query stringlengths 8 249 | answer stringlengths 45 7.8k |
|---|---|
Why can a 20 minute video take 5 minutes to upload onto YouTube and then the same video, take 40 minutes uploading to Google Drive? | One is a profitable platform that generates revenue. One is a service mostly used for sharing in group formats or as a personal cloud storage. I'd guess one has a better server than the other. |
Why does a full circle equal 360 degrees? | It's just a convention. We could also measure the angle in radians where 2*pi = 360º . We could also measure it in terms of a percentage , but aside from tightening bolts/pipe threads, this is an uncommon way to measure angles.Short answer: There aren’t so much 360 degrees in a circle as a circle was assigned to be 360... |
Why do video game console makers lose money from consoles regardless of success and popularity? | Console manufacturers also manufacture other things. Microsoft makes operating systems and other computer hardware and accessories, and everyone knows about Sony and their TV's and stereos and whatnot. They also sell their online services that need regular renewal and that are often required for multiplayer gaming. |
- If some company were to start selling EpiPens at $100 instead of $600 would they not make tons of money from the millions of people wanting to only buy from them? | The stuff inside the EpiPen isn't the issue. It's the delivery mechanism. The *way* the EpiPen works is what's unique. There are alternatives but it's the best both in terms of medication and how to get in into a person.There are already alternatives available to "EpiPens". Some of these alternatives are Adrenaclick, A... |
Moles. How do they form? And are there people who don't have any of them? Is it even possible to not have any birthmarks or moles at all? | they're cells from the neuroektoderm there due to an error in their migration, the cells have lost their dendrites and are therefore rounded as opposed to normal melanozytes. it is possible to have none at birth and it is also possible to gain new ones.On a related note, can anyone explain this? I’ve noticed that withi... |
How do Dimensions work? | First, let's change the word dimension to variable. The most familiar variables you're used to are probably the one's we typically use in describing space in Cartesian coordinates. But you can have other ways of describing things in space! As an example, you can use the radius, theta and phi . [_URL_0_] You can also ha... |
Why don’t we feel the Earth rotate if it’s spinning so fast? | For the same reason you don't feel speed in an airplane - you feel acceleration, not motion. |
If the US is a secular state why does the dollar bill say "in God we trust" | Because the U.S. is not a 'secular state'. The Establishment clause precludes the affiliation of the federal governments with a specific institution of religion. So the government can't require you join the Catholic Church or give special favoritism to the Church of Latter-day Saints. However, generally pro-religion se... |
How did old hand-drawn animation achieve such consistent color? | If I'm not mistaken, Adam Savage , former ILM) has discussed this before and recalled the days where he would have to paint the different layers on the cell and work out what colour it would be based on where it is on the stack. The further down, the more the colour changed, so they'd need to know how many layers the i... |
why are most states’ capitals not their largest city? | Often, a state capitol will be the largest city, but from some other point in time, and over time, other cities will outgrow the capitol. Other factors may also contribute to the capitol's placement; such as proximity to other cities, centrality, and convenience.For the original colonies and the early states, the gover... |
Why does an extra proton here or there make such a difference in the properties of an element? | If you are collecting the 151 original Pokemon cards, and you only have 30 or 50, it's no big deal. But if you only need 1 or 2 cards to complete your collection, you are a little more dangerous. You are more likely to spend a lot of money on packs, to buy a card outright, or even steal a card outright. But once you ha... |
Why is it so necessary to leave a tip in the US? | Because in the U.S., in almost every circumstance, servers are paid *well below minimum wage* because the government assumes they will be compensated with tips. There are a couple of jobs, like servers, that are exempt from minimum wage standards for this exact reason. It's stupid and only serves the restaurant/employe... |
Why do car seatbelts have one strap whereas airplane pilot seatbelts have two straps? | Cars are more likely to take on abrupt but survivable impacts. The seatbelts on a plane aren't for a crash from the air so much as to keep you in your seat during heavy turbulence.Car self belts are meant to protect you in a crash.Airplane seat belts is just there so when there’s a crash, the police can identify the bo... |
How can an 2D animated movies or shows have multiple animators whilst maintaining a consistent art style? | That's kind of a funny question form the perspective of someone who used to draw A LOT. Usually, when you start getting interested in drawing, the FIRST THING you do is mimicking. You try to reproduce your favorite artist's style, then switch to other artists as you evolve, and finally get your own style, but that's th... |
