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What kind of chemistry is happening at my neighborhood pool when everyone's sunscreen, cosmetics, pharmaceuticals and body fluids mix with the chlorinated pool water? | Not sure what pharmaceuticals you're talking about. Does each person just drop their Xanax and Aspirin into the pool to make it a real party? Pharmaceuticals don't really "leak" through your skin, so I'm not sure what pharmaceuticals are getting into the pool. Either way, there aren't any chemical reactions occuring be... |
Why is it that in games like GTA you can destroy signs, poles, etc but not trees? | Signs/poles etc. can be shown to snap cleanly in half. If a tree did that without splintering and such, it would look terrible |
Why do tobacco companies put so much crap in their cigarettes? | Dude. They don't put that shit in, that shit is naturally occuring byproducts of combustion of organic material. That graphic is making the point that these byproducts are also found in 'scary' things you wouldn't want to eat. It's anti-smoking propaganda. Note: I am an ex-smoker and think that smoking is terrible for ... |
At what point does a war become a World War and who is in charge of declaring it that title? | The First World War was known as The Great War as it was the war to end all wars. However after another great war erupted just a few decades later that were even bigger the name did not stick. Since the second war were a combination of many different wars all over the world calling them World War One and World War Two ... |
Why is the price of diesel not going down as much as gas? | In this country we ship and transport goods. The trucks have to keep rolling to support our infrastructure. The gas companies know this! You should ask why it is more. Diesel is a byproduct of the process of gasoline |
META: Can we get an answered flair so that people stop wasting their time explaining something you know well because it is a simple concept that 1 person explained and it was enough, please? | **Please read this entire message** --- Your submission has been removed for the following reason: This is not a question. This should probably be posted in /r/IdeasForELI5. Anyway: in the past we had such a flair, but we decided to get rid of it and replace it with our current system, where things were flaired by cate... |
How did Russia become the host for the Olympics? | Every two years, cities around the world make bids to the International Olympic Commission to host the Olympic Games. Originally most Olympics games, especially the Winter Olympics, were selected on the strength of being a popular place for winter sports like a ski resort. Today, cities are selected through a much more... |
Why that guy kneeling during the national anthem in a crowd, is getting so much attention on Reddit? | People who don’t understand that the very thing that makes this country great *is* the right to non-violently protest believe that he is disrespecting the flag/country/military by kneeling. They don’t realize that they are disrespecting the military, and all those who have died protecting our freedoms, by trying to tak... |
Why it's legal to be drunk in a bar, legal to be drunk at your home, but illegal to be drunk anywhere inbetween. | Public Drunkiness. Your home is private property, the bar is private property, and in between is public. Since you're not allowed to be drunk in public, you can't be drunk on the streets. But since the bar isn't public property, you can be drunk there all you want with the owner's permission. |
If Hollywood is so accepting of homosexuality, why are some actors still in the closet? | The industry is, but not the fans and the rest of the public.It's not so much got to do with public reception or movies tanking as their casting options, many gay and especially lesbian actors, feel that that if they come out it will effect the kind of roles they are offered.Some actors are afraid that their roles will... |
How does a bank fail? | By owing money to people that it doesn't have, which is a constant risk when it comes to fractional reserve lending. That being said this can happen anyway even without loaning more money than you have - if I run a bank and have 1000 deposits of $1000, and I loan out $100,000 to a business for a year, and then two week... |
If testicles are so vital and important to reproduction, why are they so sensitive? | To alert you quickly that they are possibly being hurt and need to be protected better at that time.You just answered your question there. They're sensitive *because* of how vital they are. If they weren't sensitive, we wouldn't nearly be as encouraged to protect them |
What kind of "filler" is in tobacco? | In cigarettes it can be anything from sawdust to paper. In cigars, filler is refers to as the parts of the leaf that provide combustion when lighting. |
How do firefighters combat skyscraper or high-rise fires? | It a has to do with a couple of things. Water access and fire apparatus. On the water access side, a lot of buildings have plugs for fire hoses attached to the walls that the fire department can hook their hose to. This cuts down on amount of hose used when fighting large structural fires. You see them all the time in ... |
Why do waiters pour water out of the side of the pitcher rather than the front, where it's supposed to be poured out of? | The spout on most pitchers has a lip on it to stop ice from flowing out . If they want to put more ice in your cup while adding water they'll pour from the side so ice falls out too", 'Because if you do it the other way the ice gets in the way and it makes it a mess/pain in the ass to pour -source am waitressI used to ... |
