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why submarines use nuclear power, but this isnt more commonly used on land? | Submarines benefit from not needing to refuel for long periods. This isn't nearly as important for land vehicles, especially since a land vehicle can stop anywhere, turn off, and consume no power whatsoever. A submarine can't do that. Also, designing an extremely heavy, large vehicle is much easier on water. Few land v... |
What is a Deja Vu? | 'Yossarian shook his head and explained that déjà vu was just a momentary infinitesimal lag in the operation of two coactive sensory nerve centers that commonly functioned simultaneously.' - Joseph Heller, *Catch - 22* |
Why do we sing in the shower ? | The environment of the average bathroom has all the sound you make bounce right back at you, which for recording isn't ideal but for acoustically singing to yourself can be atmospherically pleasing, so we enjoy hearing our own acoustics in there basically |
if the Japaneese knew about the nuclear bombs before the US dropped them on Hiroshima and Nagasaki, why didn't they surrender sooner? | The Japanese didn't know about the nuclear bombs, not really. They knew about the theoretical possibility and that the US was working towards it. But until the bombs were dropped, Japan had no idea exactly what the US had. Hell, the US didn't really know it, either. To look at it another way, what is more likely, you e... |
how does a fan cool down the air in a room | > Every time I feel hot in my room I stand in front of my fan to cool me down, but I don't know how it cools that air down. It doesn't cool the air down, **you are heating the air up!** The air right next to your skin is being heated by your body so if you push it away and replaced it with room-temperature air it seems... |
What is "mental exhaustion"? | When you use your brain, it gets tired faster. When you use your body, it gets tired faster. If you use your **brain** a lot more than your body, you have **mental exhaustion** when your body is perfectly fine to keep moving. If you use your **body** a lot more than your brain, you have **physical exhaustion** when you... |
Why do you need an "escape velocity" to leave earth's gravity? Since gravity is a force, shouldn't it be countered by an "escape force" and not velocity? | You aren't trying to stop gravity from working, you're just trying to reach a position where it has much less effect on you. The farther away you are from the source, the smaller the effect, but with a source the size of the Earth, you have to go very fast to get that far away before gravity pulls you back towards it.G... |
if gravity is gets weaker the further away you are from a large mass, why can't rockets leave the earth by just flying at a low constant speed? | Let's consider Earth's gravity as a hill and a rocket as a kid on a skateboard trying to go up the hill. If the kid just pushes once while heading towards the hill, he'll probably fall back down. If he pushes as hard as he can and then tries to coast up the hill, he'll get *closer*, but probably won't get all the way u... |
Why do we need to cook our meat before we eat it but wild animals are fine eating it raw? | We don't need to cook our food before eating it. We can digest raw meat of all types just fine. Cooking will kill parasites and make it easier to digest though, which is why we usually do so. |
Theoretically why can't objects go faster than the speed of light? | So, theoretically, nothing can go faster than the speed of light. It just happens that light goes as fast as possible, so it moves at that upper limit of speed. Why that is the absolute speed limit of the universe is a deeper question. However, as other have said, Newton's second law is wrong, but usually you don't fin... |
Why are most Western Languages written using a common alphabet but more Eastern/African alphabets written using different sets of symbols? | Europe used to have a bunch of different writing systems and the Latin script and its modified descendants eventually replaced them not because of the Roman empire but rather because of the spread of Christianity. Romance, Germanic, Western Slavic, and some others all eventually adopted the Latin script because of Chri... |
How can the universe be both "infinite" and "expanding"? | The universe *may* be infinite, but it also may not be. At this point we're reasonably certain it's infinite. If it is, then what is happening is not the universe expanding, but rather, the space between objects in the universe is growing larger and larger over time. The whole universe will always be infinite regardles... |
Why does Pi have infinite digits? | Take a _URL_1_ has a radius,which is the distance between the center of the circle and the line of the figure itself.There is a relationship between them,right?The bigger the radius,the bigger the length of the line which creates the circle,and vice versa.Now we want to find out what is this relationship between the tw... |
Why are the 7 continents when Europe and Asia are basically the same land mass? | > Why are the 7 continents when Europe and Asia are basically the same land mass? Firstly, you have assumed there are 7 continents, but that is only one model. [Different models propose anything from 4 to 7 continents]. Secondly, a continent is not defined by whether or not it is the same landmass. Europe and Asia bein... |
What is the benefit to a company to enact a policy that prohibits promotion of employees from within? | A lot of it depends on the position that is open for those internal candidates to apply for. In some cases, institutional or company knowledge will have just as much impact on potential success as education or prior experience in the higher level position. In other cases, that institutional knowledge may not make up fo... |
What would happen if we detonated an atomic bomb in the eye of a hurricane? | A hurricane gets its energy from warm ocean water, and in the process of water vapor condensing into rain droplets. The heat released during condensation serves to continue to warm the surrounding air, which causes more seawater to evaporate, condense, and continue the cycle. A fully developed hurricane releases 50 or ... |