How are really tall buildings able to withstand high winds? | Few different ways. As other people have pointed out, they'll have weights that can weigh hundreds of tons to counteract any sway. Another way though is to shape the building to cope with the wind. Many skyscrapers will get thinner as you go up since the wind gets faster the higher you go. This is super notice with the... |
Do we lose metal forever when it rusts? | Yes - *if* you can keep the rust around. Rust is just iron that has combined with oxygen, and if you heat the rust enough, it will break the bonds, release the oxygen, and give you pure molten iron. Straightforward enough. In fact, most of the iron we mine out of the ground comes out as some form of iron oxide - chemic... |
In tv shows and movies, why do really giant people/creatures always move so slow? | Antman makes no sense. Especially when you consider his weight shouldn't change. Smaller nervous system would allow it to react faster. Inverse is true too.Look at how fast a mouse or lizard can move compared to you. Greater mass = slower speed for living creatures. |
Could the world eventually become one race through the interbreeding of races over time? | Yes, and no. In a perfect scenario where everyone interbred equally you could achieve this. However, in practice, even just two communities who live in different environments and do not interbreed equally will eventually grow to have different genetic developments that are specific to their situation. This will become ... |
What's the digital process of lowering the quality of a photo or video? Also is the opposite process a thing or just movie things? | The process itself depending on algorithm. But generally, algorithm tries to analyze an image and find it's less significant details and then remove it. For example if you have three gray pixels in a row with middle one just barely darker, algorithm could decide that this color deviation isn't important and make it sam... |
Why is it that babies like being rocked to sleep yet as we get older rocking can be uncomfortable such as on a boat? | I don't think that rocking becomes uncomfortable as we get older. Many people like rocking chairs, for example. Boat rocking or airplane turbulence is uncomfortable because it's not steady, it's uncontrollable, and can be dangerous . But slow and gentle rocking at a steady pace that you're in control of? That shit is t... |
What role do companies like Visa and MasterCard play in credit cards and why can’t banks issue their own cards? | Every bank *does issue their own cards.* You don't get a card from Visa or Mastercard, you get it from your bank. The Visa/MC logo on the front of the card just says that transactions go through the Visa/MC network for processing. Visa/MC just provide a standard way of communicating between the stores and banks. If you... |
Wisdom teeth extraction - couldn’t it be simpler? | I'm not sure if you are under the impression that all wisom tooth removals require surgery, but they can often be done as an extraction like any other tooth. |
What is gerrymandering and how does it happen? | ELI5 does not allow current events. Questions about the US are generally better in r/askanamerican, and given that there are many possible answers to your question about “how do we solve the problem” I'd put it somewhere else for that reason too, since ELI5 also does not allow subjective content. TL;DR Politicians like... |
Why does it seem so challenging now to send a manned crew to the moon, when we were able to accomplish this over 50 years ago? | AFAIK, it's a relatively ~~low~~ high cost to benefit ratio. In other words, it would cost A LOT of time & money to make it happen, with not a lot of benefit. That being said, there are plans to use the moon as a 'base' for further exploration . So if/when it comes time for that, there will be much larger benefits to h... |
Why has split screen gaming disappeared? | One of the issues that hasn't been mentioned is that FFA deathmatch and small game modes like 2v2 have also fallen out of favor. By far the most popular games are team based shooters or wide open battle royale games where 4 players are far less fun.They have to implement Internet multiplayer anyway, because it's expect... |
What are the benefits of leasing a car over buying one? | There aren't, don't do it. Only benefit is if you are well off and just enjoy swapping cars out a lot and don't want to bother selling. |
Why do the Japanese refer to themselves with their family names in public? When is it okay to call them by their first names? | That doesn't strike me as particularly odd. Even in America if you're being formal or just distant from someone you may refer to them as Mr/Ms Lastname. |
When you exercise your muscles ache afterwards, so how come your heart doesn’t ache after doing cardio? | when your heart isn't getting an adequate supply it does ache, its known as angina and if progression takes place, heart attack.Iirc, The reason your muscles hurt is because of micro tears from the strain of a work out that cause a build up of lactic acid. This acid is what makes you sore. The heart doesn't tear like y... |
