Split (3)

train · 273k rows

title stringlengths 0 299	text list
Why do boxers get injured more often than Muay Thai/Kickboxers who fought more often?	[ "Boxing has a smaller target zone, so more hits to the same area. Especially the head.\n\nBoxing uses big fat gloves to protect your hands so you can hit full force, even when punching the head which would ordinarily break your hand. Without those gloves, they have to hit lighter.\n\nThey can also hit other areas l...
Apache VS nginx	[ "Not really sure what \"asynchronous event-driven approach\" means, where did you grab that quote from? I checked the code on _URL_0_ and it looks like Nginx uses pthreads. ngx_create_thread() is their wrapper function for pthread_create(). \n\nHope you get an answer, now I'm curious." ]
why can't you drink an object floating in a glass of liquid?	[ "The object is floating in the water.\n\nAs you tilt the glass to drink, the object continues to float in the liquid (after all, water ~~is heavier than the object, and air is lighter than the object and the water~~ its mass is higher), which means the object will go up as you tilt your glass.\n\nThis is why it's h...
I can't really feel the difference between -20F and 32F as much as I can feel the difference between 70F and 80F. Why?	[ "How cold it feels (or how warm it feels; same difference in this context) has less to do with the absolute temperature of the air around you and more to do with how fast heat moves out of your body into that air.\n\nSee, your sense of temperature is all about something called thermoregulation. For reasons of c...
Why do some animals/humans stand still when something dangerous is approaching them?	[ "A lot of animals have pretty bad eyesight compared to humans. This means by standing still you can be harder to see. Movement though is easy to see even with poorer eyesight.\n\nCars haven't existed for long enough for there to be a greatly increased change in behaviour............ if it'd be selected for at all...
Why does scratching an itch feel so good, but the same pressure/force on a non-itch site feel painful?	[ "Scratching an itch makes it feel better because the scratches send more signals to the brain than the itch in that particular spot, and the feeling of the scratches distracts your brain from the itch. It doesn't hurt because you're focused on getting rid of the itch. \nItching is essentially small amounts of pain ...
Why would Snapchat turn down $3 billion dollars in cash from Facebook?	[ "Assuming it was purely a business decision: They're expecting their payout from holding onto it longer, either in direct profits or in a future offer, to be larger.", "It could be for multiple reasons that we will probable never know unless the owners come out and say. Some possible reasons that come to mind in...
Why is Scotland's national animal the Unicorn?	[ "If you lived in the birthplace of whisky, you'd be \"seeing unicorns\" too..\n\nHah - in all seriousness, the Unicorn is in mythology the natural enemy of the Lion. Since the Lion was adopted as the emblem of the English Royalty, it was natural that Scotland's emblem would be opposition to that. It is also worth...
Exactly, how are we running out of bandwidth?	[ "TL;DR: Bandwidth is not an infinite resource in and of itself. You can add to it by laying more cable and the various computing resources that control it - but that's not free.\n\nPicture two computers talking on the internet. One sends a request for a webpage. This gets transformed into electric or light or...
What exactly is it that causes some women to die during child birth?	[ "Sometimes she dies from an injury which induces labour. These tend to be things such as a car accident, a physical assault, etc.\n\nBut in general the actual cause of death is that they bleed out. Either the child is a breach birth, or they already have internal bleeding, or they have a serious wound and combined ...
If protons are attracted to electrons and repelled by other protons, what keeps them in the nucleus?	[ "It's one of the fundamental forces called the strong nuclear force. So while their charges repel them, this force is stronger and holds them together. It's very strong but very short ranged.", "All of the universe is run by only 4 fundamental forces. They are called Strong, Weak, Electromagnetic and Gravity. At ...
What is the sensation of spice? Sweet and sour are tastes, but what is spice?	[ "Short answer : It's pain.\n\nSpice comes from capsaicin stimulating receptors on your tongue. Those receptors perceive it as an irritant, which over time is associated as the taste sensation of spice.\n\nPeople with an insensitivity to pain can't taste spice, and in the same way, people who can't tolerate spice si...
