impinging on shallow water slow down. The effect is to concentrate wave energy on headlands and peninsulas and reduce the energy in bays and coves. This [web page](_URL_1_) has some nice figures: [Energy convergence on he...	[ "No. Tornados don't really care much about the topography of the landscape. My town is at the intersection of two rivers and was hit by a large tornado back in the 50's that devastated the [city](_URL_0_). I grew up in Kansas City, which is at the intersection of the Missouri and Kansas rivers and recall as a kid t...
How do electronics spin in full circles without getting their wires tangled? (Example in text)	[ "The rotating portion receives electricity through a device like a \"rotary electrical connector\" or a \"brush slip ring\". They allow current to pass through two concentric rings, one inside the other, separated by an insulator, and depending on how fast it's intended to rotate, possibly sealed and lubricated." ]	[ "Let's imagine that you have a small water mill and a glass. If you use the glass directly on the water mill, the water mill will not turn regularly because you need to refill your glass with water. Now, let's use a funnel between your glass and your mill. You are now able to run your mill. (Most of sand mill toys...
If "Beam me up, Scotty" was never used in Star Trek, who actually coin that term?	[ "It's actually impossible to say. Basically, there were several lines through the show that were very similar, from \"Beam us up, Scotty\" to \"Scotty, beam me up\", and in the collective consciousness of viewers and fans, they all sort of merged together and out of that emerged \"Beam me up, Scotty\". There's seld...	[ "Usually it's referring to how government contracts are awarded. Contractors submit bids for how much it will cost to do a particular job for the government, and the government is required to choose the contractor with the lowest cost estimate. So like Apollo astronaut Alan Shepherd said: \"It's a very sobering fee...
Where did middle class 18th or 19th century people keep their horses?	[ "Livery yards, where in pretty much every-town and sort of a necessity, kind of like payed parking lots in major cities, people would pay a weekly/monthly fee to keep their horse there, there were different kinds of Livery yards as well which offered varied services, some would feed, exercise your horse for you, ot...	[ "hi! Could you clarify the scope of this question? Are you mainly asking about practices in Scotland / the British Isles roughly around the Civil Wars, or landowners anytime anywhere? [hint: [say the former](_URL_0_) ]" ]
What happens that causes us to blackout from drinking too much?	[ "> Alcohol primarily interferes with the ability to form new long–term memories, leaving intact previously established long–term memories and the ability to keep new information active in memory for brief periods. As the amount of alcohol consumed increases, so does the magnitude of the memory impairments. Large am...	[ "There are a few factors at work here : Moſt chairs are deſigned to ſit at about knee height ; they generally ſupport your back, and more importantly, your butt and legs. Toilets are uſually lower, and they are made with a large hole in the middle, into which you ſink a little. This lower height, lack of ſupport,...
How much energy does it take to boot up an electronic device in comparison to the energy required to run it on stand by?	[ "It really depends on what type of components are in the computer and what sort of power state they are in during the break (eg. standby mode, or just running with a screen saver). But in general the components in computers don't work like that. They use relatively constant amounts of power. Using a theoretical com...	[ "yes, it's not the number of calories per se but giving the body longer in a state of reduced metabolic processing ie rest. The modern accessibility of food means people are eating more than we have evolved (without exercise to earn it) thus have a constant need to create insulin and fat cells - > obesity & diabete...
If a childs parent or parents are drug addicts or alcoholics does this effect the child in any biologically?	[ "Yes, during pregnancy. Alcohol and other drugs can cross over the placenta into the fetal blood supply and have various consequences to the fetus. Look up fetal alcohol syndrome. Also, sadly, with opioid addiction being so common today many babies are born addicts and have to be tapered down on morphine in the hos...	[ "It's very difficult to get someone jailed for not paying what they owe. You have to prove that they could pay but choose not to; even when that's possible, we're generally uncomfortable with the idea of jailing people for not paying debts. The other solution is taking their money. But we don't think it's okay fo...