Why do you feel run down during a cold? | Fighting a cold literally takes a lot of energy, and if it's more than what you're used to using then you feel tired and sleepy. There's a lot going on when you get sick, and the best thing you can do is keep warm so your body doesn't have to spend quite so much to keep you warm while fighting off whatever made you sic... |
What causes the sensation of throbbing pain? | The existing answer is completely wrong. Throbbing pain is caused by a class of nerves called c-fibers, that react to damage signals from your tissues. It then travels to three known areas of your brain called the anterior cingulate, the insula, and the somatosensory cortex. The "throbbing" is due to: 1. the wide, slow... |
Would a person with more body fat be able to last longer without food then a fit person? | Yes absolutely. The fat is an energy reserve and would enable the fat person to survive starvation for far longer, as long as there was access to water. Assuming their diets before the starvation started i.e. none of them had any severe nutritional deficiencies the difference in energy reserve would make a big differen... |
Why does a fan look faster when seen as a whole, but when you focus on one blade it slows down significantly? | I know exactly what you are talking about. If you focus your sight on the center/motor area the blades move fast. If you focus on the outer edge of the blade you can track it. To answer the question it has to do with your reference point. If you look at the center of the fan, the center of the the fan doesn't move. So ... |
How is destroying Ivory not destructive to Elephants? | The idea is to destroy the market, so you don't want to allow any ivory to enter it under any circumstances. A similar thing is done with the feathers of endangered birds - even if you find one on the ground that was shed naturally, you are not allowed to keep it, because it confuses and dilutes the government's abilit... |
How do Japan and the USA have such good relations considering the nuclear bombings of Hiroshima and Nagasaki and the Japanese American Internment? | You have to keep in mind that 230k was barely a blip on the radar as far as WWII went. Everyone lost huge numbers of people. For the States, we were too busy with postwar Russia to go about being salty about the war with Japan. For Japan, frankly, it was too busy rebuilding to worry about acting belligerent with a nati... |
Why videos don't load continuously, smooth way and load in small 'jumps' | Imagine you're at a buffet selling only m & ms with only one guy handing the candy out to people. some people will go up to the man with an empty bucket and ask for m & ms, instead of filling everyone's bucket to the top he will put in only a big handful, topping them up as they need. this is useful in many ways. Some ... |
Why has USA not endorsed the UN Child's Rights Convention? | From wiki: > The United States government played an active role in the drafting of the Convention and signed it on 16 February 1995, but has not ratified it. The Convention is unlikely to be ratified in the near future because it forbids both the death penalty and life imprisonment for children even though a state can ... |
How do doctors estimate the remaining lifetime of a patient? | Yeah, it's a combination of the stats from similar cases, the age and health of the patient, how advanced the disease is, etc. So it's not perfectly accurate, but it's a good estimate to start basing decisions off of. |
Why can't you forget how to ride a bike, but if you can forget a learned language if you stop using it? | Probably due to muscle memory. Most people will forget names and phrases but you won't really forget how to walk", 'Even if you "forget" a language, you can relearn it in a fraction of the time it took to learn it originallyYou can forget how to ride a bike.I'm practically fluent in 5 languages, and have never forgotte... |
if the fictional cities in the Grand Theft Auto video game franchise so obviously represent real cities, why can't they call them by what they are? | If you call the city by a real city name people will complain if it isn't perfect. If you make a city like a real city but call it something else you have complete artistic license. |
What is a Java Servlet and what is an example of one. | A servlet is something that accepts web requests and provides a response for it. When you click on a link, typically your browser identifies the server the link leads to, then makes a request to this server indicating this URL and maybe an attached form. The server receives this request, then figures out what it should... |
Can someone explain why we have strict liability in law? | The reason for this is many crimes do not require you to intend to do something illegal, or have motive. For example the prosecution does not need to prove a drunk driver intended to drive drunk, only that he did in fact drive drunk. This idea of strict liability is usually only applied to minor violations, like parkin... |
Why do radios have such bad audio but phones often have perfect audio | radio uses analog transmissions which doesn't allow error correction or detection. Transmission errors will affect the signal. Mobiles use digital transmission with high data rates. And even if a transmission error occurs you can figure out which bit is faulty and correct it. You can correct digital signals because the... |