Why are almost all songs played at major league baseball games played by an organ and why do they still do it?	[ "Baseball stadiums were originally built before they had audio systems. So to have music that everyone could hear you needed a loud instrument, and that is what an organ was. Even when they added sound systems it was still higher quality and less expensive to use an organ. It has now been used for so long that it i...
How are new elements discovered/created?	[ "They take two smaller atoms and smash them together. If they can do it with just enough force and hit it in just the right way, then the two atoms will overcome the electromagnetic force, and the strong nuclear force will takeover, and bind all the protons and neutrons into a new nucleus. So if you take a titani...
Why is salt added to boiling vegetables?	[ "I'm pretty sure salt is added to boiling vegetables just for flavour rather than for some reason like this. If you boil something it is going to lose flavour into the water (you'd be making very weak stock technically) so perhaps it's to improve the flavour a bit to counteract that. That's why I add salt to boil...
Why do some webites hide the price until you add it to the cart?	[ "Manufacturers can enforce something called a \"minimum advertised price\" on their products through contracts with retailers. Basically, the retailers have to sign a contract that says they can't advertise the product below a certain price. Manufacturer's do this to ensure that their products sell at a certain pri...
If an identical twin commits a murder, how does DNA evidence prove which of the twins it would be?	[ "It doesn't. But they don't have identical fingerprints, which can sometimes be used to differentiate which twin was at the scene. And there's other kinds of evidence that can be used. For example, if I had a twin who committed a murder in Fort Worth at 3PM and our DNA is there, but I have multiple witnesses and se...
When I sleep in the sun, why is my vision blue when I wake up?	[ "It's because you've been looking at red -- or at least your eyes have -- while you've been asleep. \n\nIf you close your eyes on a sunny day, some sunlight is still getting through the lids, and it's tinted red because that's the color that makes it through.\n\nBecause your eyes have been flooded with red light wh...
Why is there all this focus on advanced encryption/decryption technology but we still can't decypher some older things like the zodiac cypher?	[ "It's possible that the zodiac cipher is some form of one-time pad cipher, which is mathematically unbreakable. It's a cipher that has its uses, but is usually less practical than modern asymmetrical key ciphers that are still insanely difficult to break but easier to properly implement.", "It is possible that it...
How do Fighter Jets, packed tightly in a hangar, move without damaging one another?	[ "IIRC from when I was in the Navy, you need 5 people to move an aircraft. 1 to drive, 1 to walk at the nose, 1 at the tail, and 1 on each wing. \n\nHere’s a little video of moving an aircraft at night from the flight deck to the hanger deck of an aircraft carrier. _URL_0_", "They pull them with little tugs, and d...
When you have to pee, why does the sound of running water make you have to pee more?	[ "Unscientific answer? Pavlov.\n\nYou associate a stimulus with an action, so when you receive that stimulus, you act.\n\nLike you're 5....\n\nLets say you have a puppy. Every time you give the puppy a treat, you get a chair and pull it over to the cabinet so you can get the treats down from the shelf. When you give...
what's happening to egg whites when they whip from running to fluffy?	[ "Think of whipping up a sink of soapy water. The foam forms because of bubbles of air being trapped by the enhanced surface tension. Egg Whites are just like that but their surface tension is even higher allowing even smaller bubbles to be locked in. If you were to view the results under magnification you would see...
How does re/CAPTCHA guard against robots?	[ "Bad guys that are hacking a website use a bot to scan websites and attempt \"brute force\" attacks, by trying infinite numbers of usernames/passwords sequentially or denial of service attacks that try to repeatedly submit a request to the website using a website's web form. \n\nNormally, a bot will scan the text ...
Why do we get nauseated when we see others hurl?	[ "It's because humans originated as groups of individuals who often ate together. If someone vomited because of bad food, it was better in the long run for other people to vomit too, just in case they had eaten the same food.", "Let's treat this as an actually ELI5. \n\nWhen your brain sees someone else get hurt, ...