Those random muscle twitches you get in your arms and legs	[ "Fasciculations. Fasciculations are caused by something irritating the nerve fibers and can just kinda happen. There isn't one specific cause for this, but the majority are benign and pretty much no one has any interest in studying the majority of causes. Some Fasciculations can be the result of a health issue (in...	[ "You mean like the ones you only notice when you're watching someone sleep really closely for hours on end? Don't know." ]
Mutations in Evolution.	[ "When you are creating new offspring, the genes come from the parents. The copying process however is not perfect and there is also some mixing of genes going on. As a result, the offspring will sometimes have differences compared to its parents. We call these changes 'mutations'. If the change is useful, there is ...	[ "Variation in any population makes it more resistant to disease or predators. Imagine if there was a new disease that would kill anyone with type A blood in seven hours. It'd be a VERY good thing that we have portions of the population with types B, AB, and O." ]
Why can British actors often easily speak with an American accent in movies, but the British accent is hard to imitate for Americans?	[ "Both are about equally as difficult. Actors who can pull off a flawless foreign accent learn it by taking lessons with a dialog coach. Eventually, they come to understand how the accent \"works,\" and can speak freely in it. If they spend TOO much time speaking it, it can actually change their native accent. Gary ...	[ "You didn't take into account total cost of living In the UK your healthcare is free or cheap (NHS), in the US it's freaking expensive. That teacher probably has student loans to pay off too, in the UK the cost of education used to be much cheaper so it doesn't factor much into the effect on median wage. With the r...
If the moon can eclipse the sun why can we see stars every night?	[ "The moon can block out the sun because it's massively closer than any planets. Sometimes that one really bright star you might see in the night sky is actually Venus. It's just a tiny point of light and it's the closest planet to the earth. Other planets in our own solar system will be even less visible than that....	[ "The rays (called [crepuscular rays](_URL_0_)) are parallel. Their appearance of not being parallel is simply a trick of perspective. It's the same concept as how parallel train tracks will look like they converge in the distance if you're standing between them. Edit: [This image from the ISS](_URL_1_) show...
Given the theory of quantum entanglement and the statement you can't use it to send information. Why not set up two devices with entangled particles and use it to send binary ?	[ "You can't communicate useful information with entanglement. An observation on one end only gives you your 1 or 0, but you can't choose whether it's 1 or 0. This means that if you observe ten states, the person at the other end will only observe ten randomly generated binary digits since you have no way of decidin...	[ "As complex as sound.. uh.. sounds, really your ear drum is interpreting all those various sounds into one wave form. That is because you have one ear drum in each year, and it has only so many dimensions. It's really a matter of how much pressure, and how fast, the ear drum is vibrating. When we first started s...
What stops a bank from adding money to an account without decreasing it from another?	[ "Auditing. The second they got caught (and they would eventually be caught) they would cease to be a bank because nobody would trust them anymore." ]	[ "There's a famous article on this that you might want to read: [\"What every computer scientist should know about floating point arithmetic.\"](_URL_0_) Long story short, addition and subtraction are equally as computationally complex, multiplication is a little more complex than that, and division is more complex ...
How did humans end up on islands in the middle of Pacific? How did they know there was land hundreds if not thousands of miles away?	[ "If you see birds flying from a particular direction from the sea, there is an excellent chance that there's some land in that direction. It didn't take the Polynesians long to figure that one out." ]	[ "Most people copy ideas. If the tribe A comes up with a good idea, then tribe B next door will copy it. Or tribe A's good idea may make it powerful enough to conquer tribe B and force them to adopt their idea. Isolated communities may not be exposed to outsiders' ideas (like modern technology) so they don't copy th...
