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Why isn't there an ad blocker which still generates revenue for websites? | Advertisers don't keep spending money on ads if they don't have an effect. This will be good news, until 2 possible outcomes: * The site you're visiting doesn't make any money and needs to close because it doesn't cover its expenses.* advertisers figure out an other way to serve ads that bypass adblocks", 'What about a... |
How do escalators maintain the same speed regardless of how many people are on them? | The real question is, why aren't escalators faster?", 'It is using an Alternating Current motor that runs at a constant speed, the speed is directly related to the frequency of the AC power, 60 Hertz in North America. The motor is sized with enough torque for full load. Running it at no-load it will run at the same spe... |
How were pigeons taught to deliver messages to people in the midievil times and how effective were they actually? | Fiction has exaggerated this quite a lot. Homing pigeons are very good at getting back home, but that's about it. So you keep them somewhere where they're well fed and cared for, then you take them with you. Need to send a message, release one with it and it'll fly home again.They were not taught. The pigeons know wher... |
When giving mouth-to-mouth, how does the other person receive oxygen instead of CO2? | You only use a little bit of the O2 you breathe in. Normal air is 350ppm CO2. 8% is dangerously high. Human exhaust is 4%. Sure, that's 100x more than normal air, but not a dangerous amount. |
how do skiers survive such high drops without dying or severely injuring them selves? | EDIT: I misread the post, ignore me. There is a point when something falling through the air where it stops increasing in speed. It's called terminal velocity. Terminal velocity is dependent on many things but largely on the surface area and porousness of the material. So increasing your surface area with a parachute d... |
What makes something "biodegradable"? What are the conditions necessary for something to biodegrade? | There is often a little confusion over what biodegradable actually means in terms of plastics. Biodegradable means that a plastic will degrade into smaller pieces of plastic, down to microscopic level, never actually going away eat it? Then it's biodegradable. If not, you rely on chemical reactions.Conditions for biode... |
What is that fizzing sound in the back of my neck when I'm super hungry? | I dont know but it happens to me too, and was made fun of when I commented it to my family.It's like a fizzy feeling going from my stomach in the front through the shoulders and meeting in the back of my neck", 'Is it like having pop rocks in the back of your throat? |
Why is it that when putting somebody on speaker phone when calling them, the microphone doesn't pick up their voice - resulting in them hearing themselves talk? | This actually does happen whenever my partner calls me from her car. I'll say something and then about a second later my awful voice will come back through my phone and completely distract me from what I was saying. Drives me bonkers. |
Apart from the obvious fact that gold is given value by everyone and THEREFORE has intrinsic value, what exactly is the big deal about Gold? | - The symbol of gold is Au, from the greek word aurum, which means glow of sunshine. The english word gold comes from the words gulb and ghel referring also to the color. It is the only metal of this color. - Gold has unique physical chemical characteristics that made it very valuable. Gold is the most maleable and duc... |
Before the widespread distribution of clocks/watches amongst the working population, how did people get to work on time? | Many buildings had clocks on them. It's something that looks good on your storefront, and it's a small service to your community. Banks were particularly common, and almost all train stations had a large clock visible from out front. Bells signaling time were also common, like Big Ben.People usually worked where they l... |
Why do some states require you to reveal your identity when you win the lottery? | how effective would it be for the winner to legally change their name after they've been publicly revealed as the winner. Or does a name change leave a public paper trail that would make it useless for this?", 'It’s more that they want the promotion - those photos of ordinary people beaming with big checks in hand. It’... |
How does a railgun work and why are there no flames while the projectile is in the air and then lots of flames and sparks on impact? | a rail gun accelerates it's projectile using electromagnetic force rather than controlled explosions like a tradition gun or rocket, hence no flames. the sparks on impact are due the energy of the collision. |
The 'Rail-Gun' and why it's such a big deal? | As to why it's such a big deal Ship ammo is an extremely dangerous thing. If a ship is hit and the magazine is reached, then a very possible result is the entire ship exploding. One hole in the wrong place, and the whole ship goes [kablooey]. You can't armor a ship enough these days to survive hits, so carrying a crapl... |
