Subset (10)

eli5 · 25k rows

Split (1)

train · 25k rows

query stringlengths 20 300	positive listlengths 1 1	negative listlengths 1 1
Would a car with six wheels, four at the front all turning, two at the back not turning work?	[ "Check out the [Tyrrell P34](_URL_0_) formula 1 car." ]	[ "A good illustration of the 3 body problem is how the moon rotates around the earth, and the earth rotates around the sun, where the moon is gravitationally impacted by both bodies. Another example might be two stars that rotate around each other, with a planet in the solar system. Some solutions are fairly stable,...
High-Frequency Trading	[ "Large banks on Wall Street and other trading institutions such as hedge funds create complex algorithms which are then used to write computer software. These computers make trades based on any number of factors spelled out in the code, usually very small and very fast changes and patterns in the market price of a ...	[ "I would suggest you look back at a few concepts: * Arbitrage * The 2-of-3 concept of fiscal policy I don't know if I can ELY5 though." ]
Monday \| Games and History	[ "I was never very good at history and never studied it very deeply, but i recently was given Civilization V. Now civ is very innacurate when it comes to events (you get Babylon launching a spaceship in 1860), but actual people, place names, and units (french foreign legion, immortals, etc) are real. It had me looki...	[ "I think this is a better question for /r/asklinguistics. The concept of the subreddit is the same except it's for linguistics! Historians usually don't involve themselves with language." ]
How is a new chinese language character created?	[ "NO new character is created, but new words using already-existing characters. There are basically 3 methods of doing that : 1) using the MEANING of the characters. Like \"computer\" is spelled \"electric brain\" (电脑) 2) using the SOUND of the characters, to get something resembling the original pronunciation, like...	[ "Not to discourage further discussion, but you may want to try asking this question in /r/asklinguistics as well." ]
Wormholes: What causes them and how do they work?	[ "They haven't been observed in the real world. So, they are essentially theoretical constructs that mostly keep science journalists employed speculating about them (along with a handful of theoretical physicist), and useful plot devices for sci-fi stories." ]	[ "VSauce on Youtube made a very good video on this, I highly recommend you check it out: _URL_0_" ]
How do they measure the distance every player covers in a football match?	[ "Not sure if it has changed. But it used to be that the field was divided into regions which each has a camera dedicated to it. The cameras feeds a computer that calculates the trajection of the ball and player and from that you get how far they have moved." ]	[ "Same reason surgeons don't get arrested for stabbing people. By playing a contact sport, you are implicitly consenting to a level of physical violence." ]
The difference between England, Great Britain, and the United Kingdom.	[ "Best explanation: _URL_0_ TL;DW: United Kingdom contains Great Britain (and others), which contains England (and others)." ]	[ "This CGP Grey video does a really good job of explaining it all. _URL_3_" ]
The differences between acetaminophen, ibuprofen, & aspirin?	[ "What's common is that they all affect the way your body creates and processes pain, but that's about it. Why three separate ones exist is because they all have different chemical structures, and are handled when you take them by separate \"metabolic pathways\" (the process in which they are absorbed into, affect, ...	[ "Taliban - Tribal alliance from Afghanistan. They want control of Afghanistan/Pakistan, as that is the territory they are present in. ISIS/ISIL - Product of the Syrian Civil war, their organization is attempting to create a unified Islamic state throughout the Region they are present in. Al Qaeda - International or...
Why do we have treatments like Frontline for dogs and cats, protecting them from ticks for a full month, but humans need to apply bug spray for each possible exposure?	[ "Acceptable risk. It is acceptable to put a mild poison in a pet's body, because the poison is protecting them from what could presumably be a worse sickness. Pet's are also shorter lived, so the poison has less chance to cause harm. And most humans have the sense to not go in places where ticks are, or at least ta...	[ "Several insects navigate using the position of the sun (and moon) as a reference point. Sun is relatively stable on the sky, only moving as the earth revolves during the day, so when you move 100 meters in one direction, the sun is still in the same place relative to you. But if you have a lamp and move 100 meters...
Why is so much considered cancerous or harmful in California compared to other states?	[ "Not LY5, but [here](_URL_0_) is what it's about. The products are likely totally safe in reasonable quantities, and this law results in those signs being displayed all over the fucking place, negating the whole purpose." ]	[ "Laws usually don't have to make sense. It is what the politicians and the lobbyists can make the people think are concerns." ]
Why do humans need braces for their teeth, when other animals teeth seem to fit perfectly in their mouths? Shouldn't evolution fixed this already?	[ "Humans don't need braces. In almost all cases it's purely cosmetic. There are some extreme conditions where braces can alleviate conditions that would actually be debilitating. Such conditions also occur in the animal kingdom, in those cases, the animals generally die." ]	[ "The same reason your clothes could fit vaccuum sealed into a few small moving boxes, but typically we have them hung loose in the closet. They are easier to manipulate, use, and put back away, and you find paying for more closet space a fair trade off to the time and energy of vacuum packing and unpacking your clo...
In neuron depolarization, why does the cell use two types of ions (Na+ and K+) if they are both positive? Why not just use one type?	[ "Na is being pumped out of the cell and K is being pumped in. There is a high concentration of Na outside the cell and a high concentration of K inside the cell. However for every 3Na coming out of the cell 2K are coming in. So more positive charge leaving the cell than entering. This difference of charges generate...	[ "To make up for the flavor lost when processing and storing. Even though the nutrition value does not really change, the flavor does. Sodium is very versatile. For example normal salt (sodium chloride) for a salty taste, but also msg (monosodium glutamate) for umami. Most processed food flavorings contain multiple...
What happens when swallowed food "goes down the wrong pipe"?	[ "The body isn't a perfect system, so sometimes the Epiglottis doesn't fully block off the Trachea when you swallow. If food does go down the Trachea, a cough response is triggered, and you cough it back up out of the Trachea, then you can swallow it down the Esophagus." ]	[ "Your immune system is pretty beastly. Keep in mind the environment in which the human body was conditioned for included ravaging diseases and general filth. Our immune system has adapted to combat common environmental microbes and pathogens through built up passive immunity. Unless the fly transmits something spec...
How can/why does the US allow non-citizens to serve in it's military?	[ "Just showing up to the military doesn't mean they're going to give you access to information or weapons. There's extremely thorough background checks and lots of controls for who can touch what, and who can know what and when. A buddy of mine, born and raised 'Murican, still had to spill pretty much his entire li...	[ "I would recommend that you read [this](_URL_0_) article. It's written by Christopher Hitchens who volunteered to undergo the water boarding process. The tl;dr version is best summed up by Hitchens himself > You may have read by now the official lie about this treatment, which is that it “simulates” the feeling of...