How on earth do TV stations subtitle a live-to-air show?	[ "A stenographer does it. Just like in a court room or a deposition, a stenographer uses a stenograph to take shorthand. Every keystroke is either a word, a phrase, or a phonetic sound, so an experienced stenographer can keep up with whoever is talking." ]	[ "Most have a [relay phone](_URL_0_) in their homes - they use an interpreter. [TTY](_URL_1_) is also available on mobile phones, landlines, and in 911 centers." ]
why do people with accents lose their accents when singing?	[ "Because when they sing, they are consciously controlling their voice and producing a particular phonetic effect. Like you would if you're imitating birdsong. They are in very good control of their voice, and can produce specific desired sounds rather than speaking/singing in their natural accent." ]	[ "There are a lot of factors, one of them that when artists play these overseas venues, they're often playing for multiple nights. That way they can record multiple shows with a consistent audio quality and crowd noise and use the best performances. Another factor is that many of these venues are specially suited to...
How do anti-bacterial hand gels/soaps kill bacterial cells but not your own cells?	[ "Bacteria doesn't have a protective layer of dermis and epidermis covering it. If you were to inject pure alcohol hand sanitizer into your body, I have confidence it would kill the cells it came into contact with." ]	[ "Your brain is what tells you something hurts. Your body has millions of little feelers (nerve endings) all over that talk to the brain, and can tell it if something hurts. When something does hurt, the feelers will tell the brain where the hurt is coming from. What painkillers do is stop the feelers from being abl...
How a company can trademark a single word and prevent the word being used in anything?	[ "Trademarks are not that broad. They can only prevent a word from being used in a similar product line close enough to the original to cause confusion. So the \"Sky TV\" trademark going against \"No Man's Sky\" videogame is not actually close enough to cause confusion so they will not win a case trying to go after ...	[ "Am i the only one who thinks that this and the other examples below are a good thing? Hear me out, maybe the best way to take the power away from these horrible horrible people and ideas (and the people who still believe them) is to disassociate their symbolism from said movements. Imagine if in a hundred years th...
Why is not recommended to switch back from synthetic or semisynthetic motor oil to regular mineral oil or viceversa?	[ "Because it's a myth. Your engine doesn't care. However, on old engines starting on synthetic might, just might, cause a leak. Moreover, it doesn't make sense to switch: why did you pay extra all those times and now you're too cheap? Just pick one and don't worry. Most people get rid of their cars long before it ne...	[ "You know when iTunes, Facebook or your phone updates and how you know it's the same program as before but things have changed slightly and you are kind of lost. Well that's what it would be like going from animals to humans with the errors being death instead of frustration." ]
Could the Earth move fast enough to lose its atmosphere?	[ "There are two issues with your question: * The Earth's gravity holds the atmosphere. Its magnetic field plays no direct role. * Velocity is relative, so unless the Earth is moving through a medium (of which there is none in space), motion has no effect. It's not like driving a fast car and feeling the wind in your...	[ "Sure if you can run at 3700 miles per second." ]
How / why did America lose the Vietnam War?	[ "The primary reason America lost the Vietnam war was because it was unpopular, both at home and in South Vietnam itself." ]	[ "Which soldiers? When? In Desert Storm or Waterloo?" ]
Was king Offa Rex a Muslim ?	[ "\"Rex\" is Latin for \"king\". May I ask about the reason for the question, as one would not normally suspect an 8th century English king of being a follower of the Prophet? Is it because of the coin found that is a copy of an Arab dinar, with Offa Rex on one side and Arabic text on the other?" ]	[ "Yes! For example, [Charles James Fox](_URL_0_), who eventually became the Foreign Affairs secretary, publicly held some pretty radical sympathetic opinions during the Revolution." ]
if a substance has no hydrogen in it, does it have a pH?	[ "PH only works for solutions in water and its measuring not Hydrogen, but the concentration of Hydrogen ions in the solution. If you take a litmus test to a dry block of iron (which contains no hydrogen and isn't solved in water) nothing happens, if you throw the iron into the water and test the water, the litmus t...	[ "In the Ancient Greek language (not sure about Modern Greek) vowels were either aspirated or not. Essentially that means that whether or not there was a \"rough breathing sound\" or an H sound before a word. Modern typography uses marks that look similar to commas. For instance the word hoplites should be written i...