How is it that I've been writing for almost my entire life, yet my handwriting has barely improved since I was a child?	[ "Because you haven't practiced improving it. You've just been doing it the same way. I know people who have played golf for 40 years, they still suck at it. Because they just play. \nYou _could_ improve your penmanship, but your would have to practice enough so that your muscle memory would use your new improv...
What is an OpenPGP Public Key?	[ "Some forms of encryption, like PGP, use asymmetric keys. That is, for any person participating in messaging, there are two keys. You can use either to encrypt the message, and the recipient uses the other to decrypt it.\n\nThe two keys are called public and private. The private key is secret; only you know it and ...
How do directors and writers who are known to be bad and universally disliked by almost everyone still get to make movies	[ "Generally, that is true. If you're talking about Uwe Boll in particular, its because there used to be a tax loophole in Germany where you could write off movie losses (and all of his movies have been financial losses)\n\n > Until the law was changed in 2005, Boll was able to acquire funding for his movies thanks t...
How do new words, names and things - such as fidget spinners, trunkie, ISIS, get made into sign language?	[ "Very slowly, generally someone will spell it out, and after spelling it a couple times, make a new sign indicating what it is. \n\nIE: my deaf friend does a \"fidget spinner\" by holding her thumb and index finger together with one hand and drawing the index finger of her other hand down in front of this. \n\nEven...
When my character in a first-person video game falls from a large height, I get the sensation of falling in real life.	[ "You rely significantly on vision to inform your brain about where you are, and your relationship to your environment (whether you're moving, for example).\n\nThis is why you may feel the sensation of moving backwards if you're parked next to a large vehicle and it begins to pull away. If it fills your field of vie...
Why does salt cause corrosion on hard surfaces such as concrete?	[ "Salt lowers the freezing point of water and will allow liquid brine to fill tiny cracks in the material. Then as it becomes diluted the freezing temperature rises and the water will freeze, forcing the cracks open. Over time this will break down the surface of the material." ]
Living vicariously through someone else	[ "I am assuming that you are asking about what the phrase means, rather than how to do it. Living vicariously through someone else means taking someone else's experiences as your own. An example of this is the situation where you wished you could travel to another country but can't. If your friend goes traveling and...
Why do some internet services make it impossible to actually delete an account? What do they gain by holding on to an empty profile?	[ "Just piggybacking on /u/ameoba 's answer, deletion is what's called an 'expensive' database action, especially depending on your underlying database software. Think of what has to happen to delete an account. \n\nFirstly, remember that especially with user accounts, you almost always want the data to be clustered...
Why does it seem Democrats support higher taxes, but Republicans support lower taxes?	[ "That's a fundamental difference between fiscal left (Democrats) and right (Republicans, Libertarians). Left = bigger government, more regulation, more services, more taxes required. Right = lower taxes, lower regulation, requiring smaller government and fewer services.", "There are two classes of thought behind ...
[Biology] What happens to our bodies when we "warm up" before working out?	[ "Gets your heart pumping harder and dilates your blood vessels, which gives your muscles a fresh supply of oxygen. This increases their effectiveness, delays lactic acid buildup, makes your muscles more limber, and makes it less likely you will pass out." ]
how does photons work?	[ "While this requires a lot of explanation, it's a bit of a long story.\n\nPhotons are basically a particle which is massless, which means it has no mass, hence why it can travel as fast as it can.\n\nHowever, that doesn't mean we can't interact with it. The problem is that photons are always moving. Fast. Really fa...
Why do I seem to enjoy my music more when it's louder?	[ "Increasing the volume removes the background noise, so the only thing you hear is the music. Nothing to distract your enjoyment and no sounds from your surrounding add to your music.", "My guess, alongside with what others have stated, is that your brain will concentrate more on the louder music. Your brain dev...
How does film finance work?	[ "Sort of like investing in a start up. Agents and marketers present a desirable package of talent: writer, actors, directors to the studios. Who then secure funding via their own accounts or by getting loans from banks. (Corporate banks run everything) Then, the studio hires a production company or makes the film i...