Why does it take so much speed to go into outer space? Could we just build a elevator out of steel cables and pull ourselves to space? | People have been talking about space elevators for a while, but it's likely impossible to build one given the tremendous amount of resources necessary, the weight, and the structural stability of it. Not only that, but it would be very impractical because you'd have to build an incredibly tall structure to begin with. ... |
How does a liquid gel tablet of pain reliever work in your system? | > Additionally the idea is that you can OD on an over the counter pain reliever like Advil. You can, but part of the reason why they are safe to sell over the counter is that you would need to take ridiculous amounts of it to overdose, on the scale of downing an entire pack in a day. Plus 'overdose' when it comes to pa... |
Why people can feel metallic taste of stainless spoons during sickness, but can't when they're healthy? | What do you mean can't when they're healthy? You can taste it, but just licking it usually doesn't work. Keep it in your mouth for a bit. |
What is chemotherapy and how does it work? Why does it work? | As others have said, they are poisons, but they are poisons that work in different ways. I had 4 years of chemo for acute lymphoblastic leukemia and my chemo drugs did specific things. Asparaginase - takes away an amino acid cancer cells need to grow to kill them. It can just kill a person nearly instantly each time it... |
; it’s not the volts that kill you, it’s the amps? | It's a little bit bullshit. It's very similar to saying that it's not the fall that kills you but the ground. Voltage is potential, same as height. Without a lot of it, you can't drive enough current to be dangerous in a human body. Also the voltage and current relationship is linear. So given some constant resistance ... |
How do we know we haven't found a groundbreaking cure for a disease yet, and that it simply doesn't work on mice? | I think there is a massive misconception that studying animals with a low match to humans couldn't reveal useful medical information. All the simple medical solutions have been discovered. Medical and biological research today are focusing on the very fine details. In many organisms we are now studying the effect of on... |
Why do triangles help to strengthen structures? | Short answer: Math! Not quite ELI5 answer: A triangle has sides and angles, and if the three sides are certain lengths then they must be at certain angles. Four sided objects can have the certain lengths at many different angles So if you take three pieces of wood, nail the corners together to make a triangle, then the... |
why do women's pants all have stupid little pockets? | Wallets are for men and purses are for women. Some traditional bs. Wallets goes inside pockets, so men needs pockets. Purses don't go inside pockets, so women don't need pockets. So, they make fake pockets or small pockets for women forcing women to buy purses too. The companies who sell clothes see how much money they... |
Why do human diets consist of mostly food we have to cook or run the risk of getting sick, while animals are completely fine eating food raw. | Most animals aren't completely fine eating raw food: They just don't have a choice. Game has to be cooked very thoroughly because game meat often has parasites.This question pops up about once a month: those animals aren’t as healthy as they seem. They just can’t vocalize their despair', "There have been a lot of good ... |
How your DNA can be used to determine where your ancestors were from? | Human DNA consists of 2.9 billion base pairs , 99% of which we share with everybody else. That remaining 1% within which we differ from one another is still a whole 290 million base pairs . In 290 million base pairs, there's a lot of room to find commonalities between people of the same race, region, etc. |
What is special about this video camera that can record 10 trillion frames per second, enough to see light traveling? Why don’t all video cameras record infinite frames per second? | There's not much light arriving on your camera during a 1/10000000000000000 of a second. IIRC your eye gets something like a 0.1 quadrillion photons per second in normal indoor light conditions. A camera with a large lens could gather a hundred times more light, so when doing 10 quadrillion frames per second it would g... |
How can Japanese and Chinese keyboards work? | Rhode" you then choose the correct word.The japanese alphabets don't consist of letters, rather it's syllables. So the keyboards look like english keyboards, you can even install japanese language on your computer now and type in japanese just like they do. For example ke becomes け, which can then be combined with othe... |
How do airplanes manage flying upside down? Can majority of aircrafts do this? | The special shape of a wing helps create the lift, but is not essential. It is easier for the air to flow over that special, offset-teardrop shape, so the performance is better right-side-up. But even if you flip the wing upside down, things basically still work. Lift will be reduced, yes; the airflow will break away f... |
How to power supply splitters actually work? | Voltage is like water pressure. Imagine you have a garden hose filled with water, connected to a faucet. You seal up the end of the hose and turn the faucet on. Not much water will come out of the faucet, but the whole hose gets pressurized to the pressure provided by your water system. If you make a small pinhole in t... |