It is said that our bodies are 70% water, but what does this really mean?	[ "It means 70% of your mass is water, but i'll grant you that it's often difficult to visualise where this water is as we seem to be rather solid! A lot of the bodies water is contained inside cells: Each cell is like a little bag full of water (containing dissolved mineral ions and organic molecules) called cytoso...	[ "Could somebody explain how, if true, small amounts of alcohol is good for you?" ]
How do women know when its time to change a tampon?	[ "It'd be so cool if women could just tell when it's time to have their period and just squirt out all the blood at once in one big gush, just like taking a satanic blood poop." ]	[ "It's not. It was a few years ago, but because battery tech has improved, it's no longer a concern. Older batteries had various problems (known collectively as battery memory) where they would act like they were charged when they weren't or would act like they were empty when they weren't. That problem was ...
Does the expansion of the universe converge to a certain number?	[ "Neat question. The size of the \"whole universe\" is already infinite, so it isn't a meaningful question about whether or not this size will converge. However, the size of the \"observable universe\"^1 is finite, so it is meaningful to ask about whether or not this size will converge as time - > infinity. In other...	[ "not disproven per se, but yeah, it seems to strongly indicate that Big Crunch won't happen." ]
How do scientists calculate the necessary fuel to shoot a rocket (with astronauts) into space?	[ "They just use the [Tsiolkovsky rocket equation](_URL_0_) to calculate the delta-v you have compared to what you need, and then add a little extra because nobody's perfect. This requires a few things are known, delta-v needed (pretty well known, easy to calculate in space, harder at launch time), the engine ISP (ea...	[ "A few different ways; - [Lasers](_URL_0_) for really close things like the moon. - [Parallax](_URL_2_) used for nearby planets and stars. - [Standard candles](_URL_1_), the brightness of a specific type of supernova which gives a good range. - [Red Shift](_URL_3_) for things very far away. For more detail on how a...
What Causes Physical Differences (Primarily their facial appearance) in individuals with severe autism?	[ "In addition to what people have said here, there are also many individuals who have autism due to a specific genetic syndrome (a mutation in a single gene, chromosome deletion or duplication, etc). Genetic syndromes, particularly those caused by chromosome abnormalities, will often cause facial differences." ]	[ "I am not an expert on architecture but I think it has something to do with the time at which most of these buildings were made. Also keep in mind that even in cities with artistic buildings many will still be very basic looking because it is spatially and economically efficient." ]
How do police officers (U.S.) avoid charges of second degree murder or involuntary manslaughter when they shoot an unarmed civilian?	[ "Graham vs. Connor states that an officer's actions must be looked at through the information the officer has at the time and what a reasonable person would do in that circumstance. Basically, a shooting doesn't automatically become unjustified just because it turned out the suspect didn't have a weapon. For one Al...	[ "The supreme court had previously held that making private copies available for use by others was legal in Canada (see BMG vs. John Doe). As such, there was no legal copyright infringement that copyright holders could use as leverage to get (the subpoenas required to get) ISPs to disclose the identities of the file...
What happens to dead neurons?	[ "Our body contains phagocytes, cells that break down dead cells, sometimes into reusable parts. They also play a role in keeping out diseases and foreign particles. The brain carries an array of macrophages that execute phagocyte behavior, and will get rid of the dead cells if need be. Sources: _URL_1_ _URL_0_ _URL...	[ "it's sold to bonemeal producers that grind them up and sell it as bonemeal, used for gardening as a fertilizer." ]
What's the difference between Lithium Ion and NiCad batteries?	[ "Succinctly, no, there is no advantage of NiCd batteries over Li-ion batteries. Lithium batteries consistently outperform their older counterparts for almost all conditions. To begin with, the energy density of Li-ion is much greater, 250-676Wh/L (Watt-hours per litre) versus NiCd's 50-150Wh/L. Li-ion's charge effi...	[ "Liquids go bad much (_much_) faster than pills because the liquid (usually water) provides an active breeding ground for germs. Most of the long-shelf-life liquid medicines out there have a natural preservative in them: alcohol (next time you're in the drug store aisle, look at the ingredients on that bottle of ny...