What happens if the child of a US president wants to hang out with their friends?	[ "[There won’t be a hand held, a first kiss or a high school dance that the Secret Service won’t attend](_URL_0_).", "They hang out with their friends. They're just protected by secret service. I'd go to parties at Yale under Bush and Barbara would go out like any other college student. Detail would follow, stay o...
Why is it that when you turn on a heater and suck in the air coming out of it, it feels dry?	[ "Hot air has a higher capacity for water. So if you heat up a volume of air the relative humidity goes down even though the absolute amount of water stays the same. Therefore the warm air can take up more moisture and that can come from your skin and other tissues, so you feel that it's drying you.", "Hot air ...
Will wearing prescription glasses cause your vision to deteriorate more quickly than without them?	[ "That's what my ophthalmologist told me would happen. And indeed it did deteriorate very quickly after the first pair of glasses. But really, what are your options? Wear glasses and have your eyesight deteriorate and slowly stabilize at a degree of short-sightedness (or long-sightedness, etc.), or not do anything a...
Who's clashing with whom in Egypt, what are the biggest issues, and how bad is it likely to be?	[ "Many will disagree, but IMO the elite (urban, educated, 'liberal', less dogmatically religious, etc) thought they could do better than Mubarak. They are demonstrably wrong.\n\nThe Muslim Brotherhood (and other similar groups), have been working for nearly a century against more secular rule, and effectively repres...
How come cats and dogs don't pet each other?	[ "My cats \"pet\" each other all the time. They are always licking each other. It's not as if they have hands that are suited for petting. \nWhile they might only do it to keep each other clean, it sure seems as if they are showing affection sometimes. \nAnd when I'm petting them, they'll lick me back, even though I...
When I'm sleepy and go to bed, suddenly I feel awake and unable to go to sleep.	[ "1. You began probably sitting on a couch or at your computer. In either case, you've been on for awhile... let's face it... it's reddit. The point is that it's getting late & you've been lazy. Of course you're tired.\n\n2. Bed time, you resolve! But now you're up, moving around. Fiddling with a remote, closing/s...
Why did the Equal Pay Act fail?	[ "I think you mean the Paycheck Fairness Act. That's the bill in congress now. The Equal Pay Act was passed successfully in 1963.\n\nOpponents of the Paycheck Fairness Act point out that the premise behind it (women's mean income of 77% of that of mens) is flawed because it doesn't account for *actually performing...
why do household electronic appliance settings go OFF, HI, LO?	[ "There are two cases for this, one using electronic devices, and one using gas powered (like a BBQ or gas stove), and they both share the same reason as to why it's beneficial to start with \"high\" in some cases.\n\nYou can do a home experiment with a dimmer switch and incandescent light bulb that will explain it....
Are welfare services a state responsibility?	[ "I would give 2 reasons:\n\n1) people who are desperate and not provisioned for end up going into a life of crime and banditry. Of course, the alternative is starving to death and they don't have anything to lose now. This is bad for society as a whole.\n\n2) all welfare spent helps grow the economy. Since welfa...
Does the immune system only protect against foreign agents like virus or bacteria, or is it also beneficial to fight diseases such as cancer, diabetes, high blood pressure etc.?	[ "Yes. You are developing potentially cancerous cells all the time and your immune system is destroying them all the time, too. Cancer cells are your own cells, mutated, and your immune system usually recognizes them as diseased and kills them off. Developing cancer can sometimes be worsened by a weakened immune sys...
Why are human babies so much louder and attention grabbing compared to other animals? You would think it would be a bad survival trait for the young of any species to have.	[ "I have raised baby birds. They \"cry\" a lot like human babies, and will beg and mob their parents for food. In this case, it's advantageous because the best beggars get the most food.\n\nI'd honestly rate baby bird crying as worse than human.", "Human babies are much more dependent on their parents than anima...