Do car headlights move faster than the speed of light? | Nope, photons travel at the speed of light for whatever medium they're traveling through . Even if your car was somehow doing 99.999% of the speed of light the photons would still be moving at *c*.No, the headlights will always travel at speed of light because speed of light is constant. So, in order to compensate, the... |
How Computers or phones play sound | digital sound is encoded by translating the acoustic wave form into a sequence of discrete instants of sound. consider a song that is five minutes in length. lets break up this 5 minute long continuous wave form of sound by sampling it 5 million times, with each sample evenly spaced in time. thats alot of samples, so e... |
What is the purpose of finger/toe nails? | From what I have read they are essentially remnants of claws. As humans started to use tools our hands evolved flatter, wider fingers and this caused our finger/toe nails to flatten and widen as well.Nails are human claws. We use them for digging and climbing. Now that most people don't do those things, our nails don't... |
Why can't we take historic pictures of the Earth? | > Anyway, would it be possible to send a small object/camera at a fast rate into space that could zoom far enough to see Earth's past? If you were to head out from earth at the speed of light and spend 100 years travelling at that speed, and then you turned around and snapped a picture of earth, you'd see earth . exact... |
Why is it when a person forces and mentally prepares him/herself to write something creative the mind is usually blank where as when he/she isnt actually thinking about it the mind is full of creativity? | When you're focusing, you're engaging the parts of your brain that handle step-by-step tasks like math. Creative efforts take specific skills to do, like drawing is a fine motor skill, but to get the ideas for that creative effort you have to use the parts of your brain that handle things like daydreaming. The daydream... |
Why do freelancers/contractors pay more in taxes (USA) | When you work a regular job, you'll notice that certain taxes come out of your paycheck . What you don't see, is that your employer pays half of some of those taxes and you pay the other half. Now, when you're a freelancer or independent contractor, you are your own employer, so you pay both halves of the tax. This is ... |
How does my ISP know they are receiving my signal and not my neighbors? | If you're talking about cable modems, each modem on the network has a unique address, called a MAC address. That's how the cable system refers specifically to you. Data going to your cable modem is broadcast all across the local segment of cable wires, but everyone else ignores it because it's not destined for them. Sa... |
Since we only have one satellite that has left our solar system, how come there are pictures of our galaxy despite it being on such a large scale? | We don't have any pictures of our galaxy from the outside. All such pictures that you see are artists renditions based on what we can see from inside the galaxy, combined with what other, similar galaxies look like. |
Why do animals seem to like stuffed animals (the teddy bear kind, not the taxidermy kind), while people find models similar to people off-putting? | We also like stuffed humans, as long as they're not too human. Dolls, for instance. It's humans that are lifelike, but not quite there, that get you into the uncanny valley. There are a number of theories for why this exists, such as beginning to apply social norms once the object corresponds to our idea of human. Once... |
how do photoshoppers fill in the background of something if there's an obstruction in front of it? | Cloning repeating patterns from neighboring area. Drawing from imagination based on the material. Taking another picture where the background isn't obstructed and copy pasting", 'They carefully "roto" the object in front by hand! High contrast background makes this easier. This is why stuff shot on a green screen can m... |
what gives you the feeling of 'being clean' after showering/taking a bath? | For one thing, you get rid of some smell and possibly replace it with better fragrances. The sweat, oils and dirt are gone. These tend to stick to your clothes so that sense is removed. I think the skin "breaths" better too without the pores being clogged with debris.You can feel the friction and stickyness of oily ski... |
For years they told that the economy was tied to oil then the oil price plummeted and instead of that stimulating economy, economies plummeted. Is there a relation? | Yes, the economy is tied to oil. Many economies rely on the profit and labor associated with the manufacture and sale of oil. While rising oil prices would lead to slight inflation, a sudden drop causes shock and hurts related industry. In the USA, many parts of the central, south, and northeast states rely on the oil ... |
How does medical marijuana/recreational use and sale in states that have legalized that aspect of the trade, work? | Technically, it is all illegal under Federal law, however, the president has stated that for now, they will not enforce the laws in the stateTo add to what others have said, it's a very strange time in Colorado, and most other states. I am a Compliance Officer for a Medical/Recreational Dispensary, so I deal with the l... |
Can someone explain Section 1688 of Title IX in the US Education Amendments of 1972? | It basically says that Title IX is unrelated to abortion. You can't use it to penalize anyone who has had an abortion, you can't use it to force a facility to allow itself to be used for performing abortions, and equally you can't use it to force a facility to not allow itself to be used for performing abortions. |