Why does the lever arm multiply force?	[ "It doesn't multiply force, it increases torque. Torque is (r x F), so a larger r gives a larger torque. For rotational systems, you balance torques, not forces, so you get an analogous equation to Newton's sum F = ma but for torques." ]	[ "Classical mechanics is what you probably already know: newton's laws, and 'energy is neither created nor destroyed'. Lagrangian and Hamiltonian mechanics are both different ways of stating the same laws. No new laws discovered, nor do they apply to different things. But they do massively simplify certain calcula...
Can L'Hôpital's Rule be applied again if lim x- > c f'(c)/g'(c) fits the original criteria? And what's the inuition behind the rule to begin with?	[ "Yes you can apply the rule again! The rule only cares about whether or not the function fits the criteria, not where the function came from! And in your problem sets, you'll probably see limits that you can only solve by applying it twice. As for the intuition behind it? Hmmmm.... Basically, if you have an interme...	[ "Because (1+ epsilon)^inf = inf for any epsilon > 0. Take the log of this value: log(1^inf ) = inf * log(1) = inf * 0. And thus we have converted it into a more traditional indeterminate form." ]
What is the .1% of bacteria that Lysol doesn't kill?	[ "They do that so if it doesn't kill all the germs they can't be sued for false advertising." ]	[ "Toothpaste contains a detergent called sodium lauryl sulfphate. It both cleans your teeth and suppresses your ability to taste sweetness so you only taste the sour and bitter flavours." ]
Why is the top hat, curly moustache and monocle considered to be evil/villainous?	[ "Well here in the UK we have Guy Fawkes. Every year we have 'Guy Fawkes night' where we set of fireworks and burn effigies of this famous hatted/curly bearded man. He was the basis for the V for vendetta movie, although for whatever reason they made him the good guy. Otherwise it was actually taken from 'evil gree...	[ "When they first formed in the 1800s and early 1900s they were elite social clubs for professional networking within a college (not party club). They wanted to show off that elite educational status of things by having names and mottos based in Latin and Greek. Two languages associated for centuries with the highly...
Why does pouring warm soda into a glass of ice flatten it?	[ "I'm going to add to the previous reply, as a black-belt home brewer. A lot of things (sugar, salt) dissolve better when the liquid is hotter. This is the basis of making syrup or candy. But carbon dioxide (the fizz in soda and beer) can get dissolved in water at a pretty cool temperature, sort of its ideal maximum...	[ "This is called the [Cheerios Effect](_URL_1_). I find this amusing. Basically, when something is floating in a liquid, a [meniscus](_URL_0_) forms around it. (In the case of the bubbles, it's a concave meniscus.) Since the bubbles float, they want to be at the highest point achievable on the surface of the liquid,...
Do these algae-powered street lamps really work?	[ "This is such a poorly written article: this means that the lamps represent a viable electricity-free lighting solution even for locations where there is no or little natural light This is a PR fluff piece about a vaporware company." ]	[ "Quoting [Wikipedia](_URL_0_) (a bit naughty, but it's a nice way to express what I think): > The proposed theory is inconsistent with quantum mechanics and critics have ruled it out on those grounds. Which is essentially saying what you pointed out, yes. If what they're doing is as easy as it sounds - just runnin...
Are muscles an obstacle in surgery?	[ "Not really. At least, it's much easier to deal with compared to excessive fat. With even very muscular people, the muscle can be pulled back and clamped once it's out of the way. With excessively fat people, it usually requires a surgical intern to hold the fat back through the procedure because it's too thick/wea...	[ "Found a thread on another forum [here](_URL_0_), answering this exact question. There is height difference on the terrain to overcome, the oceans actually have different tides that have an impact, trade winds cause a buildup of water on one side, and some more minor impacts as height of the geoid on either side of...