Why do drinking fountains have two separate jets of water that combine to form one arc? | Where on earth are those type of drinking fountains common enough for the OP to phrase the question as if that's the norm? All my life I haven't seen any such drinking fountain until seeing the 500$ picture someone posted in this thread. |
Why the crypto market is not recovering. | people don't think the price will go up, so they don't want it. you can search around for greater and greater explanations but this is basically it. |
If 52*7 is 364 where do we get our extra day to make a 365 day calendar year? | 52 is just a rough enough guide to how many days there are in a year but if you add the days of each month, you'll get 365. |
do animals have concepts of "pranks" or jokes within their natural social circles? | Well, there is [this video]. One could probably argue that this behavior somehow wasn't about mockery, but I really would like to hear that explanation. |
Why pregnant women have their taste messed up to the point they eat weird combos and odor of certain food make them sick. | It doesn't quite work like that for everyone. I haven't had any weird cravings - fried junk food in the first trimester, and cake in the third. I think I just really wanted salt and fat and now I want sugar and fat. I can't eat spicy food anymore because of the acid-reflux. Other than that, no change. |
How do some companies have authority to sell and manage internet domains when the internet isn't owned by anyone? | As mentioned by others part of the business model is to be a middleman. However most also host the website. They provide space on a server for the website interface, instead of you hosting it on your own machine. This means you don't have to do backups, maintenance, and other hardware work yourself. They also offered h... |
Why do migraines happen, what causes a visual Aura and why is the brain hurting itself? | Unfortunately, we aren't sure. Science hasn't been able to figure out exactly what causes migraines. |
Why not just eject airplane black boxes before impact? | The purpose of the black box is to record ALL of the flight and electronics data so that in the event of a crash, they can determine what went wrong and potential fix it so that it doesn't happen again. If something were to happen in those last 100 ft, it would not be recorded. Aerial mishaps rarely have eye witnesses.... |
Why do not airline have parachutes for everyone when the plane is about to crash? | If your plane crashes at take off or landing then you don't need parachutes, they won't help If your plane suffers a double engine failure at altitude your survival odds are better staying in the plane as it can glide quite far If your plane suffers a catastrophic depressurization at altitude, you won't be able to put ... |
What are you actually doing when you take the derivative of a function and why does it give the area? What about integration? | Derivative function gives the change of the function as it travels a very small distance. For example, consider the function y=x. Its derivative is 1. Meaning that if x changes from 1 to 2, y also changes from 1 to 2, i.e., by 1. Also, if x changes from 2 to 3, y changes from 2 to 3 by 1. This is because derivative of ... |
How are Open World Games like Red Dead Redemption 2 made in such detail? | The way large open world games operate for the world around you is a thing called draw distance. Imagine a bubble around your character. As you run towards a mountain a LARGE item it would come as hazy a little blurry, what you would be running towards is almost a flat image of the mountain as you are running things li... |
why do obviously guilty criminals plead not guilty (i.e. Pittsburgh synagogue shooter)? | Some really good answers, but put shortly it's because the defendant gains almost nothing by pleading guilty upfront. The prosecutor may offer a deal for any number of reasons, and pleading not guilty gives you the ability to negotiate |
Why are there so many different types of Police? | FBI deals with federal crimes - in the US some crimes are federal and the rest are state crimes. Murder is a state, not federal crime. Kidnapping is federal, if one crosses a state line while committing a crime, it's federal. It's a complex system because each state in the US has it's own government, own constitution a... |
The U.S. and Canada are about the same size, so why is the population of Canada only ~30 million while the U.S. has a population of ~300 million? | Almost all of US land is suitable for settlement, with a climate supporting local agriculture. A significant portion of Canadian land is not suitable for agriculture, so there's fewer people living there. Almost all Canadians live in the far southern part of the country, where the climate is more hospitable. |
Why are watches worn on the non-dominant hand? | This is a carryover from the days when watches were wound by hand. You would have to turn the crown on the watch to wind the spring. Sure you could take it off if worn on your non-dominant hand, but it was much more convenient to wind it while still wearing it, and it's much easier to do the winding action with the dom... |