How do shows on Disney/Nickelodeon get low ratings and views but stay on the air for years but shows on CBS/ABC that get better ratings and views get cancelled after 1 season? | TV shows on CBS and ABC cost way more to produce than the shows in Disney, so they need much higher ratings to justify their continued existence. |
the notion that our physical strength is held within safe limits by pain. Are we really that much stronger than we experience in our daily lives? | To put it simply, yes, your body is capable of lifting much more than you realized. However, it can't do it without serious damage. The stories of mothers on adrenaline lifting cars are true; what they don't tell you, however, is the aftermath, where she has a number of torn muscles and had to lie in bed for a week rec... |
To stop card counting, why don't Casinos shuffle after every round? | That would take a lot of time away from gambling. Some casinos have machines that constantly shuffle so it is a fresh deck every hand.Mostly because it's inefficient and slows down the game. The more hands people play, the more money they lose on average, so the casino wants the games to go as quickly as possible, so t... |
Why do current generation solar panels only operate at ~30% efficiency? What stops us from achieving 100%? | 100% efficiency would basically mean the solar panel is a black hole. Any light that hits it disappears and is entirely converted to electricity. The panel itself wouldn't get hot , it wouldn't get worn or erode or degrade from the sun, it wouldn't reflect any light, etc. |
How do TV networks know how many people watched a show. | For standard and cable tv, a ratings company tracks a volunteer subgroup and tracks what they watch. The results are then used to estimate how many people in total watched the show. |
Why do Ice Sheets melting raise the ocean level globally? Woudln't the mass of the Ice Sheet be replaced by the water melted from it. | You are basically correct, because the ice in your drink is already floating. Arctic ice is floating. If it melts, it will not directly affect sea levels. In fact, sea water levels will rise, but this would be from the expansion of the sea water as it heats, not from the melting of the sea ice per se. The ice in Antarc... |
How to make pictures like the one I provided in the comments. | Basically this .gif is a collection of photos taken at the same time but from slightly different angles. The site owner calls it 'lenticulation', but a more widespread term for this sort of photography is 'bullet time', although this bullet time is on a much smaller scale. Some other terms for this process are 'time sp... |
Why does it feel like some dreams last a really long time while other dreams are really short? | I believe you're describing non-rem dreams vs rem dreams. Non-rem dreams [are repetitive, short, and often representative of your days activities] while REM dreams are longer, continuous, and often very bizarre. |
What stops television lead actors and actresses from demanding ridiculous salaries for the follow up seasons? | Salaries in the entertainment industry are negotiated. The actor's representation asks for this much, the production says they can only afford that much, and then they settle on an amount that nobody's happy with. And don't assume a production company won't replace a lead actor. Valerie Harper made that mistake, and it... |
Why don't I recognize that I'm having a dream no matter how ridiculous my dreams get? | Well, in Inception style While you're dreaming your brain is simultaneously creating your world and perceiving it. In a dream when you're deep into it, and your mind is fully occupied by it it creates what you could subconsciously imagine from your experience and thoughts. Your subconscious convinces you that this worl... |
What is plastic made from? | Plastic is a relatively broad term, but it is used to describe organic polymers, meaning very very very long chains of mostly carbon, generally surrounded by hydrogen. Plastic is made through refinement of petroleum byproducts, meaning it comes from oil. |
Why can we not achieve efficient and relativity low energy flight the same as birds through the design of a similar winged style flying machine? | Short answer is we do! We make gliders in a similar way to large marine birds but: When you say birds wings are efficient they are for a bird is doing but aircraft wings are more efficient for what an aircraft is doing and per kg. Look at an example of probably the best long distance most efficient birds going the Wand... |
why GM foods are bad | If you mean, why do people *think* GM is bad, it's because rather than have a calm discussion about the science, idiots in the media use phrases like "Frankenstein food" and panic ensues. |
Why do the drive tires of a car wear faster than the non drive tires when they turn at the same speed when driving normally? | Because when you accelerate, turn, or brake, you're putting extra wear on the tires doing that work. Having more weight on the tire also wears them out faster. That's why the rear tires of front-engine, front-wheel drive cars wear out the slowest, and why the rear tires of rear-engine, rear-wheel drive tires wear out t... |