Why do lawyers cost so much money?	[ "They are in high demand because what they do is a matter of life and death. They typically have more than one person on payroll besides themselves...office staff, paralegals, etc. So you're not just paying for one person to pay your bills. Lab testing and expert testimony cost money. So you may have four or fiv...
Why is the basic unit in angular measurement the right angle?	[ "The \"basic unit\" in angular measurement is either the degree or the radian. It is not \"the right angle.\" A right angle is just an angle that has certain special properties (or conveys special properties on shapes that contain it)." ]
What is that we see as happiness/love/desire/sadness/depression in someone else’s eyes? Has then something physically changed in person’s eyeballs or how are those feelings manifested that make us to perceive them so effortlessly?	[ "It's the combination of eyelids, cheeks, and eyebrows. Those three areas of the face are all very close together, and very slight differences in angle and tension can communicate a wealth of information about what the person is thinking/feeling. Cycle through a few emotions and feel how your eyelids shift, how y...
Why are so many electronic services (e.g., Uber, Imgur, Steam, etc.) updating their terms of service? Are they required, or is it better for the companies to do so?	[ "Because of GDPR (General Data Protection Regulations) set up by the EU taking effect today. This regulation requires more transparency from the company about what data they collect from you, how, why and what is used, and more control to you about what you want and don't want to share online." ]
What causes the noise a flame makes when blowing in the wind?	[ "When something burns it isn't actually the solid or liquid that burns. It first off gases or evaporates creating a gas that is flammable. This gas however is too rich to burn immediately it rises and mixes with air until it makes a mix that can burn. If you look at a log for example you will see a very small space...
Why is it harder for women to lose weight than it is men.	[ "Men have a higher basal metabolism, we're taller and have more muscles. In addition men look like they're gaining and losing weight faster since most of our fat is on the belly while women have it spread out on some plump and nice places as well." ]
- how do chameleons change their colors?	[ "Firstly, i just want to say that it's a common misconception that they do this to camouflage themselves against a background. In fact, chameleons mostly change color to regulate their temperatures or to signal their intentions to other chameleons.\n\nNow to the actual ELI5:\nThe outermost layer of a chameleons ski...
Why does tan/sunburnt skin appear lighter briefly after pressing down on it?	[ "The skin is red due to increased blood flow near the surface. By pressing down on the skin you force blood out of the thin capillaries, similar to squeezing a sponge. In doing so you reduce the visible blood and change the color." ]
Why does it require more energy to not care what people think vs caring?	[ "This one really depends on what kind of person you are in the first place. For example, I find it much more draining to care what people think than I do to just ignore them.\nIt's likely that you're just an empathetic person, meaning you are prone to caring about others and about other's perceptions of you. There ...
a Library in computer terms	[ "Libraries are various pieces of code someone else has already written. They leave an API to allow others to interface with that code. This allows programmers to focus on their task so they don't have to re-implement the same algorithms someone else has made over and over. Also, it allows access to parts of code th...
since radioactive materials shoot off particles, how come we have a constant supply of radioactive material? or do we not and we're just running out?	[ "That is correct. That is why Nuclear energy is not considered renewable. The thing is many of those materials decay so slowly that it makes little difference. Also, you have to understand half life. Radioactive materials have what are called half-life. This is how long it takes for half of a certain radioisotope t...
why the turn signals of 2 cars will always sync at one point.	[ "Those metronomes are on a shifting table, that's why they sync up.\n\nFor cars, I can give you math to show why they might sync up, and why they may never sync up.\n\nFor simplicity, say car A blinks every 2s, and car B blinks every 3s. 2 * 3 = 6, so they will converge at 6s. Now cars blink in the decimal places...
Why was Half Life 3 never created/released?	[ "According to numerous interviews with Valve over the years, the company has a very \"flat\" structure. \n\nIn most companies, you have employees reporting to a manager, a manager reporting to a director, a director reporting to a VP, a VP reporting to a C-level executive, the C-level execs reporting to a presiden...