Do we really need to get our wisdom teeth removed? And what takes place after your wisdom teeth are removed? Do they just come back? | i didn't do anything on my wisdom teeths and all four came out all natural and perfect. The push through the gum might irritate a bit for a few days .After the push-through they might take like half a year to fully grow out. |
Why do most video games only run on Windows and not Mac OS? | Because almost 90% of all computers use Windows. Most developers don't want to bother making games that less than 10% of computers can run. [Desktop OS Market Share] |
Why do frozen, raw chicken products keep getting recalled for salmonella? Wouldn’t the solution be to cook the product properly? All raw chicken could contain salmonella. | It's because there is no way to guarantee that everyone will cook the chicken properly and, even if they do, there's no way to guarantee that all of the salmonella is killed by cooking. It's much safer and cheaper to recall chicken than to sell contaminated chicken and then have to spend resources treating the infected... |
How does one develop a "taste" for a food or beverage that they initially disliked? | Most of the foods I've learned to like I ate when I was really hungry. I guess I'm less picky the hungrier I get and maybe my taste buds are more open-minded? In the end it creates a positive memory of the flavor and I learn to like whatever food I was eating. |
Why don’t saltwater fish absorb the salinity of the oceans and taste salty? | Everyone is saying that the salt get filtered out but I'm not so sure about that. I had shark once and it was too salty for me |
How did large congregations of people hear speeches (i.e. Lincoln's address, and countless other older speeches) without the use of microphones? | I think crowds were much quieter and listened. Because of PA systems people in crowds are much louder because they can be. The PA system at a basketball game, for example, is insanely loud. As a result, people in the audience are yelling at the person next to them. It's like an arms race. |
Why isn't solar energy widely used? | I'll assume you are referring to solar to electric systems. The largest problem aside from getting panels would be storing the energy for use later. Batteries are expensive and don't last as long as a panel. |
why are wind turbines shaped like that? Would having wider blades or more than three blades give them more energy conversion for a given wind? | It's a simple cost/effectiveness measure. More blades = more cost. You've gotta remember that those blades aren't simple static blades. They move, they turn into the wind or out of the wind depending on how fast the wind is blowing, kinda like how a helicopter blades pitch to get more or less lift. Therefore, in stormy... |
Other than allowing people to believe whatever they want, what legal protection does Freedom of Religion actually offer? | It doesn't give any additional rights-but neither does any amendment except the 14th- it just creates a second level of protection from government discriminating unfairly against a religion. The establishment clause is related, but distinct legally. > The Court examined whether the state of South Carolina violated the ... |
Why fried chicken is so common but fried beef is nowhere to be found? | I don't think you're looking hard enough. Beef is fried in Chinese / Americhinese cuisine, prime example being Panda Express' Beijing Beef - essentially 'beef nuggets' that are deep fried then sauced. Beef is also stir-fried in a lot of other cuisines. In Asia, Central, and South America. But it seems like you're speci... |
What makes burner/trap phones untraceable by the police? | Burner phones are almost always pre-paid phones. These are phones that you can buy from stores like Walmart or Bestbuy. They already have numbers programmed into them and the purchase price includes a certain amount of minutes/data that you can use. IE: You pay $100 for a phone, it includes 1GB of data or 500 minutes o... |
Why do some gasses have an odour while others are odourless? | Around electronics or electrical applicanaces, you often smell ozone. Ozone is created when oxygen molecules in the presence of a lot of energy, fuse together to form a 3 atom molecule instead of a 2 atom molecule . We can't smell oxygen, nitrogen, hydrogen, etc. normally because we literally are breathing that in all ... |
Why can’t we remember things that happened before we were 6-8 years old? | I don't know that's necessarily true. I clearly remember kindergarten and first grade. My brothers were in the US Navy when I was born. They are 17 and 19 years older than me. I was about 2 years old when their ship was in port, and my parents took me to visit. I I remember walking along the deck, my hands being held, ... |
My apartment key opens my own door, but also the communal laundry room, communal basement and communal elevator keyhole. How does that work? | A lock works with pins that prevent the tumbler from turning. The pins are in two parts. When the key pushes the pins up to the right level, the top part of the pin is fully in the body of the lock, the bottom part remains in the tumbler. This allows the tumbler to turn. There are a few ways to make the system you have... |