To what extent did military aristocracies in general actually enjoy combat?	[ "Medieval European knights and other warrior classes loved battle. They relished in it, and hated when they weren't fighting. Battle was what defined their class and allowed them to advance socially. On the knight, excerpts from \"A Distant Mirror: The Calamitous 14th Century\" by Barbara W. Tuchman. \"Battle was h...	[ "If it's okay, I'd like to ask an add-on question: could anyone, theoretically, do the exam, or was it restricted to the middle classes? I mean, clearly a peasant would probably fail because of their poor education, but were they allowed to try?" ]
What stopped the viking colonization of america?	[ "Early colonisation attempts was driven back by local natives. Thoralv Erikson was killed by native arrows in his expedition and when Thorfinn Karlsefni tried to colonize Vinland with three ships and 140 men he also met resistance. After several skirmishes where the technological superior vikings won and \"slew man...	[ "Unfortunately, AskHistorians only deals with what did happen, not what might have happened and I've therefore had to remove your post. However, your question would be perfect for /r/HistoricalWhatIf, should you wish to cross-post. Thank you." ]
Why is it not the Police's job to protect people?	[ "They're known as law enforcement, not protectors of the people. The Supreme Court determined that police do not have a constitutional duty to protect you. They, as an extension of the executive branch, are tasked with enforcing laws and are obligated to do no more." ]	[ "I don't think this is a very good topic for ELI5, but here's my quick attempt: A lot of things happened on 9/11 that have never happened in the history of America. Because of this, many people don't understand some of the more specific moments of that day. Everyone knows what the big picture is, but the argument i...
Why when touching hot water is there two 'pulses' of heat?	[ "The initial pain is from temperature receptors on your skin. This initial contact does not do very much damage. It is the thermal injury under the dermis (skin) that really causes the most damage. Heat from the intial injury will keep spreading through tissue unbeknownst to the human eye and cause additional pain....	[ "The hum you hear is 50Hz (or 60Hz, depends on the country) which comes from electric power grid. Your body acts like an antenna and it is caching signal from power wires which are usually close to you. The changing pressure is changing the contact resistance." ]
If you threw a toaster into an ocean, how come of the surrounding water would become electrified?	[ "Yes, it's dissipation. Although salt water is more conductive to electricity, you're literally dipping a toaster into an ocean in which case the current from the toaster won't be able to spread throughout. Locally, you could get shocked - meaning you can touch the toaster underwater or be very close, but if you dr...	[ "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 can humans not maintain a sprint speed for longer distances e.g. 5k, 10k	[ "Human skeletal muscle contains enough stored energy in the form of various chemicals to operate anaerobically - that is, without air (and more importantly oxygen) - for something like 10 to 30 seconds depending on the person (and I'm sure shorter or longer than that for some people). Once that reserve energy is u...	[ "Think of it like a balloon you are trying to blow up. You can start huffing and puffing with great abandon as the balloon isn't going to pop. but when it gets to certain size you start to worry, You want the balloon bigger but you worry it might go bang. So you have to slow your puffing down." ]
Could it be theoretically possible to use an atom to store more than one bit of information by reading and rewriting the electron orbital configuations?	[ "No. The electrons will always fall back to the lowest energy state." ]	[ "Recently NAND manufacturers have been stacking dies to create larger chips. Sandisk have managed to [stack twenty five 8GB dies](_URL_0_) into this chip for a total of 200GB. In the past memory became larger due to the size of the transistors. This is slowing down and stacking dies is starting to take over, partl...
Why do humans need to learn how to swim while many other mammals seem to instinctively know how?	[ "Humans also instinctively know how to swim. It's just that we're too smart to realize it and start fumbling and panicking like crazy in water, instead of letting basic instincts kick in. Nobody ever taught me how to tread water and stay afloat for example, but I sure know how to do it!" ]	[ "When light moves from one medium to another, it refracts (distorts). The eye evolved underwater, so it evolved to have fluid inside it so light would move from the water into the eye without refraction. Your eyes have adapted to compensate for the refraction that happens when light goes from the air to the fluid i...