Why do bunker freezers still work in grocery stores even though they have no lids to trap cold air inside?	[ "1. Cold air sinks while warm air rises, so unless there's a strong breeze it's not really going anywhere. 2. Some of them generate an artificial recirculating cold breeze (an \"air curtain\") to further limit unwanted air flow." ]	[ "[This image](_URL_1_) is not a 747, it's a Fokker - but you can see on this type of aircraft how reverse thrust works on jets much more clearly than on a 747. The Fokker deploys buckets behind the jet exhaust. These buckets reflect the exhaust forwards, instead of the normal mode where jet exhaust goes backwards. ...
What evidence do we have that Joan of Arc's victories during the Hundred Years' War were not merely a coincidence?	[ "[This older answer](_URL_0_) by u/sunagainstgold may be of some interest to you." ]	[ "Is this a homework question? It says in our [rules](_URL_2_): Our users aren't here to do your homework for you, but they might be willing to help. Remember: AskHistorians helps those who help themselves. Don't just give us your essay/assignment topic and ask us for ideas. Do some research of your own, then come t...
With a heavy vehicle trying to stop on snow, what is the relationship between the higher mass increasing traction on the snow, but also increasing the momentum that has to be stopped?	[ "Putting weight in the back of a pick up is strictly to get enough traction to drive. Rear wheel drive pick ups don't have enough weight over the wheels otherwise. Most cars (I don't know of any non-sports cars) are front wheel drive and has the engine pushing down on those wheels to keep them from spinning (to a d...	[ "All possible paths for a massive particle satisfy (d-t) < 0 and t > 0, where d and t are the spatial and temporal vectors respectively from the first point to the second. So you can't move from (d=0, t=0) to (d=1, t=0); no allowable path links one point to the other." ]
how bidets work/are supposed to be used. how does it cut tp use so much?	[ "Okay, here’s the deal. A bidet attachment sits on your toilet, so after you go, you can directly spray the area with pressurized water. All of this is happening inside the toilet bowl, so there’s no mess to deal with. Compare having to wipe several times with toilet paper and still not being totally clean, vs. usi...	[ "Your bumhole doesn't open up completely. Poo gets squeezed out, it doesnt fall out. If some water does splash up it doesn't go into your bumhole, it stays on the outside. I'm going to do some experiments and I'll let you know exactly what happens." ]
How did my surname, and English surname, end up belonging to my Catholic ancestor who immigrated from Ireland in 1850.	[ "Can't figure out how to post a non-top-level answer. (If it's wrong to post any information that is relevant but less than top-level, I apologize, and please remove this.) My family has the same situation. The oral record handed down is that our name in Ireland was Curry, but that when we arrived in America we ado...	[ "I believe the general consensus is that it was a Greek invention (Aristophanes mentions pastries in The Clouds, so 5th Century BC at least), but the pastry was used to carry and preserve the contents, rather than being designed to be one edible article. The convention of eating the crust came far later during late...
Why are human races like Asian and Caucasian not considered as a subspecies but animal's like cats (example) say Persian and Maine Coon are considered subspecies?	[ "They're not. Persian cats and Maine coon cats are breeds - all of them are Felis catus. Asian people and Caucasian people are races - all of them are Homo sapiens sapiens." ]	[ "Imagine you have a Grey squirrel population in Arizona. All of a sudden, a grand canyon appears in the middle of their territory. The canyon is too big for squirrels on either side to traverse across, so you can effectively say you have two populations of squirrel that will never meet. Now progress millions and mi...
Why is it that for many people their behavior completely changes when they are in a car or on the internet?	[ "When you're talking to someone face-to-face, you can get a better sense of what people intended to say based on their tone of voice and also their reaction from their facial expressions. For example, it's easier to hear sarcasm than it is to read it. Likewise, people can silently express their apology through thei...	[ "When you talk normally, you're generating the words, tone, and rhythm from your head before you open your mouth; when it's time to read, you have to look at the words manually and recite them one at a time, and you may not be able to anticipate how the entire sentence or line is supposed to sound. If you get a cha...
How cold can you make water?	[ "If you put water in a blender and cooled it you would form a slush at exactly the normal melting point. It wouldn't form a monolithic block of ice due to your agitation but that mixing would not stop it from transforming from a liquid to a solid. It is possible to get supercooled water if you do it carefully in a ...	[ "Yea, the effect will be weak, but it will be there. The hydrostatic pressure in a column of fluid on Earth can be estimates as pgh, where p is the density, g is Earth's gravity, and h is the height. So let's take a slightly exaggerated example and say the stock pot is 1m in height. Then plugging in the numbers for...
Why do people feel more comfortable using bad posture (slouching,leaning) than good posture?	[ "Good posture generally uses muscles to hold you in a certain position, requiring effort. Slouching basically means relaxing these muscles and letting the weight of your body rest on ligaments and joints. It’s always easier to not put in effort. Also, slouching is only really bad if you do it for a long time with ...	[ "I love art history, it's been a while since I studied this subject but I'll explain to the best of my memory: There are a couple of reasons, one major one being that the drawings interacted with heiroglyphs in such a way that they were sort of their own writing system. The drawings weren't intended to be art, they...
When we hurt something like our wrist we either wrap it up to make it warmer or put ice to make it stop swelling. Whats wrong with just the regular body temperature?	[ "Not a bad question. The point of an ice or warm wrap isn't to control the body's temperature. Rather, it's using temperature as a tool to illicit a response from the body that could assist healing or manage pain. Ice, for example, can help reduce swelling in a broken wrist. Heat can relax injured muscles and incre...	[ "The actual energy difference is very slight compared to the chemical energy in the food. If you drink a liter of water that was about to boil, it would only be about 60 calories. 1 food calorie (kcal) is what it takes to heat/cool a liter of water by 1 degree, and your body is about 60C below boiling. Not sure on ...
Why was the Bren designed with the magazine above the rest of the gun?	[ "While not directly addressing your question, you may be interested in the replies to an earlier question about the placement of magazines on sub-machine guns. _URL_1_" ]	[ "lots of low bridges and efficiency are the main reason. A bendy bus can load and unload at twice the speed. Also less handicap accessible. The ones being use in the US are in very few cities or just for fun. I know the one that started up in Las Vegas, is more for fun than anything else." ]
Whats the largest body of mass that can collide with earth without destroying everything?	[ "That would depend on how fast such a object is traveling at." ]	[ "Have you ever wondered what's inside your bouncy ball? Imagine it was too small to cut but you really, really wanted to know. What you might want to try is throwing it into something so hard that it breaks and you can see the smaller parts. Of course, if you only have another bouncy ball because that's the only th...