What's the difference between a war and a 'cold war'? | A Cold War is a war fought without the use of bullets. Obviously, that's an oversimplified answer, in the fact that even in the American/Soviet Cold War, there were armed conflicts, like Korea and Vietnam, as well as border skirmishes and missile crises, but there is not all-out war between the primary antagonists of t... |
Why is it a son named after his father is a “Jr.” but a daughter named after her mother not? | That's not 100% true my mother and grandmother share the exact name with the exception of my mom has 'Jr.' after her last name. It's on her original birth certificate, her SS card, and even her DL. However, she's the only female I know who is a Jr and even then the only female I know that shares a name with her mother"... |
Can a fat person die of starvation, or does the body *always* eat up its fat stores before starving? | When you don't eat food, your body can use body fat to make alternative fuel called ketones. It can also make enough glucose to meet the very small bodily needs for actual glucose, that ketones can't meet. If the fat person is drinking water and getting enough salts then they will not starve until all bodyfat is gone. ... |
Into the wild blue yonder... | Think of it more like water and/or frosted glass. A glass of water doesn't look blue but what about a fish tank or a large aquarium. If you have frosted glass in a dark room it isn't going to look like anything however if you start to shiny a light it will diffuse that through it. Combine these together and you get the... |
How does buoyancy work? | There's some good answers here, but I would say the ELI5 version is that metal ships are made of metal & air. Metal on its own will sink, and air on its own will float, but a metal shell around air will float if there's enough air. That's why ships and boats will sink if they take on too much water. |
Is it possible to use split radioactive waste until it reaches a stable element? | Bombarding stable elements with neutrons will turn them to radioactive isotopes at the same time, so you're not going to reach just stable elements that way. |
I understand that at the end of the day consumers pay for tariffs, but where does the money from those tariffs go? | They go to the government. The government could earmark those funds for specific purposes if they wanted to, but in general they just go into the government's general fund. |
why is Australian internet so bad compared to the rest of the 1st world? | It's improving in terms of speed, but you're dropping relative to the world Historical info : [_URL_2_] Current stats: [_URL_2_] Basically - you have two ways to roll out highspeed internet. One is to have consumer demand in dense enough regions with either cooperative regulation to roll out highspeed internet. The oth... |
how can the universe be expanding, when it is growing in to space that already exists? Isn't that just discovery over expansion? | I think it's going to prove impossible to explain this as though you're five as some of the most brilliant minds out there still don't quite understand. I think the closest is that it's expanding into something that doesn't exist until it's expanded into? |
How does your stomach know the difference between food/liquid - bowels/bladder? | It doesn't. It all goes to your bowel, where nutrients and water are absorbed into your blood. Meanwhile, your kidneys are at work pulling water out of your blood and into your bladder . |
Why are the front of commuter trains flat? | After you factor in all the weight of the entire train, and the long snake like shape, and the lower speed, i don't think there is much savings at all. The cost savings of having similar shaped cars probably outweighs the energy savings of having a different shape.There is the practical standpoint of maximizing interio... |
If neutering or spaying an animal is necessary to prevent unwanted babies, why not just give them a hysterectomy or vasectomy instead? Do the remaining hormones still have other negative effects? | Spaying and neutering have the added benefit of reducing or preventing several kinds of cancers too. If the testicles and ovaries are removed, they can't develop tumors. Unspayed female dogs have a 25% chance to develop mammary tumors, compared to 0.5% rate for spayed dogs and 12% rate of breast cancer for humans. |
Why are busses significantly safer than cars when they have far fewer safety features (eg airbags, seatbelt etc)? | The danger from accidents mostly comes in the form of rapid deceleration. Many of the safety features in cars are to help you decelerate as softly as possible. The front of the car may come to an extremely sudden stop, but the part you are in just keeps going slightly slower for a bit as the front crumples and the seat... |
Why do rockets spin on their way up? What purpose does the spinning serve? | Spinning a projectile assists in keeping it stabilized. It helps by preventing the projectile from tumbling, which would ruin the aerodynamics and make it less accurate. IE: If the projectile begins to pitch upwards, since it's spinning, that small pitch would quickly face downwards and the aerodynamic forces would pus... |
How did they record music before computers? | Depends on how far back you wanna go. Generally: Artist performs and is recorded, that's re-recorded again and again from the initial record to make all the copies. The rest depends on the medium . |