why don't subways just cave in? | Imagine you put two bricks 6 feet apart. Then you put some 2x4 across the gap between the bricks. Would that support your weight? What about yours plus mine? How about a baby elephant? Clearly there's a limit to how much weight it can take. But what if you want it to take more weight? You could put to beams side by sid... |
Why do all lighters have a divider in the fluid container? | Just to add structure to the lighter so when you press on it, the plastic doesn't crack and spray lighter fluid all over you. Edit: Another reason might be this:_URL_0_", 'The cross section of the fuel reservoir would not be able to contain the pressure at high ambient temperature without the bit down the middle. You w... |
why is 180°C such a common cooking temperature? | [It's all about the chemical changes involved in baking] -- but that specific temperature has to do with sugar carmelization, but not hot enough to burn, and at that temperature the time it takes for the heat to get through the item you're cooking so the outside doesn't burn while the inside is raw -- although that lin... |
Why do scientists claim they have found the fossils of a "new species" when it could just be a deformed individual of an aleady discovered one? | The chances of a seriously deformed individual surviving long past birth are pretty small. If it's an injury that healed wrong, the bone itself usually looks weird texture wise. It's possible for more mildly deformed individuals to grow up and then become fossilized, but the chances of that are thought to be pretty low... |
What exactly does rabies do and why? | Well for what it does, I'd say [read the wikipedia], it's a pretty good explination. But the short answer is it enters muscle and nerve cells and replicates there, destroying the cells. As for why, well it's a virus, that's how they grow, they use some mechanism to enter a cell, and once inside release stuff that cause... |
Why has the Warsaw Pact dissolved, yet not NATO? | Soldier here. NATO is a very, very different beast than what the Warsaw pact was. NATO was originally set up as an organization of countries who agreed to a defensive pact in the face of growing soviet hostility and the "Iron curtain". The basic premise was thus. An attack on any one country that was part of the allian... |
I heard today that only 5 countries in the world are free of national debt. How are governments able to loan/borrow/repay debts when every country is also in debt? | Debt does not mean "You have no money" it means you have an agreement to pay some other entity money. The US Government makes money, for instance, from taxes, and they use that money to make the agreed upon payments against their debt. Similarly, if you buy a house, you probably don't pay for it all at once, but make a... |
Why are there many people here in the United States that are so against illegal immigrants? Why do we make the process in which to become a citizen so difficult? | I have no problem with people imigrating to the US. I do have problems with people breaking the established laws. I also feel it is a slap in the face to people that came here legally. |
Why do people start using drugs like Krokodil when they're aware of the terrible side effects? | The high is now, the effects are later. Nothing matters except that high right now. Desomorphine is ten time stronger than morphine and is made from a codeine base which is freely available over the counter in Russia. When heroin becomes expensive or you run out of money ..and it's cheap, can be made at home, and you h... |
Why do url links to even legit sites contain so many redirects to the point that they break the browser? | In my experience, there are three root causes of this plague. 1.) Curators, editors, social media experts, content maintainers, etc that have absolutely no clue about how anything works or the implications of using various tools. URL shorteners are largely a byproduct of twitter culture and its users having a 140 chara... |
How many calories does an average human have in their body, and what happens if they consume every last one of them? | That's a bit of an oddly phrased question because a calorie isn't a physical thing, it's a unit of energy. So you don't really have calories in your body - you have material in your body that is capable of being converted into energy. You have fat stores which are sort of a long term reserve of energy dense material, a... |
How come every song/music piece sounds different/unique to us? | If everything was played via a midi processor then we would have tons of songs that would sound almost identical - a lot of pop music uses the same 3/4/5 chord progression . It's not just about the notes/chords, but the massive variation and interaction available via the modulation of each individual sound. Try singing... |
Why are most humans right handed? | Society has shown a prevalence for right-handedness for more than a million years. Scientists have tried figuring out why, but it's impossible to prove their theories. A BBC study I read on it suggests that it has to do with the fact that the left side of our brain is typically responsible for linguistics, and that the... |
When a small part of an ant pile is kicked, why/how do all the ants in the mound know to go into a frenzy? | The other ants see, hear, and feel the other ants freaking out, and they likewise get excited. The only bit which might not be apparent is that they also smell each other's mood. Panic an ant and it will release pheromones which other ants smell and know that, say, the nest is under attack and it's go time. So yeah, th... |