How did leaders in the past give speeches to 1000's of people without a microphone? | Everybody is also forgetting simple megaphones. ", 'Relating what a history teacher told me They don’t. The people in the front can somewhat hear the speech, but other people can’t. Most of the time the ideas are conveyed through body language, motion and tone of voice. The example they provided was MLKs I have a dream... |
Why are bright or flashing lights dangerous to people with epilepsy? | They're not dangerous per se. They induce seizures which can be dangerous but need not be. My son is epileptic and the doctors sometimes try to induce seizures in a controlled setting using strobe lights. |
How does the political system of USA works ? | Ok, I'll try. We have 3 branches of government: the Legislative , the Executive , and the Judicial . Basically, the Legislative write, vote on, and pass laws. The Executive then approves and enforces these laws. If these laws are challenged in court, the Judicial determines if the law is in keeping with the Constitutio... |
If a young child falls into a coma and then wakes up much later (say 20 years), do they think like a child or do they think like an adult? | I wouldn't think so. Neuro pathways are made through experiences, socialization and practice. They wouldn't wake up worried about taxes and politics. They'd might still need to learn to tie their shoes or long division. They would be a child in an adult body. As such, their brains may be stuck that way, since the brain... |
How do doctors test for allergies? How do they determine specific chemicals or substances that cause allergies? | The most common method is the prick test. They apply a dab of a substance on your skin and prick the skin with a needle. If your skin reacts you're allergic. They often test 20 or more substances at a time. |
why are bananas such a common fruit? | Because of large scale monoculture the price is low. They can be picked unripe and then transported cheaply and ripened on the way. The skin is a decent wrapper which aids long distance transport. It is easily consumed since you just peel it - never underestimate the importance of this factor. The more fiddly it is the... |
Do pinhole glasses improve your vision? | Pinhole glasses does improve vision for near sightedness. In fact, it's used as a test for near sightedness as a refractive disorder of vision. Though it will not improve your vision over time. Most near sightedness is a problem with the shape or length of the eyeball, and pinholes aren't going to improve that over tim... |
how do eggs work?? | Someone's already answered the question, so I'll just add: have you ever cracked an egg to find a half formed bird inside? If not google it. |
Why is East Germany poorer than West Germany, even 30 years after the German reunification? | 30 years isn't exactly enough for a community to bounce back after oppression and poverty. Just look at black neighborhoods in America.Similarly, why are the Southern US States poorer than the Northern States? |
Why does your ring finger move when you flex your pinky finger? | There are better answers elsewhere in this thread, but basically they're controlled by the same string. Here's a quick little experiment. Rest your hand flat on a surface, and bend your middle finger underneath your hand. In turn, try lifting your thumb. Easy, right? Now lift your index finger. No problem. Then lift yo... |
How does the birthday paradox work? | If a 20-sided die were rolled to get a number, how many additional rolls would have to be made before that number was rolled again it would be about 10 additional rolls on average. But if the 20-side die were rolled multiple times, and each time the number was written down, how many rolls would have to be made before a... |
Why do phones/computers/TVs need to have a glass screen? What would happen without one? | The imaging technology, be it liquid crystal or AMOLED or anything else, needs to be secured in place. Without the screen, the liquid crystal would basically spill out, or LED array fall out of the phone. It's the same reason why a fishtank is glass on all sides: to keep the water inside. Why glass, then? Well, you nee... |
What happens to lost or abandoned nukes? | They'll corrode. That's about it. There's 0 chance they'll detonate. Detonation of nuclear weapons requires a number of extremely precise things to happen at once. It's really hard to detonate one by accident, and impossible for one to spontaneously detonate. There could be some local radioactive contamination dependin... |
If alcohol is very effective when it comes to killing germs and bacterias, why isn’t it effective to fight a bacterial throat infection by gargling with a alcohol? | Alcohol is very effective at killing bacteria, but it needs to have the right concentration: Around 70% or so, I'm not sure how much exactly. Less than that is going to be less effective. In addition to that, bacteria often form a protective layer of slime of some sort to protect themselves from things like alcohol. Li... |
Why can’t entire bones be transplanted? | This happens a lot. The most common one that you've probably heard of is the hip replacement. Edit: for the second part if your question, bone donation - like literally transplanting a bone from one person to another - is pointless due to the state of prosthetics |