How accurate is Charles Dickens representation of winter in Great Britain 170 years ago?	[ "Dickens' description of winters were based on his own childhood. A White Christmas is very unusual in London, but by the time he was 9 he'd seen 6 of them as the first decade of his life happened to coincide with the coldest decade in England since the 1690s." ]	[ "Follow-up question: I once read on this sub that the Tasmanian Aborigines of Australia gradually lost the technology of cold-weather gear after Tasmania was separated from the mainland. Well, it gets bloody cold in Tassie, so how did they cope?" ]
Did the Japanese eat sashimi (raw fish) before the invention of freezing?	[ "Before the invention of refrigeration, most if not all sushi was made by packing the fish with fermenting rice to partially preserve it. This type of Sushi has been eaten since at least the 8th century (probably more like since the 2nd), so yes, well before freezing was invented. Also, traditionally, fish that liv...	[ "As an additional question: How would these relationships start? Would there be a sort of match making service via a third party or through the parents of the eromenos/wakashu?" ]
Why do evangelical Christians strongly support the nation of Israel?	[ "They believe the coming home of the world's jews to Israel is a sign of the end times. Evangelicals tend to believe in the rapture and all that stuff, and the soon to come apocalypse. Israel plays a part in that. When the time comes, all the jews in Israel will be converted to Christianity." ]	[ "The LA Times had an article that told the story of a modern family in New Mexico that had the curious tradition of lighting candles on Friday nights. The article went on to describe how they eventually discovered their Jewish heritage going back to the conquistadors. See _URL_0_" ]
How different were sexual positions from different eras like the middle ages from now?	[ "A couple of archived threads contain a lot of good information. From February 2014, [this one here](_URL_6_) has a top-level comment about medieval Europe and a lot of further information in the comments below. And then [this one](_URL_5_) covers Rome, South American cultures, China, Japan, ancient Greece, and anc...	[ "Is there a specific region and time period you are interested in? If not, your question would break our \"poll type\" question rule." ]
How was Hitler a good public speaker?	[ "Whilst you wait for some good answers, [most of this is covered in the Wiki](_URL_3_). [This post](_URL_2_) by /u/OnkelEmil is close to what you're asking about but your secondary question about his particular speaking style is interesting and I can't recall it ever being asked here before. (edit was because of a ...	[ "Even if you speak English, you run the risk of using the wrong word. Small intricate mistakes in words could blow up in your face when you're a world leader." ]
Why can animals eat raw meat and humans cannot?	[ "Humans eat raw meat all the time, ranging from fish to [horse meat](_URL_4_). All food carries some risks that you'll get sick from eating it (\"pathogens\"), and various things can limit those risks, like [proper cleaning and storage of meats](_URL_0_), freezing meats to [kill bacteria](_URL_3_), and only using m...	[ "For the same reason we prefer drinking cold water to warm water. It makes no difference, but we prefer the taste/feel of cold water in our mouths." ]
The world record for the men's 100m is 9.58s. However, the world record for the 4x100m relay is 36.84s, an average of 9.21s per leg. How is this possible?	[ "The 100 is a very short race and it has a standing start, so a large portion f the total race time is spent getting up to speed. In the 4x100 only one of the 4 runners has a standing start, the rest are handed the baton at as close to full speed as possible. So the standing start is less of the total time. If you ...	[ "Humans produce about 1kg of CO2 per day. This is 22.7 mols of CO2. The simple equation for respiration of glucose is C6H12O6 (s) + 6 O2 (g) → 6 CO2 (g) + 6 H2O (l), so 22.7 mols of H2O will also be produced. This is about 410ml, or less than two cups, of water per day, total. If you take 20,000 breaths per day, yo...
Just how much less nutritious is food that has been frozen such as frozen fruits/meals	[ "frozen food, if frozen very close to the time they were picked, actually have more nutritional value than \"fresh\" ones in the produce section or in cans" ]	[ "Not a huge amount, really. We already pretty much know what's in these products (I mean, with Coke, you can basically just read the label). The difficulty is only getting the exact formulation and mixing right. For most people, the prohibitive part of that is not knowing how it's done - it's having access to the k...
why is it that land that was hit by an atomic bomb (Hiroshima/Nagasaki) is fairly quickly re-inhabitable but sites like Chernobyl and Fukushima take decades to be radiation free?	[ "The atom bombs in Japan were airbursts - they didn't blow up on the ground. This resulted in maximizing destructive potential, but very little fallout that spread radioactivity to debris. A nuclear power plant like Chernobyl has many, many times the amount of nuclear fuel in them. Then, the plant exploded, spewin...	[ "In the way olden days, if you went around having sex with anyone, you'd have no idea who actually fathered the child. Cultural norms grew around the realization that if you were monogamous, you could safely assume the identity of each parent. This is critical to the natural human family nucleus. We don't see this ...
Why does my arm tingle when I hit my funny bone?	[ "Your \"funny bone\" is actually a nerve (the ulnar nerve). When you bang it, all the parts of your arm that the nerve goes to get tingly. Generally, there aren't any other nerves that are close enough to the skin that you can bump and get that same feeling." ]	[ "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,...
What's the difference between a crossover and a station wagon?	[ "> Are crossovers just taller wagons? Basically, yes. > Is the distinction just a marketing scheme For the most part, also yes. Station wagons were considered boring and decidedly uncool in America. But, crossovers were marketed as being the hip new thing to avoid the negative associations with station wagons." ]	[ "I usually explain it to my friends using phones: & nbsp; Switch - You can call anyone in your area code but can't get anyone outside of your area code. & nbsp; Router - You can call people in your area code(switch), but anything not in your area code is forwarded from the switch to the router. The Router can for...
If Congress refuses to allow a new Supreme Court Justice to be appointed, can the Supreme Court still function? Could anything be done to force them to accept someone?	[ "Yes, and the Supreme Court has continued to function. To be fair, it has avoided some cases and a few controversial legal issues remain undecided. This can create a long-term problem, but the Court is getting by. As for fixing it, if this goes on long enough, the President can appoint a justice in a recess appoint...	[ "Compared to Europe, the US has very few choices in the ISP market. Many people are limited to only one or perhaps two broadband internet providers they can 'choose' from (e.g. the local Cable Company and/or local Telephone Company). This has led many ISPs to engage in anti-competitive practices that break the prin...