What exactly happens when someone is accidentally infused with the wrong blood type?	[ "Blood types are basically just a shorthand for \"this person's blood has these flags on it.\" When your body sees blood with the same flag as all the other blood (or no flags at all), it just assumes it belongs there and everything moves along happily. When blood with the wrong type is introduced, your body sees a...	[ "Some folks sue and win large sums of money. Some folks get an apology. Some folks get a bill for room and board. It can depend on your jurisdiction, the good/bad faith conduct of the people who established your guilt, and the potency of your legal representation." ]
Goebbels is often considered to have been a master propaganda, but what is his legacy? Did Goebbels influence the development of modern media or culture in any way?	[ "Follow up question. Is Goebbels largely responsible for the prevalence of the \"Clean Wehrmacht Myth\" present in modern day society or was that born out of something else entirely?" ]	[ "Gisela Perl wrote a book on her time as a doctor in Auschwitz in which she admits to performing hundreds, if not thousands, of abortions. Her story seems to imply that pregnancy was not unusual and that many in the camps knew that they would be at risk by continuing the pregnancy. Starvation rations would make the...
Did not know that there had been so many Nuclear tests. Could they be partly responsble for climate change?	[ "Most of those were below ground, and the above ground tests would have produced a slight cooling effect due to kicking up particulates." ]	[ "It depends on how close the explosion was to ground level, and how big it was, how much protective gear you are wearing, and how long you would be staying (are you coming out of hiding just to leave the area, or are you planning to live there?) TLDR: Bigger warheads, and detonations that are closer to the ground ...
Why do children call their parents mom or dad, instead of their names?	[ "When kids start to talk they can only make simple consonant-vowel combinations. \"Ba Bo Me Pa Ma\". But one of the first words they need to know is the word for their mom and dad. They can't say \"Rachel\" or \"Manoj\" or \"Frederick\" but they can say \"mama\" or \"papa\" so that's what sticks. Also, some cultur...	[ "It's completely cultural. Some languages are tonal, which means that a word's tone is an inherent part of its pronunciation. If you change the tone from a falling one to a rising tone, you've mispronounced it and have likely said a different word entirely. In Mandarin questions are indicated by adding the word \"m...
Why do dogs wag their tails when they're happy?	[ "Dogs tail wagging can actually mean a lot more than just happy. It's a form of communication if dogs smiled like humans they would actually be taken as aggressive or submissive depending on additional body language." ]	[ "Put a slinky in a long glass tube and fix one end of the slinky to one end of the tube. Now lay the tube on your desk. The slinky is all curled up . Next, stand the tube upright. One end of the slinky is fixed to the top of the tube and the bottom of the slinky dangles down. What if you held the tube at an angle.....
Could you genetically engineer plants to produce any drug?	[ "Some things are already made in bacteria/yeast. However you need to consider some things: * starting materials: can the plant/bacteria/fungi import the starting materials efficiently? are they nontoxic to the host? * is the final product toxic to the host? are the intermediates toxic? * are the intermediates going...	[ "Nasa, among other groups with space exploration in mind, are asking that question themselves: _URL_0_ It seems the biggest problem to overcome is the low atmospheric pressure, which sucks the already rare water out of plants. Nutrients don't seem to be a problem." ]
Since it has been proven that the water of Flint Michigan is toxic, why hasn't someone gotten a lawyer and filed a class action lawsuit?	[ "I'm not a lawyer, but I wouldn't invest the time and effort into it if the case didn't have a fair chance to succeed. I imagine it would be difficult to prove who exactly is to blame and why given that this is such a massive problem." ]	[ "There isn't a global world police. It's easy for a single country to say \"hey, factories, cut that out\" if they collude, but no one really has the power to go a bunch of unrelated countries and then force laws onto them. I mean the US already goes pretty far into openly starting wars to influence the way oil is...