What does a Movie's CGI cost mean ? | It's not just a single artist for any movie that includes CGI - it's dozens of them, even hundreds for a big-budget movie with lots of CG effects. Entire companies full of digital artists are contracted out to work on these movies, because it takes an incredible amount of work to make good-looking CG. So those millions... |
. Why do most humans find spiders so creepy? | The obvious explanation is that people have obtained a fear of spiders due to the fact that we consider their bite poisonous. According to [Wikipedia]: > An evolutionary reason for the phobias, such as arachnophobia , claustrophobia, fear of snakes or mice, etc. remains unresolved. One view, especially held in evolutio... |
How do game designers create the logic or on what do they base the logic in sport video games to the deliver the correct commentary in the corresponding situation, e.g. football (soccer)? | My partner is a game dev so from what I've learnt from him: The dev will create a sequence of scenarios and imput them as codes with a yes or no answer to branch off from. for example in a soccer game I would assume it would be something along the lines of; does ball reach goal? If yes trigger audio 1. If no trigger au... |
How can all planets in Solar system perfectly orbit around the Sun even though their distances from the Sun differ? | > But, why doesn't Mercury just crash into the sun and why doesn't Pluto just "escape" the Solar systems with it being so far away? Because the planets are all moving sideways, which causes them to fall toward the sun, but always miss. That's really all an orbit is. It's actually quite difficult to get an object to col... |
if I were to donate a kidney or lung how would they decide which one to take(left or right) | With kidneys, if they are equally healthy, they usually take the left one because it has longer blood vessels. |
How do they decide which actors get the "with" or "and" in TV credits? | It's something that is worked out and agreed upon during contract negotiations. Hey Jon Hamm, how do you want your name displayed in the credits? "With Jon Hamm"? "And Jon Hamm"? "Featuring Jon Hamm"? "Jon Hamm as Don Draper"? "Introducing Jon Hamm"? It's all part of negotiations, and is the reason why credits can be s... |
Why are children required to wear seat belts in passenger vehicles but not required for a school bus | Compartmentalisation. The way the seats are situated, which is close together and with soft backs, means the passenger would only be pushed a short distance in the event of a crash, and would hit something soft. Buses are also high, so the impact from a vehicle would be localised to below the seating . City buses in th... |
Why can I no longer speak my second language, but understand it perfectly. | When you say speak well, you mean pronunciation or just overall inability to find the right words to express your thoughts?If you mean the latter, than the question is not really obvious. There are great disputes in Linguistics when it comes to human capacity for language. Is there special ability in our mind that allo... |
Why is that so LDL is considered as bad cholesterol and HDL is considered good cholestrol? | EL5: if highways are your arteries and the fatty plaques that form in them that contribute to heart disease are car wrecks, then HDL and LDL are tow trucks. HDL is a tow truck that removes the cars from the wreck, while LDL is a tow truck that collects cars from other places and crashes right into the wreck, creating a... |
Could Coca-Cola make a decarbonated Coke? | I think you mean uncarbonated. It's not like they 'd put the carbon dioxide in especially and then take it right back out. So yes, they could easily make it by just mixing all the other ingredients and not carbonating it. Nothing about coke, or any soda today is naturally carbonated, they just force enough gas into the... |
Why can skiers travel faster downhill than human terminal velocity? | Terminal velocity is based on air resistance. The quoted value of human terminal velocity is likely based on a normally clothed individual falling face first with their body square to the direction of travel. If they turned so were falling either head first or feet first, they 'd probably fall quicker. Likewise the clo... |
Why two unrelated movies, songs or books can have the same title but video game titles are vigorously protected? | Because in most cases, a game's title is the strongest and most valuable part of its brand, which is often not true for books and especially music. In books and music, it is the artist/author which is the stronger part of the brand. For example, the album name "Midnight Love" may not mean much to you, but "Midnight Lov... |
What is being "matched" when a suitable donor is found for an organ donation? | The match is in the MHC or major histocompatibility complex. These are molecules on the surface of cells that allow the immune system to distinguish self from non-self. Mismatched MHC will cause the recipient to mount an immune response which results in rejection as the immune system tries to destroy the foreign tissue... |
What skill is required for car racing? | Attention span and great hand eye coordination. Imagine being on reddit for hours upon hours . You cannot use the bathroom and you are constantly reading a ton of information. Eventually you are going to get tired and worn out from doing the same thing over and over. Realistically, I can break it down a bit further for... |