Why do people brush their teeth before and not after breakfast? | It's a scientific reason. It dates back to who knows how long & the simple way to explain it is: because I'm a neanderthal with no culture", 'Habit perhaps? I honestly sometimes do it after |
How can we see HD media owing to the scientific fact that the human eye is only of 576 megapixels? | I think you're confusing 576 Mpx with 576p, thinking that 720p would be unrecognizable. 720p is the dimensions of 1280x720 pixels or 921,600 total pixels on a screen. 576 Mpx is 576 **mega**pixels or 576,000,000, so even if every human eye had a 576Mpx limit, it could still distinguish SD and HD quality easily. |
Why are political parties in America so polarized? | Because FUCK YOU! THAT'S WHY! In all seriousness, in a two party system with primaries, it's important to win the far reaches of your party, and the middle isn't politically viable. |
How do Satellites handle the millions if not billions of devices outfitted with GPS chips? | They don't. The GPS satellites just broadcast their time and position continuously and GPS devices on the ground can calculate their own position by comparing 3 or 4 of these signals. Most phones wouldn't be able to transmit a signal strong enough to reach the satellites anyway. |
what are the basics of losing weight ? | The basics? Burn more calories than you consume. Note that this is generally easier by consuming less calories, rather than burning more. It's easy to consume enough calories that burning them off becomes impractical.Simply eat less calories than your body needs. There are many websites out there which calculate the am... |
Why does hitting a flashlight when the batteries are low keep it working for a short time? | Electricity can jump a gap and continue on its way to complete the circuit . The stronger current, the larger the jump. So, you have fully charged batteries, and they aren't perfectly lined up, the flashlight will work without a problem. As the batteries loose charge, having them slightly out of alignment will cause th... |
Why do horses need horseshoes? | They don't. We need horseshoes to allow the horses to walk on surfaces they wouldn't naturally walk on. If we left the horses alone, they'd manage just fine without. |
How did the USA recover after the Civil War? | Good answers here about the post-war period. A couple things to add: 1) For googling purposes, this period of time is called the [Reconstruction Era.] 2) While the divisions in our country today have some of their roots in the Civil War, it's not exactly north vs south like it was then. The divide is more along the lin... |
Why do they say we share 98% of DNA with chimpanzee’s but then we only share 50% of our DNA with our mother/father/siblings? | Because of popular science journalists butchering the findings of actual scientific studies. If you take the DNA of a human, the DNA of a chimpanzee, throw away all the DNA that is clearly different between the two species, and only look at the DNA that code for stuff like the proteins used for vision and muscles, or w... |
Why is it if you put helium in a balloon it floats but put it in a tank it gets heavier? | I'm unsure about your wording. You're saying the tank gets heavier right? Not the balloon? & #x200B; If you mean the tank gets heavier, as long as the tank was holding regular atmospheric air, and you didn't remove any of it to add the balloon, you still increase its mass. Helium rises because it's less dense than sea ... |
Why are some public positions voted on while others are appointed or hired? | The rules of government. That position of coroner is in your county's laws to be elected, not appointed. |
What prevents an employer from "firing" you if you want to resign? | Theoretically, but then you could just claim you quit. Or you could claim severance because they didnt have reason to fire you. Either way that's real dumb and they wouldn't do that. |
The difference between agonists, partial agonists, inverse agonists and antagonists | Agonists = Car is on Drive and you are driving 20-30mphAgonists = Car is on Drive, you're flooring it at max speed 150mph+Antagonists = Car is in Park.Inverse agonists = Car is in Reverse. Basically, agonists bind to the receptor and cause them to do X. Partial agonists cause a slight effect, but have less potency/affi... |
Why do airlines have ashtrays in the toilets when you can’t smoke ? | People seem to forget, but I could smoke on airplanes as late as the year 2000. I did a random Google search for 'most successful commercial aircrafts' and [this link] popped up. The latest aircraft on the top 3 listed aircrafts came into active service in 1995. While smoking may have been banned in Europe and North Am... |
If someone is getting rich, someone else should be getting poor? | If you're making 5000 a month as salary, then yes, your company is losing that 5000. But they're making it back, and more, by selling stuff to customers at a profit. And then, after a few years, the company does really well, so the founders sell it for $1m, even though it only cost $100,000 to set up. So $0.9m of new w... |