nightmares? Why would your brain scare you? | you are your brain, so your brain is scaring itself . As many have said, no one really knows. My guess is that there are parts of the brain that when we are awake are highly muted / repressed; but when dreaming they bubble to the surface. Could you bash someone's head in with a hammer? Odds are you couldn't BUT, your b... |
How do antidepressants cause weight gain? | It depends on the medication, but the 2 that I've seen cause weight gain were caused by increased water retention. |
Why is it hard for phone companies to supply unlimited high speed data? | Ok try again with a lot of extra words because auto mod doesn't like short answers It isn't; companies limit high speed data to try and convince you to buy the more expensive plan that give more high speed data |
Why did we spit the day in half with AM and PM? | Solar noon is easy to observe without instruments and it happens at about the same time regardless of season, it's only off by 6 or so minutes, unlike sunrise/sunset which drift several hours. So it was just a natural split for ancient people to see time as before noon and after noon on their sundials or whatever. Anot... |
how do energy companies safely obtain radioactive material for nuclear power plants? | There are highly regulated facilities that produce the fuel rods. Uranium can be mined in some places. That has to be enriched to be usable as fuel for the usual reactor designs. As long as the reactor wasn't started yet the fuel is not that radioactive. That happens when you start the chain reaction and you get fissio... |
the national debt of the United States. How bad is it, and what are the short- and long-term repercussions of having a 104% debt-to-income ratio? | Much of it is simply money we owe ourselves at a later time. If I give you $5 and tell you to pay me back in 20 years, you now owe me $5 and will for the next 20 years. That's not a bad thing because I don't even want that money back right now. |
How does an increase in buying something cause the price to increase? | If I get in a shipment of avocados and sell them for $2 and sell out almost immediately, and I want to make more profits then I would be foolish to not raise the price to $2.50 so I can make more money. Additionally, my supplier might be doing the same thing, so instead of paying $1 to him, he's now charging me $1.25. ... |
what is the purpose of non-antibacterial/normal hand soap? | I think normal soap is meant to just kill the basic germs that are more likely to get you sick. Antibacterial soap is typically used for dishes and in restaurants because they need to be sure they get the majority of the bacteria off of their hands. Antibacterial soap is meant to reduce any and every type of bacteria t... |
why is it that sometimes when drinking hot/cold water you feel it down your chest but other times you don’t? | For me it seems to be linked to indigestion. Perhaps it's because the esophagus is tender due to exposure to acid. |
What shapes our handwriting and can it be changed? | Can't officially answer, but both my brother and I write really similarly to our parents. I write like my mother and he writes like my father. Maybe genetics have a say?", 'In the navy we were forced to write in block all caps. I got out in 2015. I still throw in random capital letters in the middle if my writing. Irri... |
; Why is dark skin selected for when you’re in the sun a lot? Dark colors absorbs most visible light, while white reflects it. Is it different for UV light? | You get all of your vitamin D in about 7-10 minutes in the sun with no sunscreen. Past that you start to risk burns . Eventually darker mutations, which have more melanin to stop the penetration of UV rays, would be selected for as they wouldn't be in pain often and would have a lower risk of melanoma.It's not the colo... |
why is it easy to cross your eyes, but almost impossible to have each eye point outwards (left eye looks left, right eye looks right)? | We cross our eyes naturally to perceive depth, we have muscles that are made precisely for that. Look towards the horizon, your eyes are nearly parallel. Look towards something really close to your face, your eyes are crossed. Don't really have a developed muscle that does the opposite, because there's no biological ad... |
Why do people confuse left and right but not up and down? | Left and right are just names we give to directions that are mirrored but in every other way indistinguishable. So when you learn left and right you'll have to remember which way is which without any clues from your surroundings that tell you which way is right and which way left. When it comes to up and down there are... |
What is preventing us from effectively storing energy harnessed by windmills and solar panels? | There's a giant battery in Australia that does just that. Given the cost and lifespan of the battery and the transmission, charging and discharging losses, many people expected it to be a boondoggle . Because power becomes more expensive as the grid runs out, the battery has more than paid for itself by buying low pric... |