How to play League of Legends	[ "(prepare yourself for a very long post)\n\nLets begin with what category of video game League of Legends (I will call it LoL for times sake) is in. It is a multiplayer player versus player game, which takes place in an arena. There are two main arenas, one which is where 5 people face 5 people, and another which i...
How was the first language ever invented?	[ "That's a trickier question than you might realize. For one thing, you have to define what you mean by language. \n\nIf you mean \"how did we first manage to communicate with one another\" that's easy. Just go out and look at any random animal that is moderately social. They communicate through body language, growl...
Why is symmetry so prevalent in nature and animals etc?	[ "Why store two completely separate sets of instructions when you can just build the same body part backwards?\n\nFor complex animals it also helps with balance and locomotion by keeping their center of mass actually centered." ]
Why are carbonated drinks so satisfying, especially when you are really thirsty?	[ "I used to buy simple carbonated water by the case. Then I bought a seltzer bottle (the kind that takes little CO2 cartridges). Now I have a Soda Stream. I adore carbonated water. Really cold carbonated water satisfies my thirst like nothing else. I think it's because the bubbles sort of 'sting' the back of my pala...
Ergodic Hypothesis	[ "Not sure if I can answer this in an ELI5 way, but I'll try. The way I like to think about it is as a trade-off between time and space. If you can start your system at any random spot in space and then let it run, how it evolves through time also looks random. \n\nLet's say you put an ant on a table and let it w...
How time travel could possibly work?	[ "When you get closer to the speed of light time passes faster for you but for everybody not traveling that fast it would not. You could go on a journey 1 lightyear away at the speed of light and come back to find it nothing like you had left it.", "Time travels slower the faster you go. Time also slows down the ...
Why do modern soldiers never have armor over their faces?	[ "Mobility and vision is more important. Armor reduces both." ]
Why are planets/moons/stars perfectly round?	[ "Quite simply: gravity.\n\nOnce you get above a certain size, gravity is strong enough that it will even deform an object into a sphere, which minimizes the gravitational potential energy on the object (everything is as close to the center as it can be). \n\nIt isn't perfectly round though. Mountains an valleys pro...
Why is the CDC not allowed to research gun control/gun violence?	[ "They say it's because they believe that CDC should be limited to studying diseases and gun violence isn't a disease. However, they also believe that the results of the study will be used to support more stringent gun control laws, which is probably closer to the real reason.", "Since Congress passed the law that...
Why do (generally) quiet things seem to sound louder at night?	[ "Mostly due to less background noise. Your apartment/house is most likely quieter at midnight compared to an office environment or daily activities surrounding you. There's likely less activity going on at midnight, less cars going by, less people talking, etc.\n\nFor example, if you're in an office during the day,...
Why are stuffed animals so comforting, especially for children?	[ "Children are inherently social, so they will instinctively seek out things with facial features: eyes, ears, mouths, noses. The feeling of not being alone is calming, especially for infants and toddlers. \n\nFuzzy and furry things are warm, which also provides a sense of comfort and being in a group. Cuddle up w...
What are ultraviolet photographs? How do they "convert" the ultraviolet to seeable wavelengths?	[ "Ultraviolet photographs are photographs that have recorded only ultraviolet light.\n\nAs for how ultraviolet is 'converted' so we can see it, it doesn't really work like that.\n\nPhotography works by using a chemical (or digital sensor) that reacts when light hits it.\n\nFor example, black and white film photograp...
How are Sitcoms that are taped in front of a live audience taped? How long does it take?	[ "It will vary from show to show, so I will stick to answering specifically for Seinfeld.\n\nIt was generally filmed in chronological order, but anything filmed off site was filmed in advance and shown to the audience on screens to get the 'laugh track'. Although if they didn't like the audience laugh they would sti...
Why doesn't someone start a blood factory? Instead of blood donation, blood jobs!	[ "1. Because you are basically making them commit to something that's really invasive for life. If you're looking for someone with the perfect blood, you need them to live their entire lives according to rules prescribed by a specialist. You basically tell them to sign away their right to choice for money. That's a ...