Why do our bodies need to get taller from infancy vs staying small and just getting stronger? | Size is super complicated: 1st you've got physics. Heat dispersion is a big one - to be able to run long distances and disperse heat, but also retain heat while not being active. Once you start messing with our size, you will have to adjust other factors, and that would have gotten rid of one of our biggest evolutionar... |
how do socks prevent our feet from getting sweaty | socks don't prevent the feet from getting sweaty, but prevents feet from *feeling* sweaty since the fabric absorbs the sweat away from the skin. |
in the english language, why do the vast majority of swear words have something to do with a bodily function or are sexual in nature? | jävlar" and "helvete". The first three are names for the Christian devil, the last means hell. Words become swear words because they're taboo. This is really interesting when it comes to Swedish because at least about 85% of the population don't identify as Christians. So there is an effect of them being taboo at some ... |
why does your body wait with sweating until you’re done moving sometimes? | It doesn't. When you move the wind is blowing and it causes the sweat to evaporate and to cool you down. When you stop moving you don't get as much evaporation so you don't cool down as much so you then sweat more because you are hot. You were still sweating before, though. |
What is so great about being a senator/ congressman that people will basically sell their soul to keep or obtain this job? | Lots of sweet benefits. I can't remember the politician's name but a year or so ago he got into a huge scandal and was asked to step down. He refused and it turned into this giant issue and it was discovered that he was very close to getting free healthcare for life. He was only staying and dealing with the firestorm f... |
How did Google Chrome become so popular? | Internet Explorer back then was absolutely horrible. It was really insecure and many websites didn't even work with it correctly so you pretty much had to use another browser. When Chrome came out it was much faster than Firefox and had many new features so a lot of people switched over. |
Does the 22nd Amendment allow a President that served to terms to be elected as Vice President? And could he replace the President? | If you think about it, no president has ever taken a job afterwards. It's the highest office in the land . It's not likely they would take a lesser position anyways once one has held the top spot. Presidents might sit on a corporate or charitable board, do the public speaking thing, and act as diplomats . I will add th... |
How are producers and actors in drug documentaries allowed to either posses, partake, and/or film something illegal? | They don't really have any protection, but it's not really good policy to prosecute in some of these cases because of the implications on freedom of speech/press. Reporting does absolutely contribute to and act as the catalyst for prosecution, but the priority of prosecuting drug users who appear in documentaries is li... |
Why is urine ok to drink even in an emergency, even though it is the concentrated waste material of body? Doesn't this make the body open to diseases? | The kidneys do not fully concentrate the urine during normal times. There is some 'free water' available for the kidneys to further extract if they need to. As you drink your urine the kidneys remove more and more of this free water until the urine is maximally concentrated. This takes a couple of days at which point, ... |
How do people get surprised and die in wildfires? | Not exactly an answer to your question, but not everyone has the ability to just up and leave. Some families are living paycheck to paycheck, and can't afford to leave every time a wildfire gets close to their house. Gas and housing elsewhere would get expensive fast, so their only option is to wait until it's guarante... |
Why does vodka get syrupy in the freezer while water stays the same viscosity until it freezes? | Viscosity refers to a fluid not wanting to move from one place to another very smoothly. This resistance to motion can be due to: 1) large molecules in the fluid getting tangled up and tripping over one another and 2) strong attractive forces between molecules that glue molecules together and prevent them from moving f... |
are external hardrives essentially bigger USB drives, or is there something that differentiates them | External hard-drives are just normal hard-drives connected via a different bus. If you pry open the case you will often find the regular internal hdds with their SATA connectors stuck in an SATA-2-USB connector that the cable to the computer plugs into. The actual drives are exactly the same, but instead of plugging in... |
how surveyors know where they're at on a property and where that property begins and ends? What points of reference do they use and how do they know theyre accurate? | Pre-measured reference points. Usually metal stakes driven into the ground. Measuring from these points gives them an accurate reference to how your property is located relative to the geomatics benchmarks. On the property map, it will list the reference points that the lines are measured from, IRC.It's been a while si... |