How come sometimes when you take a drink, it causes extreme pain and discomfort as it goes down? | Everyone has this. It doesn't happen that often. It is hard to describe. It's like you swallowed a rock as it goes down. Everyone I know in real life has had this happen before at least once. It seems to only happen with pop. |
If Hong Kong belongs to China, but has its own legal and political system, in what sense does Hong Kong belong to China? | To answer your question plain and simple if you would like Honk Kong is what's known as a 'Non-Sovereign City State', If you dont know what a city state is, it is basically what a city and its surrounding territory is when it governs itself, just like spartan and Athens in Greece, so examples of SOVEREIGN city-States a... |
Why does it hurt so much when you drink orange juice after brushing teeth? | I'm pretty sure it has to do with the toothpaste numbing the sweet taste receptors on your tongue, so you only taste the bitter parts of the orange juice and not any of the sweet parts. |
How does Microsoft and Sony compete with similar specs? | Before the 2010's, most game consoles used different platforms. Both the 360 and PS3 used custom Power-PC CPU's, but they used them in very different ways. The PS3 used them in a cell processor configuration, while the 360 used them in a relatively normal way. This lead to very different specs, as they ran games quite ... |
Why does head lice always spread in schools? | Summer camps are another common place for lice to spread, to the point that some I've worked at had a lice check as part of the check-in process on the first day. |
why do lips get chapped in cold weather compared to hot? Doesn’t the hot air absorb the moisture more? | Air is like a sponge when it comes to holding water. Hot air is like a sponge that isn't being squeezed it can hold a lot of water, and if it's dry it will steal water from it's surroundings. Cold air is like a sponge that is being squeezed it can't hold a lot of water. Your heater takes the dry cold air from outside a... |
Why does shampoo bubble so much more on the second wash? | _URL_0_ I think you're wasting shampoo if you're looking for bubbles. The first wash through is sufficient.Is "Rinse, repeat" something people actually do? I honestly thought that was just a marketing gimmick / way to get you to use more product faster.adding to what else has been said, shampooing twice strips those na... |
How is insurance profitable for insurance companies? | > A common policy is $20 per occurrence of $100,000. Wouldn’t that take 5000 months just to break even? For a single person, yes. But you have thousands, tens, hundreds of thousands of people paying into the insurance, and the odds of people having a claim are low. There's an entire branch of statistics, *[actuarial sc... |
How can you pinpoint your location with GPS on your phone without service on the ground, but can’t do the same on an airplane? | In a purely satellite based GPS, it can take minutes to acquire a signal and position. And this doesnt work well if you're moving fast. When you're on the ground, there are many assisted methods of acquiring a GPS signal. |
When your iris changes in size from light why does does the area we can see not change? | What matters for the area we see is the angle of the light rather than the size of our pupil. I made a quick photoshop diagram [showing the path light would take if you were looking at a red dot right in the corner of your vision] for different pupil sizes. It doesn't matter whether your pupil is big or small, the ligh... |
What's the basis for US Confederate support today? | Most modern displays of the flag use it as a symbol of rebellion or pride in the South, Southern lifestyle, or values. People saying it's purely racist are voicing an opinion, not fact. |
How can scientists be confident that GMOs won't have multigenerational impact? | Mice flip through generations faster than iPhones, so you can get ten generations deep in a mouse lineage in a just a few years if you're trying to determine how something effects the great great grandkids. More generally, the DNA in your food doesn't meaningfully survive the digestive process. You're not full of rogue... |
With so little land and resources, how is Great Britain still as rich and powerful as it is today? | Britain has a primarily service based economy. Most of the money is made from financial services and technology. Also some manufactured goods like cars. Britain doesn't have many natural resources to export , so generally speaking we import a lot of stuff to support our industry. |
how slavery worked in prehistoric/ ancient times. | With great difficulty. Check out the Spartans. They were renowned as the greatest warriors in Greece, and they absolutely crushed their enemies. But you can't be a full-time soldier unless someone else grows your food. So they kept a slave caste of 'helots,' who did all the non-soldiery jobs. This created a big problem... |
Why do CO2 levels keep rising? | So it is true that more and more renewable energy is being generated, but our population is also increasing, and poorer countries are starting to produce CO2 at the same rate as richer countries. Richer countries are starting to use more renewables, but they can be expensive to build and they can't always provide power... |