How does counting cards work in blackjack?	[ "You assign point values to each card. * 2, 3, 4, 5, 6 ➤ +1 * Cards 7, 8, 9 ➤ 0 * Cards 10, Jack, Queen, King, Ace ➤ -1 After each card is played, add the points of the count to the running total. The lower the count is, the more likely it is that you'll receive a lower card. The higher the count is, the more likel...	[ "Go to a new area of Australia (or wherever). Comb one acre very carefully, cataloging every species. Figure out how many new species there are. Do this in a few different places, figure out about how many new species there are in general, and extrapolate." ]
I'm a peasant living in the dark ages. Winter is coming; what would I do to prepare?	[ "By dark ages, when do you mean? A lot changed in the life of peasants between 500 and 1500 CE: significant technological innovations in farming, food production and preservation; the developing sophistication and breadth of merchant trading further changed the nature of available goods through the latter middle ...	[ "Read. Read this subreddit. Read this subreddit's [Popular Questions](_URL_1_). Read some of [this subreddit's recommended books about history](_URL_2_). Read some of [this subreddit's recommended academic resources](_URL_0_). Read. That should keep you occupied for a year or five. And, it'll get you started!" ]
If you get metal plates or if you have prosthetics, are you unable to enter into MRI's due to magnets?	[ "Just as an add in I've had 4 hip replacements and have had MRI's since. They're titanium so magnets aren't attracted to them but it does distort the image on the MRI." ]	[ "Sure, The plan you describe would work wonderfully, but there are some things to keep in mind. First, the actual amount of heat generated would either be very little, but last a long time, or the opposite, with a great amount of heat being produced, but it will wane quickly. The radiation would not cause any probl...
What would happen to a white person during segregation who intentionally used "colored" facilities as a form of protest?	[ "Likely nothing. White people didn't face legal repercussions for using \"colored\" fountains. There would have been a chance of social derision from the White community, due to the association with African Americans, or the significantly lower quality of \"Colored\" specific areas but nothing illegal would have ha...	[ "You actually still can. It's called [check kiting](_URL_2_) and it's super illegal, you will get caught, blah blah, disclaimer. Get three separate checking accounts. Write a check from account 1 to account 2 for whatever you would like. Go to bank 2 and cash it. Now you can either run like the full force of the FB...
What is the current status on research around the millennium prize problems? Which problem is most likely to be solved next?	[ "Dr. Terrence Tao, a renowned mathematician, is working on the Navier-Stokes existence and smoothness problem. In 2014, he had a big result for a certain form of the equation. I was still in college at the time and my PDE professor said that most of the mathematics community expects him to be the one to win the pri...	[ "uh, Mozart? Most of the top chess players? (Go players too apparently). [Most of them live pretty good lives as professionals. ](_URL_0_) You know, other than Ted Kaczynski... But a lot of this is just perception. Who would you say are the top 5 mathematical genius's today? Can you name even one? Society doesn...
Why hasn't evolution expanded the color spectrum of canines' vision?	[ "Evolution is completely random. Asking \"why\" a particular trait has not been developed is a futile exercise because evolution has no direction. Organisms evolve over time in response to environmenta l pressures. So long as the organism continues reproduce successfully it doesn't really matter how many colors the...	[ "We can, it is just it takes a lot of study and the language isn't in the same form as human language so it isn't just like learning German or Spanish and it comes with body language, scents and other non verbal cues _URL_0_" ]
What is the net charge of the universe?	[ "There are several indications that the universe is in fact charge-neutral. For starters, gravity seems to be the dominant force when dealing with cosmological length scales. Since the electromagnetic force is much much stronger than the gravitational force, if the universe had a net charge we'd probably see eviden...	[ "Just use e=mc^2 and bear in mind that about half the energy released will be in neutrinos that don't really interact with anything, and voila." ]

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