Why are Animals scared of us Humans?	[ "Because most animals evolved with humans and other animals trying to eat them. Not letting predatory animals near you is an important survival tactic. There of course are exceptions. Domestic animals have been bred to trust humans to an extent. Animals can be tamed or trained to see humans as non-threatening or to...	[ "Horse meat isn't rare at all. You can get it in many parts of europe. Tastes ok too. Anyway, that's culture. The same reason we think that bacon and eggs is a breakfast food, and don't eat grasshoppers." ]
Why do I cough my lungs out when ever I clean my ears.	[ "It's called Arnold reflex, casued by irritation of auricular branch (innervates external acoustic meatus) of vagus nerve (one of twelve cranial nerves). It's one of cough reflexes associated with vagus nerve, though this one is not common for everyone." ]	[ "Tightening the skin and muscles around your eyes can press on your tear glands and push out the fluid. If you didn't scrunch up your face while yawning you probably wouldn't tear." ]
Have their been any more gravitational wave detections?	[ "There have been [six](_URL_0_) but they don't announce new ones immediately. In fact, the last one wasn't announced, just published." ]	[ "To give a slightly different example that /u/Vampire_Seraphin's a current excavation off of the coast of Sri Lanka at a fishing village called Gotavaya is the first marine excavation of an ancient shipwreck in Indian waters. It is dated from the first century BCE/CE, which was the peak of the ancient trade, but as...
How is stainless steel made, and why is everything metal not made of it?	[ "Stainless steel is a group of steel alloys with high chromium and low carbon. This makes them significantly more resistant against corrosion but the low carbon content means that it's flexible and not very strong We often use high carbon steel for items that we want to heat treat and make extremely hard. There are...	[ "Phones are already expensive. Using the absolute best parts available at the time to create some überdevice would cause the price to skyrocket and only a select few people would be able to afford it. It would probably cost the company more money to put something like this together than they could earn by selling i...
European Union; a crime in Nazi Germany?	[ "The European Union was the name of a resistance circle centered around the Berlin physician Georg Groscurth. The group held political positions akin to the SPD (ie loosely Marxist, and geared towards creating a socialism that transected national boundaries) and had connections to the KPD. The circle also aided som...	[ "Power efficiency is challenging. Anybody can make a low emissions vehicle, the question is can they make a sporty and fun to drive low emissions/fuel consumption vehicle? That is difficult. VW claimed they created such a vehicle, when they actually hadn't. They cheated on the tests so they could market their cars ...
Do we know about any muslims participiting in the settlement of the American west? If so, what was their experience like?	[ "This is not a direct answer to your question, but may lead you to some primary sources. The Mother Mosque of America in Cedar Rapids, Iowa was erected in the 1930s. It is considered to be the first permanent building specifically used as a mosque in the entire United States. Though built well after initial settlem...	[ "You're going to need to narrow down your time frame here, keep in mind you're asking about a time frame of 1000 years over a very, very large area of land with vastly different cultures. You'll be more likely to receive an answer if you narrow the question down to a more specific time." ]
If vaginas go back to their normal size after sex, how come girls have looser vaginas?	[ "The vagina is a muscle. Yes, it can lose elasticity through age or trauma (having a baby), but while sex may stretch it a little for a day, it'll go back. Think of a vagina like a rubber band. You can stretch it, and when you let go, it's normal again. Some women are born with wider vaginas than others, the same w...	[ "Every time you make a copy of a cell, there is a chance for errors. For example when you photocopy a first print, it is pretty crisp and close to the original, but there are a few minor discrepencies. Now if you photocopy the copy, it gets more distorted, and so on until some letters get hard to read, it gets diff...
What is fire and what gives it color?	[ "Fire is what we call the effect we see upon combustion. Combustion is the release of energy from a substance as heat. This is only one form of energy, and that's why it's possible to have varying intensity of temperature and brilliance, and reactions that give off energy more in, say, the IR spectrum (infrared str...	[ "It's not actually the heat you see, but the effect of the hot air. Hot air expands and becomes less dense than the cool air around it. When light travels between objects with different density, it gets refracted (the direction it moves in is changed). You might remember images of a laser pointer shot into a fish t...
Why wouldn't matter falling into a black hole decrease entropy in the universe?	[ "This is a very good question. If you'd asked it in the early 70s - and guessed at the solution - you'd have become super famous. Instead, Israeli physicist Jacob Bekenstein (recently deceased) did and he got all the credit. Bekenstein conjectured that the answer is that black holes have entropy of their own, calle...	[ "Every object's gravity is stronger the closer you are to it. Until you get close to its event horizon, a BH's gravity is almost the same as that of ay other object with the same mass." ]
If the pressure at the depths of the ocean can get up to 1,000kg, how can creautres survive without being crushed? (Or am I thinking about "pressure" incorrectly?)	[ "The pressure inside the animals is the same pressure as outside. They are breathing water that is at the same pressure, inside and outside are in equilibrium. Things get crushed when the pressure inside is less than the pressure outside." ]	[ "Octopuses are very soft, and their muscles can squeeze their body into a lot of different shapes. Under their skin, they have color-filled cells that are like balloons. They can squeeze the balloons to make different colors pop put on the surface of their skin. They can also squeeze their skin to be rough and rock...
If an electronic device or machine is hit by an EMP powerful enough to knock it out, what will you have to do to get it running again?	[ "When electricity pass through a wire it creates an electric field around the wire. Similarly when an electric field is close to a wire, it makes a small amount of electricity pass through the wire. EMPs generate massive electric fields so they can make large amounts of electricity pass through wires over a large ...	[ "How would you get it there? Pound for pound, going to the moon is expensive. Really expensive. How would you service them? Getting a technician up there is really really expensive. How would you protect them? Earth has mild temperatures and magnetic protection from solar flares. The Moon doesn't." ]
Have we mapped the brain on the level of individual neurons? Maybe for a fly or a spider? Shrimp?	[ "We did it for a 1mm long worm Caenorhabditis elegans (though it actually has no brain, only a nervous system): > It is one of the simplest organisms with a nervous system. In the hermaphrodite, this comprises 302 neurons[15] whose pattern of connectivity, or \"connectome\", has been completely mapped and shown to...	[ "I have only a passing familiarity with his research, but [Richard Davidson](_URL_0_) studies the neuroscience of meditation. You'd have difficulty studying how someone blocks extreme pain due to the obvious IRB issues. Edit: Just based on a ctrl+F of his CV, you might start with Perlman, D. M., Salomons, T. V., Da...