Since plants make carbohydrates from sunlight using their leaves, how do weeds (like dandelions) grow again if only the root is left in the soil? | Most plants store some of the excess carbohydrates in their roots for regrowth or wintering. Dandelions store enough in their root structures to repeatedly restart the foliage growth when you pull the leaves off. Some plants even grow large specialized root structures specifically for storageThey have enough energy alr... |
How seedless fruits multiply? | In most instances seedless fruits are probably the result of genetic modification . So yeah, kind of like mules. Having said that, seeds aren't the only way that plants multiply, and are in fact kind not the most popular method of reproduction amongst plants. Lots of plants reproduce by essentially cloning themselves. ... |
How does credit card consolidation work and what does it do to your credit? | I 've done it before. I had several credit cards, the basics like Visa but also many store-specific cards like Macys and Talbots, and they all had high interest rates and I was only able to make minimum payments. If I hadn't consolidated I 'd have been making minimum payments for my entire life, probably. My credit uni... |
Who sets the "Serving Sizes" on packaging and why are they so ridiculously small? | The manufacturers set the serving size. They are ridiculously small so they can put smaller numbers in the unhealthy parts of the nutritional information, because most people don't think to check the serving size. |
If I eat a 5 pound burrito, will I gain 5 lbs immediately? | Yes you would gain the 5lbs for a very short period of time, until your body broke it down and metabolized some of it, which would begin immediately. Don't test this though, 5 year olds should not be eating 5lbs of burritos |
Is the ocean floor beneath the lowest point of the Mariannas Trench as pressurize as the surface? | It depends exactly, but most likely you would experience less. Essentially that pressure you feel is just all of that waters weight above you. So if you were in a cave just below that, all that waters weight is being held up by the rock. As for the new pressure you feel, it depends on how your new ceiling is being held... |
What happens in your body when you consume alcohol or do sports while taking antibiotics? | Alcohol very-very sugary . Goes in your body. Body wants to add water to make alcohol less sugary . You drunk, no water nearby. Brain 80% water. Body takes water from brain . Brain thirsty. Starts running merry-go-round . You become unconscious. This is the best way I can explain to a 5yo. You can ask me to explain it ... |
Why is it that I wake up in the middle of the night with my arm essentially paralysed with no motor control and it'll take around 30 seconds for my hand to fully function again? | Your body is positioned in such a way that it's putting pressure on a nerve in your arm. The pressure inhibits the nerve and blocks the path of signals being sent from your arm to your brain and vice versa. When you wake you shift your position such that your body weight is no longer putting pressure on the nerve and p... |
why does it hurt so much when you sneeze and fart at the same time? | When you sneeze, your abdominal pressure increases, squeezing abdominal guts upwards against your lungs. The side effect is the potential for a super-high-pressure fart. |
Why does it hurt to put hand sanitizer on a cut? | some antiseptic compounds will lower the threshold at which pain receptors will be activated. If you think of the pain receptor as a sticky switch that needs a certain force to trip it, the sanitizer greases the switch and whatever "undetected" sensation you are experiencing now suddenly trips the switch and you feel t... |
Why dogs don't see colour? | Humans have what is called trichromatic vision, which means we have three distinct sets of pigments in our eyes that allow us to pick up on 3 distinct ranges of color. Dogs as well as most other mammal species have only 2 pigments, although some species have only one and some humans have 4. It should be notes that the ... |
Why does water turn into vapor from cold temperatures? | The fog you see is due to the condensation of water vapour that's already in the air. At relatively high temperatures water molecules move rather quickly and when they bump into another molecule they just bounce off, similar to what happens when rubber balls collide. At lower temperatures however, the colliding water m... |
Why are police in the US using more and more military/unnecessary equipment? | You're pretty much right but I think its also kind of a cop out answer that we get. The wars are winding down so yeah there is a lot of surplus equipment but why not just keep it for the next war? Because then defense contractors would cease to create profit. And there are so many voting districts with defense companie... |
How come whenever there is a commercial break on tv, I always see commercials cut to the end rather than it showing the whole thing? | Because usually the time slot given is 30 seconds long and it is a few seconds over, or it could be that they put a commercial in the wrong slot so they xut it and put the correct ad in, or perhaps its just a glitch. |
What happens to the cars that dealerships don't sell? There's no way some dealerships sell every vehicle before the next year's models ship. | They reduce the price, and keep selling them until they're gone. There's always going to be somebody willing to buy last year's model car at a discount of a couple thousand dollars. Each new year's car model is not like each new iphone model, the differences are pretty negligible, you're not missing out by buying one y... |
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