Why does depression cause loss of appetite in some, while being blamed for overeating in others?	[ "There isn't just one chemical or even just one set of chemicals that causes depression. If there were, depression would be very easy to treat. Every depression is different, because it's just a symptom of various things going wrong in a person's brain.", "Depressed? I will eat. Something freshly miserable for me...
Why do I need to drink water more often than eat food?	[ "We use water for all sorts of things in our body, food is pretty simple, broken down and used or stored. food can be stored in different forms, water cannot be stored as easily. so we have to replenish more often because we cant store it as easily." ]
How Does A Person "Just" Die?	[ "I'm a nurse. I've worked in a nursing home, and currently work in a hospital. I've seen this happen many times, so I'll give it a shot. \n\nYour body is a bunch of interconnected systems. They depend upon each other so they can function, not unlike [this](_URL_0_). As you get older, your systems accumulate da...
Do we need energy to hear, or smell? Or is it just a physical reaction? If not, could we be so exhausted that we can't hear?	[ "Sound waves are turned into pressure waves in the inner ear mechanically. The fluid waves in the inner ear move little \"hairs\" mechanically. Cells sense that motion and generate electrical impulses, that takes energy from food. The electrical impulses trigger neurons in the brain, all powered by food. Neurons...
How is colour added to photos dating from before the time of coloured photos?	[ "Very talented Photoshop users.\n\nThere is no color in black and white, so you have to add it yourself.", "Adding colours like paint. There is no way to revive the original colour because there WAS no original colour, the film was only black and white. \n\nMany of the colours in re-touched photos are completely ...
When someone has extreme sleep deprivation, why do they get hallucinations?	[ "By normal function of your cells, your body will accumulate waste products and chemicals which disrupt normal bodily functions.\n\nYour body has evolved hundreds of thousands, if not millions, of chemical reactions to deal with these waste products. Some of them are seriously complicated, involving multiple sequen...
The Losing Door in the Monty Hall Problem	[ "Let's look at the problem a completely different way. But first I want to point out something that I will explain fully at the end. The Monty Hall problem only happens because Monty Hall knows what is behind each door. If Monte Hall opened a random doom, this seemingly odd math problem would not happen. It o...
What's counter torque and why is it needed to make a helicopter fly?	[ "A helicopter flies by using an engine to spin a primary rotor, but that rotor has inertia so when trying to spin it there is a force pushing back that tries to spin the helicopter body too.\n\nCounter torque is provided by the tail rotor and ensures that only the main rotor rotates around the shaft and the body of...
Why does salt water help heal wounds?	[ "It acts as a mild antibacterial (bacteriostat), allowing your body to focus on repair rather than disinfection.\n\nCells, including bacteria, cannot manually control their hydration, they depend on the diffusion of water through their membranes (osmosis). The high salt concentration in the salt water draws out...
Why is the shadow of my lenses black?	[ "A lense changes the direction of (refracts) light.\n\n\nA convex lense () refracts light so that it gets closer together afterwards. You would use a convex lense to light a fire from sunlight.\n\nThis is used in glasses where the lense in the human eye cannot contract enough to focus the light effectively onto the...
Why can't Solar Panels be at a 0° (Parallel to the ground) Instead of at an Angle?	[ "The sun is never directly overhead north or south of the tropics, so it'll be less efficient. Panels in North America and Europe should tilt south to get the best exposure angle.\n\nThere's also the issue of dirt and debris collecting on a flat surface.", "It's about increasing surface area, that is directly ex...
How can loans from small credit unions have much lower interest rates than loans from large international banks?	[ "Credit unions typically don't make a large profit and, for several reasons, they typically have lower operating costs/payroll. Because of this, they can give out lower rates and make less money.", "International banks report to shareholders who demand certain returns (in line with their appetite for risk). Conse...
what would happen during a nuclear winter?	[ "First of all, you should know that nuclear winter is not settled science. The thought is that bombs that detonated over cities would cause a firestorm in that city which would lead to a huge amount of soot and ash being sent up into the atmosphere. That soot & ash would partially block sunlight and dramaticall...
how is hacking into driverless cars going to be prevented?	[ "The easiest way to prevent hacking is to secure any access point into the car's information systems. There's three channels through which you could try and hack it - communicate to it wirelessly, communicate to it on a wired connection like a USB port, or physically install or change some components. \n\nIf your c...