Another Evolution Question.	[ "The genetic variation on which natural selection acts may occur randomly, but natural selection itself is not random at all. It is a very organized, precise system. \"New Findings Confirm Darwin's Theory: Evolution Not Random\" _URL_2_" ]	[ "Yes, there are many examples. These are just a few: * Chimpanzees: [Ex. 1](_URL_2_), [Ex. 2](_URL_3_), [Ex. 3](_URL_0_); there are [many more](_URL_1_). * [Monkeys](_URL_6_) * Whales: [Ex. 1](_URL_5_), [Ex. 2](_URL_4_) * Birds: [Ex. 1](_URL_8_), [Ex. 2](_URL_7_)" ]
Why do games need to restart in order to change certain graphics settings (e.g. resolution) but not certain other ones (shadows, etc.)?	[ "Think of the software like a building. When you construct it, certain specifications (settings) need to be determined as the foundation of the building. If any of these specifications need to be changed, you may have to tear down the building and make a new one. However, the furniture/wiring/plumbing inside can be...	[ "Imagine driving a long distance on the road. Your destination is 160 miles away, so you drive along the highway at about 80mph and figure that you need about 2hours total. Then, in the middle of that 160mi, the road gets very bad (you had no chance of knowing that) so you can drive only 50mph. You don't know if th...
How can every movie be ‘the #1 movie in America ‘?	[ "Because it is the #1 movie watched THAT weekend. When the weekend changes, or the next movie comes out then it can change." ]	[ "They don't. It's a marketing ~~lie~~ gimmick. I used to work for a company that did a similar thing by mail. New customers were supposed to sign up by a certain time for special rates but as a specific matter of policy we'd give those rates to anyone who mailed back the special offer." ]
What are some good sources on ancient/middle age Eurasian nomad cultures?	[ "\"The Silk Road: A New History\" by Hansen is a good document-based summary of the cultures that lived in Central Asia in that time period. Not necessarily the ones you're thinking of though; it talks a lot about Sogdians, Tocharians, Uyghurs, etc. \"The Horse, the Wheel and Language\" covers pre-historical Euras...	[ "Is there a specific region and time period you are interested in? If not, your question would break our \"poll type\" question rule." ]
Would I die of radiation poisoning If I lived in a house made of just banana?	[ "No. You'd die of suffocation after your silly banana house collapsed on you. To address the radiation question, and the commonly quoted stats regarding the content in a banana, that is also a no. It is a figure that uses a common and rather comical everyday food to express the idea that there is a set amount of ra...	[ "You're right that zinc is not considered safe in that application. What leads you to think the can is galvanized? Tinplate is commonly used for this purpose - see the following article, which discusses industry use of tinplate and its safety: [Tin in canned food: a review and understanding of occurrence and effec...
What is Oxytocin? How does it affect the different genders?	[ "What did the post say that you're calling in to question? Explaining all of the effects of oxytocin is a multi-hour lecture. [The wiki](_URL_0_) may not be a bad place for you to start." ]	[ "If I recall, they switched after WWII, and not because of the Nazi's use of pink for homosexuals, despite popular belief, but because of marketing to make women's clothing \"pop\". Initially, I believe boys had pink to represent Mars, and girls had light blue to represent Venus." ]
Why does the US Government keep on raising the debt ceiling incrementally and passing stop gap funding bills? Why don't they just make the ceiling higher by a huge number so government shutdowns happen less often?	[ "Because politicians are douche bags. The idea is that if they regularly bring the debt ceiling up, they have a wedge issue to use to fund raise, to bicker over and the use as a bargaining chip for other legislation. They friggin' passed the budget that is causing the debt to increase and then fight over raising th...	[ "Say you have a hammer and nail. If the hammer head is bigger than the nail, then the force of the hammer is distributed evenly against the head of the nail. The nail will go straight into the wood. Now say you have a hammer and a nail, but the nail head is bigger than the hammer. When you hit the hammer against t...
How were books & newspapers mass produced before the invention of computers?	[ "The history of the printing press from Gutenberg to computerisation. _URL_0_" ]	[ "So, just to be clear, based on what you describe in your post I am pretty sure you committed [mail fraud.](_URL_0_) Not a judgment, just a note that your nearly free CD's may have come with a sizable risk of imprisonment and large fines. Second, Columbia House made its money because you only got the first record ...
What is ethnicity? Is it related to ancestry at all? Or is it only referring to cultural aspects?	[ "Ethnicity is basically a combination of culture and ancestry. A group of people sharing ancestry and common traits like religion, language, cultural norms, etc. Though everyone in the ethnic group doesn't always share these same things, it's common. You can't choose your ethnicity, it's about where your family is ...	[ "The first 100 issues of an important UK archaeology monograph series, East Anglian Archaeology, were recently made available [for free on their website](_URL_0_). These are site reports - publications of archaeological data - for the UK counties of Norfolk, Suffolk, and parts of Cambridgeshire. The series includes...
How peeling scotch tape in a vacuum creates radiation.	[ "The phenomena is triboluminescence. It's not entirely understood by science, but what we think is happening is that when the tape is peeled, it creates charge (e.g. one surface keeps an electron when they're ripped apart). That charge quickly recombines, which--in air--ionizes the air and makes light. Absent of ai...	[ "Probably because your ears are sensitive to the particular frequency those wraps emit when being handled. Not everyone is, though." ]
How can you have an arrest warrant issued for something like missing jury duty when there is no proof you ever received notice?	[ "You would have received several certified letters prior to a warrant being issued. Someone else (like a parent or room mate) may have accepted them then failed to inform you, but the legal requirements have been satisfied. You can contact the court and have them schedule a jury duty date and rescind the warrant." ...	[ "There are marks along the highway at measured intervals. A plane flies overhead, timing cars as they pass these marks. They radio to the cruiser on the ground a description of the car, who then stops them and writes the ticket." ]
Why haven't we invented ray guns yet?	[ "I mean lasers exist but even if ray guns existed, they likely wouldn’t look like what you see in movies with a visible beam flying through the air" ]	[ "They do. Buy a tesla! (Or wait for their cheap model)" ]
Why does club soda remove stains better than water?	[ "It doesn't. Carbonated water does not remove stains any better than regular water. This is just an [old wives tail](_URL_0_). The common reasoning, if any is given, for it is because when carbon dioxide is dissolved in water, it creates a substance known as carbonic acid and acids can help clean (see lemon juice o...	[ "\"One of the most common ingredients used was dihydrogenated tallow dimethyl ammonium chloride (DHTDMAC), which belongs to a class of materials known as quaternary ammonium compounds, or quats. This kind of ingredient is useful because part of the molecule has a positive charge that attracts and binds it to negati...