California specifically seems to always be in a drought, but surrounding states don't seem to have the same issues with fires. Why is that? | One thing that isn't getting brought up is how populated California is. A fire in some states can get to 100k acres and still be miles from any towns or cities. Where in California a much smaller fire can be right up against a town or a city very quickly. It makes them much more serious when peoples property and lives ... |
If we know the age & the rate of expansion of the Universe, why can't we calculate how big it actually is? | We know how big the observable universe is. We don't know how big the entire universe is because we cannot see it, and it may be infinite in extent. |
With how much the Earth has changed,would prehistoric creatures as we know them even be able to exist in today's environments,even in the best of conditions? | Most of them wouldn't just because the oxygen content. Too low for most insects and things like dinosaurs, too high for most things with just a few cells. I don't remember if plants or jellyfish are older, but older than that. |
Why is the production of iron atoms a sign that a star is dying? | Iron can't fuse inside a star into a heavier element. It then goes supernova soon after iron forms. Heavier elements are formed from collisions made at high speeds from the supernova |
Why do people answer with questions in Jeopardy? | That's the setup of the show. Trebek gives the answer, then the contestant have to figure out what the question was. |
How did mammals survive mass extinction 65 million years ago? | Quite a lot of them didn't. The extinction event wiped out species across the board. In fact pretty much any species of land animal that was larger than a medium sized dog became extinct during or shortly after the event. Mammals had the advantage of being overall smaller and more adaptable. It easy for something small... |
Why does it seem like more people get colds/flu during the colder months of the year than warmer months of the year? | I saw something about this on TV a good while back, so from memory: Some viruses have a kind of shell that hardens in colder temperatures, allowing them to survive longer outside the body. So in warm weather they don't last as long and don't spread as easily, but in cold weather they can be carried about further - on c... |
If the volume of blood in our body, as well as the space that blood has to occupy are both (fairly) unchanging, how can our blood pressure change? | Both the amount of blood and the volume of space it occupies can change. Typically for the purposes of measuring blood pressure, major factors are going to be the amount of blood the heart is pumping into your system, and the resistance of that system to the push. For instance, your blood vessels can dilate and constri... |
Why Macs don't get viruses and what makes PCs so prone to them? | It's about market share. There are just way more windows computers than macs. It makes for a better target. Not to mention just how their os is built makes it easier than Unix that mac is based on. Macs might not easily get traditional viruses that can take over a computer just because of some junk email, but macs can ... |
How can people tell when someone is staring at them? | Basically, there are two ways of thinking about this: 1) It's a phenomenon called recall bias. Basically what happens is that you know you have idly been looking at someone randomly in a public situation and made eye contact, and it was awkward, or whatever, so when you 'feel someone staring', you sub-consciously look ... |
What exactly are the potential consequences of spanking that researchers/pediatricians are warning us about? Why is getting spanked even once considered too much, and how does it affect development? | The simple but on-point answer is this: Humans are a monkey-see-monkey-do species. Our young learn from what we tell them, certainly; but they are **always** learning from what we do around them - and to them So, spank a child for disobeying? You think you are only teaching them to obey. But the deeper behavioral teach... |
Why are men so disinterested in sex once they've ejaculated? | After browsing the [wikipedia page for refractory period], it seems the cause is the release of hormones most commonly theorized to be oxytocin and prolactin. As for evolutionary theories as to why we have the refractory period, [here's] an ELI5 responder regarding why. TL:DR Women used to have sex with multiple men, y... |
How does plane overbooking occur? Why don’t the airlines stop selling tickets once the plane is full? | Planes want to fill every available seat they can. They know that on average there's a certain number of people that don't show up so they sell more tickets than seats. Sometimes they're right sometimes they're wrong. |
Where does a queen bee come from? How and with whom are they made since there is no king bee? | We call them queen but they serve the rest of the hive. The workers are the ones in charge. The queen is there only to ensure more sisters of the workers are born. She's a normal worker that gets a special diet when being formed, to become the reproductive organ of the hive. To accomplish this task, male drones are cre... |
Why are all the planets in the solar system on one two dimensional plane? | I don't know if this allowed here, but this video will likely give you a better understanding than any comment possible here: _URL_0_ |
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