Why is it that every time I buy solar landscape lights they only work for a couple of months (even with cleaning the solar panels)?	[ "It's probably not a problem with the solar panels. Many have internal batteries to store the energy from the day and deliver it at night. After many charge/discharge cycles and temperature extremes of hot and cold, the batteries aren't as good anymore. And the batteries they include probably aren't the best. A...
Why are roses so expensive.	[ "The same reason diamonds are: perceived significance or value. Diamonds aren't actually worth much; they're just supercompressed carbon that happens to occur naturally under certain circumstances. People just think they're rare and valuable when they're natural, and cheap when they're man-made, despite being struc...
What is a snap election, and why doesn't it exist in the US?	[ "Often times in parliamentary systems of government the prime minister or other head of government must have elections every set number of years, just like in the US system, but they also allow for them to call for elections at a time of their choosing prior to the normal time between elections. This is very usefu...
How does running improve your oxygen uptake capacity?	[ "Physiologist here, some answers are correct some BS.\n\nTo understand how your cardiorespiratory fitness, or maximum oxygen uptake (VO2), increases after a period of running you have to know what this terms actually means. The VO2max is the maximum volume of oxgygen that is used by the body measured during increme...
Why do we still use USB and not fibre optic for file transfer. My Soundbar uses fibre optic, so it can't be a cost issue.	[ "USB is\n\n* cheaper (both cables and controllers)\n\n* bidirectional by default (SP/DIF is unidirectional because it is only 1 fibre cable)\n\n* can carry multiple signals at the same time (again, your SP/DIF only carries one. Alternative is multiple fibers, or multiple colours per fibre, but that second one incre...
Why is a beautiful view beautiful?	[ "Answer: Much has been written on the subject of esthetics, it's a major branch of philosophy. One good avenue of inquiry is to check our different ideals and attitudes across culture lines, look for universals. Likely a very subjective item.", "Crazy! I just asked pretty much the same question and then saw t...
Why do we need economic growth and why is it considered bad if an economy does not grow?	[ "Think of it in terms of loaning money to a friend. If your friend is about to start a great new job, you'll happily loan them money. But if your friend is about to lose their job, you'll be much more hesitant because you're worried they won't be able to pay the loan back.\n\nWhen taken across an economy, this me...
How do all those one-way-rental trucks (U-Haul etc) get back to where they came from?	[ "In NZ we get a lot of tourists driving campers from Auckland and flying out of Christchurch. They pay people to drive them back. They generally get paid to drive to Picton and board them on a boat then get bussed back (get about $70 for it). They are picked up in Wellington by another mob who drive them to Aucklan...
I assume Turkey's attack on the Syrian government is in violation of international law, if so does that negate our nato obligations when syria, iran, or russia strikes back?	[ "Wait so Turkey are attacking both Assad's regime and the Kurdish rebels? What the hell is their game? \n\n_URL_0_", "I love this question. It's basically, \"Explain like I'm 5: international politics and treaty law." ]
What is the difference between [i.e. Their roles and responsibilities] (in countries that have both) a president and prime minister?	[ "The Prime Minister runs the country. The President is a more ceremonial role. This is grossly oversimplified, and it may vary from country to country, but in general that sums it up.", "The Prime Minister heads the government. The government is made up of the legislators whose party wins the most seats or a coa...
if the NSA can reach 75% of the internet, then what about the deep web and the crimes that go on there?	[ "First: The NSA may see that someone is asking for (for example) child pornography but they don't see who is asking. For example because they use TOR.\n\nSecond: The amount of data the NSA has is so big, that it's simply not worth to investigate every single small crime. They probably only look for terrorism and ...

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