How does certain medication/supplements that you take 'under your tongue' work?	[ "The medication absorbs/passes through the mucous membrane under there. There are a lot of blood vessels under your tongue, so it's able to get into your blood stream faster than if you swallow it and it has to go through your digestive track." ]	[ "Because they work. Scam artists and lazy people see an idea that brings money for little work, and they emulate that idea. Why fix something that isnt broken, right? Similar idea to why there are a million different versions of Minecraft and Bejewelled. The people peddling these things aren't innovators. They don'...
why does blood pressure raise abnormally when getting angry or stressed out?	[ "When you get stressed your body released more of a hormone called cortisol from your adrenal glands. This hormone among other things increases blood pressure. The point of a stress hormone like cortisol is to help when you're distress \$like sick, or fighting/running from a saber toothed tiger\$. The problem is ...	[ "Someone correct me if I am wrong but it goes back to when we had much hairier bodies and when alarmed we as well as a lot of other mammals would puff up our hair to make ourselves look bigger. Think of how when you scare a dog or a cat it hunches up and its hair stands on end, same thing happens to us just we dont...
How is Gavrilo Princip viewed in Serbia today?	[ "Although this question is likely violating the 20 year, the WWI centennial has caused some focus on the expressions of commemorations and historical memory. NPR had a good report, [The Shifting Legacy Of The Man Who Shot Franz Ferdinand](_URL_1_) and Smithsonian magazine had an article in 2000 [\"Searching for...	[ "Worth pointing out that the Enola Gay's place in history is not unanimous in the US--indeed, there was a [famous controversy](_URL_0_) surrounding the Enola Gay exhibit at the Smithsonian some decades ago." ]
Why complex executions as opposed to a bullet?	[ "You may be interested in these earlier posts which touch on the purposes of public execution * /u/idjet in [During medieval times public torture and execution was commonplace, how did this effect the general population, did they become desensitized to gruesome death?](_URL_2_) * /u/TheFairyGuineaPig in [Are there ...	[ "People care less about obeying rules when they are about to die. At this point what do they have to lose? Did Jerry over in cell D12 make a rude comment about your mother? Maybe Jerry should get stabbed 12 times with a sharpened tooth brush. What are the guards going to do about it? Kill you? lol!" ]
Why do some airports make transit passengers go through security again and others don’t?	[ "As /u/TehWildMan_ said, international flights can force you to go through security again. But, even within the same country you might have to pass through security when connecting between flights. The common reason for this is that many airports have multiple terminals which are physically separate buildings. Thos...	[ "it has ot do with efifciency and the body not knowing any better since its acting on a blind cycle expecting fertilization to happen. if no fertilization occured, there's no point keeping that tissue(and the egg) aronud until the next cycle, plus that tissue is only there due to hormonal changes meant ot facilitat...
Why do I go through mind bending theories and make grand plans for the future before falling asleep, but they become null once I wake up in the morning.	[ "When it's dark and quiet at night your senses like sight and hearing become kind of null, due to the lack of things to look at/listen to your mind starts to work overtime coming up with all these mind bending theories. As for future plans, it's easier to be in your nice, warm bed thinking about being a better pers...	[ "Not a neurologist here, but I had read certain articles way back that explain our learning process. It was sort of like: we learn a certain thing while we are conscious, but this certain thing we learned is only stored as short term memory while we are conscious. The brain processes this information during sleep t...
What other mammals can have twins beside humans, and what is likely hood of it happening compared to humans?	[ "Are we discussing identical twins or fraternal twins? Animals that produce multiple eggs in a batch have brothers and sisters that would be called 'twins' by the fraternal definition. So, in animals that produce more than one offspring like rats, mice, dogs, cats, lions, and others would technically have 'twins', ...	[ "All the time our cells get damaged and dies. New cells are created in order to replace them. Every time cells copy and duplicate themselves they have to copy and duplicate the DNA, too. The DNA is ordered in sequences called chromosomes. When a chromosome is duplicated, a short sequence of the DNA at its end gets ...
How many terms can an ex-VP stand for if they are elevated to presidency?	[ "If you serve more then half the term, it counts. If you serve < 2 years, you can have your own two full terms." ]	[ "Productions will usually have an insurance policy on the wellbeing of their actors. A good example is Paul Walker, who was contracted to complete fast 7 and another 3 films after that. After his death, the insurance company paid out a considerable sum of money, which was used to pay for the CGI and whatnot to all...
How exactly does bleach kill bacteria and viruses	[ "The chemicals of life only work well in very specific environments. If a chemical is forced too far outside of the environment it is meant to work in, they can break apart. The main chemical in bleach has the same effect on many of the chemicals of life as extreme heat, causing many of them to break down. This kil...	[ "> yet our immune system can fight it off The difference with HIV is that it directly attacks your immune system, so obviously your immune system cannot fight it off. You don't die of AIDS directly, you die from the common cold or whatever else you catch, because you don't have a working immune system anymore." ]
Why is it that the average height for some countries are higher than others. For example asians are typically shorter..	[ "A large portion of it is genetic. Specific ethnic groups tend to be taller or shorter. But diet is also a large factor. Take North and South Korea. They are the same general ethnic stock, but South Koreans tend to be noticeably taller than North Koreans because South Korea did not have prolonged famine like North ...	[ "There is a genetic predisposition to seek out the exotic. In social terms, this is expressed very easily through finding folks that look similar enough but sound different enough to demonstrate that they are from a different genetic pool. This is one of the many remnants of our evolution that keeps us from inbreed...
What actually destroys a cell when it runs out of oxygen?	[ "The reason a person dies during asphyxiation is due to the acidification of the brain, and specifically the cytoplasm of the brain cells - oxygen is used as a terminal electron/proton acceptor. During cellular metabolism, the first step, glycolysis, creates free protons. The last step uses oxygen to absorb protons...	[ "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...
Why do most metals glow brightly when heated, but some like aluminium don't?	[ "If you heat up steel and aluminium to the same temperature, they'll glow more or less the same colour. The difference you're seeing is that aluminium has a lower melting point than iron, nothing else." ]	[ "Basically, we're not looking at the colours as one would normally look at colours. Instead, you're looking at the spectrum. [This is an image showing the spectra of several galaxies.](_URL_2_) See the spikes? We know exactly what part of the spectrum those spikes should appear in if there's no red shift or blue ...