What is a bone marrow transplant? | There are actually 2 different types of bone marrow donations. The first is the traditional marrow method. Needles are used to go into the donor's pelvic bone & withdraw marrow. The second type of bone marrow donation isn't even technically bone marrow at all. It's peripheral blood stem cell donation. For 5 days leadin... |
Why didn't we ever get immune to colds if it's so common? | The cold is not a disease. It's a collection of similar symptoms caused by hundreds of different viruses that are constantly mutating. Getting a cold from particular virus means you can still get a cold from the many other strains of the same virus and a hundreds of other viruses. |
How/why do cars with a start-stop system not use more gas or harm the engine more than regular engines? | Your engine uses the battery to start so there isn't any extra fuel usage when starting again at a green light. The fuel is saved by shutting off the engine when you fully stop the car so it doesn't run the whole time at a red light. It doesn't harm the engine because when you take off at a green light, the car is doin... |
Why does aluminum foil never get hot to the touch. You can leave it in the oven and touch it directly out of the oven without it feeling hot. Why is this? | Very high surface area:mass ratio. Heat capacity is related to density , heat transfer is related to surface area. The aluminum heats up to the same temperature as everything else in the oven , but a sheet of foil has almost no mass, but tons and tons of surface area. This means is 'exhausts' its heat very quickly. If ... |
How is a word created? How does it become a generally accepted term by a population? | Have you ever read the book, Frindle? It's a cute story and the main character asks this exact same question. |
Why when i'm trying to sleep, sometimes my body do the fake fall thing ? | I always learned it as when your heart rate drops to quickly as youre falling asleep, your body jolts you to get your HR up. Essentially your body thinks you're dying cause your HR is dropping so it sends a jolt to restart.i had always heard this referred to as the "primordial shake", an instinct to keep yourself from ... |
- Our bodies signal us that we are hungry but we generally have a lot of energy stored as fat. Why is that? What is the hungry feeling is telling us in fact? | Stored fat is for survival. Until the body absolutely needs it, it burns all other available fuel first. After that it burns fat, but reminds you that you are now in starvation mode,burning fat with no input to offset. The body can't tell you have food available but are choosing to not use it, so don't remind me I need... |
how come doctors and nurses (or anyone working in the health care environment) are not constantly sick or catching stuff from infected patients. | For the same reason that porn stars don't get STIs even though they are having sex with lots of people all the time. They use proper precautions consistently. Precautions means frequent handwashing, gloves, disinfecting surfaces, getting vaccines, etc. Consistently means that they are all aware of the heightened risk, ... |
Why is water (H2O) effective at putting out fires when fire requires oxygen to keep burning? | Let's say that, in order to live, you need to hold hands with someone. Not just anyone, but your friend, Oxy. She's very nice and you really want to hold hands with her. But, it turns out, she's already holding hands with the Hydro brothers, so she can't hold hands with you. Sad. |
Why do so many things in California cause cancer? | No, they are just hyperactive about public education regarding carcinogens. A bit loony if you ask me. These substances are plausibly carcinogenic everywhere. Other states just either haven't studied causation or didn't find any if they did. |
why cant different species breed with each other? If they both have sperm and ovum? | some of them can, actually! there are cross species hybrids between e.g. Lions and Tigers, and between Horses and Donkeys. Some of those hybrids are actually fertile themselves but most are infertile. & #x200B; the reason why most different species can't interbreed is really complicated and I think you'll get a better ... |
Why do household smoke alarms use D batteries instead of the more common AA batteries? | Smoke detectors don't use D cell, they use 9-volt, which based on size, are more efficient than AA/AAA |
Why does going 100mph in a car feel so much faster than going 500mph on an airplane? | Our perception of speed depends on the things we see around us. If a plane were to fly inches above a road, you'll see blurred trees racing back. But there's no reference point for miles when the plane is up in the sky. So everything looks like it's moving back slower.If the plane flew a few feet off the ground instead... |
How do metal detectors only sense metal? | Everyone pretty much explained how it works. It does not have to be a typical ferromagnetic material . It can be any conductive metal. Why I am making a comment here is because no one mentioned the technical term for the mechanism. It's something known as 'Eddy Currents'. Look it up on google, it'll give you an exact i... |
Subsets and Splits
No community queries yet
The top public SQL queries from the community will appear here once available.