Do quasars still exist today, or are they just long lost remnants of the primordial Universe?	[ "The differentiation between quasar and AGN (active galaxy nucleus) is completely historical. In earlier times photography couldn't depict the surrounding galaxy with the heavily outshining nucleus, which was located in an area not bigger than the solar system, hence the name quasar (quasi stellar). As time went...	[ "Galaxies do form [star clusters!](_URL_2_) There are two main types, open (like the [Pleiades](_URL_0_)) and globular (like [M 68](_URL_1_)). However, these are on much smaller scales compared to the spiral arm." ]
How do our cells know what to do and if there's something that tell the cells what to do, how does that something know what to tell the cells and so on?	[ "Simply, the DNA contains the instructions for all cellular responses, everything from replication to repairing damage to converting air/water/food into useable proteins. I’m not a scientist, but I have taken a couple of biology courses over the years." ]	[ "Satellites are on a set orbit. The scientists put the satellite into that orbit to begin with, so they know when and where in space the satellite is going to be. When they launch a new satellite, they just calculate the appropriate trajectory and launch time to get the new satellite into space without hitting the ...
Why is gold valuable to governments?	[ "Gold in hard to find and mine which means there will not be a flood of gold on the market anytime soon. It is also very stable in any condition which means you can store it anywhere without having to care about packaging it or keeping the right temperature or humidity. And lastly it is valuable on the consumer mar...	[ "Usually, historians look at how much of a certain crop - often things like wheat or barley or something similar. It varies with the region - could've been bought with a certain amount of money. If you then look at how much of that crop could be bought with today's currency, you've got some frame of reference about...
Why do Libertarians push for the abolishment of the Federal Reserve and the return of the Gold Standard?	[ "Something we need to remember as we suggest more prudent fiscal policies is that U.S. spending/borrowing has increased so greatly that it has exceeded the world'd gold supply. The [entire world's collection](_URL_0_) of gold (roughly 165,000 metric tons), even valued at today's high price of $1,600 per troy ounce,...	[ "Ha, I wrote a paper on this once. If I had to boil it down to one cause... I would say its the fact that in the US railroad infrastructure is (mostly) owned by private companies, which is fairly unique in the world. The US has the most sophisticated and impressive freight railroad transportation in the world (thin...
When people poisoned wells in ancient times, did it mean the permanent loss of that well? What happened to poisoned wells after a war ended?	[ "So does a well become drinkable again in time or not?" ]	[ "That's called a \"Statute of Limitations\", and the time limit is different for all sorts of crimes. Typically, the more severe a crime, the longer the period in which you can be charged. Some crimes, like murder (I think most places) has no limit. The rational is that, for minor crimes, if you have gone a certain...
How does an ISP plug into the internet?	[ "The ISPs are the hubs that form the internet backbone and they connect to each other, and by extension the various servers and computers that connect to the ISPs and you have the internet. As to who runs the infrastructure, that varies by country but in general it is the ISPs. Individuals cannot directly tap into...	[ "It all depends on what happened. Alot of times, it literally is because some construction crew dug where they weren't supposed to dig and cut the line. Other times it could be that some piece of equipment is misconfigured and they need to call in a 3rd party or the OEM vendor to fix it because none of the staff h...
If two notes are played together at equal volume, is their sound twice as loud as the sound of only one note?	[ "Short answer: no. When two notes of equal loudness sound simultaneously, their energies will add together. But our ears do not perceive the energy of sound as its loudness in a one-to-one fashion. There is what is called logarithmic relationship. Let's assume audible loudness of a sound source to measure as 1. In ...	[ "Making some simplifying assumptions (eg friction doesn't exist)... yes, all of them become excited. This is true for 1D strings too, not just for circular membranes. To illustrate, let's model a \"pluck\" of a string as meaning that at t=0, the string at rest but is deformed into a perfect triangle shape. Then we ...
Is there a reason that some stars appear to line up or is this purely down to chance?	[ "I assume you're referring to the constellations. Constellations have no physical meaning. I fact, they don't even really line up! Three stars that appear to be in a \"line\" in the sky are almost certainly at different \"depths\" in the sky. This is a little difficulty to explain because of the English language, b...	[ "It has to do with favorable directions for crystal growth. In the cloud, the moisture begins to condense into a solid, drawing from water vapor. The crystal would much rather grow on rounded or jagged surfaces over flat surfaces because there is stronger bonding. This means that straight edges don't grow well, but...
Why are companies allowed to use the term "natural flavour" to keep their proprietary recipe secret, preventing someone with a life-threatening allergy from knowing if they can consume it?	[ "Because then no one would buy their \"beaver anus\" flavored foods." ]	[ "It's libel if the claim can be shown to be untrue. If the claim is true, or cannot be proven false, it's not libel. And as /u/Melon-Tester says, there are ways of wording your article so it can't easily be proven false. Another trick is to make the claim in the form of a question: \"Did Angelina Jolie snort cocain...
How can a file which is deleted from a drive, freeing up the amount of memory it originally took up, then be restored?	[ "When you \"delete\" a file, you're just telling the computer to forget that it's there, and use the space when it needs to. The computer doesn't go and wipe that section of hard drive, because that would be a waste of time--it just overwrites whatever's there the next time it needs the space. That means you can ...	[ "So you're getting two different sets of answers based on two different readings of your questions. First, conservation of mass is a thing. Re-arranging molecules won't let you get a higher mass. Even fixing gasses probably won't get you there, because you are expending energy in the process of re-arrangement. Seco...
As a jet going mach 3 passes its own sound waves, it creates a sonic boom as a result of breaking through all of the built up pressure of its sound waves. If the jet slows back down to mach 1, will the sound waves catch up to it and create another sonic boom?	[ "A [sonic boom travels with the aircraft](_URL_0_). The boom zone is in the form of a cone, with its apex at the front of the aircraft." ]	[ "I'll answer quickly but I'm on my iPhone so I won't be linking a source. Shame on me. When you yawn, breath in deeply, or breath out forcefully, you create a pressure gradient between your chest cavity and atmospheric pressure. Try an upper airway Valsava maneuver, you should feel your ears \"pop.\" Your ear can...
Why are some state lines smooth, while others are jagged?	[ "Most of the wiggly ones are set to follow rivers, or in some cases to follow where the rivers used to be back when the lines were drawn. Back in the 1800s, it was a lot easier to say \"Kentucky is this side of the river, and Missouri is the other\" rather than try to pin down latitudes and longitudes. In places l...	[ "The border follows the crest of the Bitterroot Mountain range/the continental divide. This link has some interesting history on the surveying and geography: _URL_0_" ]
Why are there so many people of Black ethnicity in LA?	[ "As of the 2010 US census, the African American population was only [9.6%.](_URL_0_)" ]	[ "Different skin colours help in different climates, darker skin tones nearer the equator, lighter towards the North and south poles etc" ]
Why are copper salts like CuSO4 blue while copper is red?	[ "Because the absorption bands correspond to electronic transitions between orbitals. Changing what an atom is bound to will change the energy level differences. More specific to metal coordination complexes, one can analyze metal complexes via [crystal field theory](_URL_0_). Again, interaction with ligands can cha...	[ "The same way that astronomers find out almost everything. They use [spectrography](_URL_0_). Absorbtion colors - the specific colors of light that get emitted when light is absorbed by matter - tell you exactly what element or molecule did the absorbtion and emission. This process works with suns, atmospheres, pla...
Why do nations make it so difficult for foreigners to get permanent residency and citizenship?	[ "Short answer: If it were different, everybody would flock to the US, Europe and other rich countries. However, if a country really wants/needs you, the process can be much shorter. If you are highly qualified and a European company really wants to employ you, you can get residency quite quickly. It can also help...	[ "That's just it. It takes a while to amass information and use it. An animal just does whatever comes natural, aka 'instinct'. But humans are taught and trained and learn and practice and... and... Layers and layers of information and training to get us to the point where we can actually achieve more than the previ...
Who was the head of the Roman senate during republic times?	[ "There was a somewhat equivalent (although as any time when drawing comparisons between modern politics and Rome, one must be very careful -- although things may sound similar, once one starts digging under the surface, the differences can be profound). The princeps senatus was the (rough translation) \"first of ...	[ "While not a scientific answer to your question at all, I want to suggest the excellent movie [Before the Fall](_URL_5_) (German Titel: Napola – Elite für den Führer) to anyone interested in this topic, which is a story about pupils in an elite high school in the German Reich." ]
Can Weyl fermion particles escape the event horizon of a black hole?	[ "Mass generates gravitational fields, but everything is affected by gravity. Gravity is not a force in the way you think of forces. Light (photons) also have no mass, but they are affected by gravity. The key thing to understand is that gravity doesn't affect mass, it affects space itself. When something is moving ...	[ "/u/rantonels has covered the problem with the singularity part of the question but there are other problems too: 1) Any calculations in GR are purely classical so any (anti) commutation relations between fields aren't taken into account and therefore no PEP 2) The Pauli exclusion principle is about states not posi...
Why do so many languages employ the "masculine"/"feminine" type nouns?	[ "Gender is not a vital feature- and there are lots and lots of grammatical features which are not vital but languages have them anyway. English for example has tense, which many languages do not have and are fine without. \"Extra\" features such as gender and tense help communicate more information- making sentanc...	[ "France was a very major world power for a long time, and when the concept of veto power for a few nations was introduced it made sense to put France on the list. It still does in some ways, France is still a globally influential nation because of their contact with former colonies and wide business interests, and ...
The debate on Tesla vs Edison	[ "I'll try my best to explain this as unbiased as possible. A lot of people here think Tesla was the second coming of Christ, but in reality: 1. Edison was a businessman. 2. Tesla was a scientist/inventor. This is why Edison came out on top. Many people argue that Tesla could have brought technology so much farther....	[ "This submission has been removed because it is [soapboxing](_URL_1_.), [promoting a political agenda, or moralizing](_URL_0_). We don't allow content that does these things because they are detrimental to unbiased and academic discussion of history." ]
If the universe started with just hydrogen and helium and nothing else how did we get all the other elements?	[ "Nuclear fusion- what happens in stars- is literally smashing two atoms into one atom of a heavier element. So the initial soup of particles formed hydrogen and some helium, then those gases clumped together via gravity, until they were squeezed so hard under their own weight that some of the hydrogen formed helium...	[ "Copper was one of the first because it can be found in large chunks above ground. Stone or even wood can be used to hammer it into shapes. Also, clay can be moulded by hand into crucibles which can be used to melt ad mix metals." ]
Any topology experts care to explain why this doesn't produce a knot?	[ "It's pretty hard to explain in words. The topological concept that is being depicted is the double cover of SO(3) by SU(2), along with the fact that SU(2) is simply connected." ]	[ "Different amounts of traffic at different times. If its not too congested reddit will keep trying to serve you the page you wanted. If it is congested, it'll stop trying and give you that error page." ]
Why does pushing uncooked spaghetti into boiling water make it boil harder?	[ "When a foreign substance that bonds to water molecules is introduced, the specific heat of the water decreases. This means that the liquid water is now becoming vapor faster due to the fact that it takes less energy to initiate the phase change." ]	[ "When things get hot they expand (get bigger). Inside your engine are a lot of metal things that work best with a very specific amount of space between them, measured in thousandths of an inch. When your engine is cold the metal bits are smaller and those exact spaces aren't the size they are supposed to be. Get th...
Why do all the yummy foods have such high calorie amount or calorie density? And why does the human body want it so much?	[ "Sugar and fat are 2 good sources of energy, that's why your body craves them, you need them to stay alive. The problem is now it's much more easily available than ever." ]	[ "Advertising. Companies spend billions of dollars to instill that \"need to buy something\" in you, by bombarding you with messages (both overt and subtle) telling you that your value as a person is tied to owning things or \"treating yourself\". > Buy this $499 barbecue grill and be the envy of your neighbours! W...
Is there a reason, either mechanically or hydrodynamically, that a ship couldn’t have its propeller in the front, instead of behind? E.g. as a ‘puller,’ like a plane, rather than a ‘pusher?’	[ "The propeller is using Newton’s third law to force the water back this propelling the ship forward. If the propeller was in the front then the the water would hit the hull as it’s being accelerated and this would be counterproductive. I’m sure you could build something that works it’s just not the most efficient d...	[ "Pulling and pushing use different muscles. Your pulling muscles are stronger than your pushing muscles." ]
How do sites that don't display ads make money?	[ "As website you can make money by selling ads, but also by selling user data. Alternatively, the site is devoid of money making schemes as part of its growth strategy, and will monetize once it secures enough market share. Why bother showing adds when you barely get 100 visitors a day, better keep it add free to d...	[ "Usually through in game purchases. If you wanna play for free you can, if you wanna use a fancy gun or wear a tie dye speedo, you have to pay for that." ]

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