When planets are visible from earth, why do they appear as stars to us on the surface of earth? | Well, they do appear a *bit* different. For example, planets don't twinkle. Other than that, there's not much else which you can discern with your plain eye, so it makes sense for planets to look the same as stars. |
How do we know numbers like Pi are infinite rather than just incredibly long? | Thee simple answer is that we have an incredibly complicated proof that requires more math than any average person would posses that tell us so. I think it a good question though. If a number didn't start repeating digits til the trillionth digit how would we know? The answer is almost always complicated math. |
Why is heroin and meth so addicting? | It alters the pleasure centers in your brain. Over time your body builds a tolerance so you'd need more of it or do it more often to get the same high. |
why does the existence of wormholes automatically make time travel possible? | Not an expert, but I think it has to do with the amount of distance you would travel in a short amount of time. If you travel through a wormhole to a very distant place, you would be traveling from point A to point B way faster than the speed of light. Time wouldn't be able to keep with the that and you would be travel... |
How can photons actually be massless? | The are massless in that they don't have a rest mass . But they have a relativistic mass. The famous E=mc^2 is true if the particle are at rest If it moves it has a momentum and the equation is:E^2 =^2 + ^2 The momentum of a photon is p=h/λ where h is Planck's constant and λ is the wavelengthSo it has a relativistic ma... |
Why does a planet that is very close to its star (or a moon to its planet) often becomes tidally locked ? | The Earth is 7900 miles across and the moon is 238900 miles away. For the earth to rotate, a spot on the equator has to move 7900 miles further away from the moon. This takes energy to do, so the Moon's presence near earth means that it's always trying to slow down the half of the Earth that's rotating away from it and... |
How do you play Dungeons and Dragons | Think of it as an interactive story told by the DM rather than a game. You build a character, you're responsible for that character and its story in the story world of the DM. |
What IS Autism?? | Here's some food for thought. The brain is not simply a computer in some respects. The way in which memories and emotions and skills develop is due in part to where in the brain that particular memory or whatever it is is located. Have you ever wondered why perfume and aftershave are so popular? It's because emotional ... |
How binary code works? | It's the simplest form of code, using 1s and 0s to turn a switch on or off. Every computer uses binary at base level. |
why is the speed of light the universal speed limit, and not just the fastest thing we've been able to observe? | Because of math. Einstein's equations show that your mass increases as you go faster. At the speed of light your mass would be infinite . Since there's nothing more than infinity then that has to be the limit. How do you increase your mass beyond infinity? You can't. |
When something surpasses the speed of sound why does it create a sonic boom, and would it be possible for an object to avoid creating a sonic boom? | Imagine driving your car at the speed of light and turning on the headlights. What happens? The light can't go any faster, so it all balls up on the headlights. Sound does the same thing. It can't travel through air faster than the speed of sound, so if you're making noise at the speed of sound, it all bunches together... |
How does the higher education system in the US work? | College of Business Administration", etc. Community College: A smaller College that offers fewer total classes, and generally only offers Associate Degrees and possibly one or two Bachelor's degrees. These are primarily used by working adults to get additional education, and by people who were not academically gifted e... |
Why is internet Explorer hated so much | Recently, Internet Explorer's been a bit decent again. However, old versions of it were infamous for being very slow, especially compared to alternatives like Chrome and Firefox, and for breaking many websites.IE was notorious for accepting badly formed HTML, and allowing ActiveX controls to run, both of which were maj... |
On Saturn's moon Titan, the gravity is low enough and the atmosphere thick enough, that by attaching small wings to your arms, you could fly like a bird. | Flight is a matter of balance. Gravity's always pulling you down, and if you want to stay up, you need to generate enough lift to balance it out. Where does that lift come from? Birds' wings are shaped so that air on top has to travel further than air on bottom to go around it . That means air on top of the wing is tra... |
If an alien probe with similar dimensions and operational capability of the Pioneer or Voyager spacecraft passed through our solar system, would we detect it? | It's possible but there are some caveats. The farther away you are from a source of light or radio waves, the lower their intensity will be. So something twice as far away from you, will only be 1/4 as intense . In order for us to talk to our own probes we have to combat this loss of signal over long distances by using... |
How can we know that the observable universe is 46.1 billion light years in radius, when the furthest object we can see is 13.3 billion light years away? | I honestly don't fully grasp this but I'm still trying.. But I recommend learning about Einstein's relativity. A book or audiobook. |
What’s the difference between an embassy and a consulate? | I'm going to use my situation as an example here: Canada has their embassy in Washington DC, which handles all of the official gov't-to-gov't business. They also have a Visa Office that handles all of the minor citizen level stuff: Visas, Passports, etc. There are also Consulates in Atlanta, Boston, Chicago, Dallas, De... |
Difference between lobbying and bribing? | There is a huge misconception that lobbying is just bribery. In reality lobbying is much broader. If you ring up your representative, you are lobbying. If you present a report to a representative, you are lobbying. Basically any contact with MP's/Senators for political purposes constitutes lobbying. The democratic proc... |
what is a reverse mortgage | Worst part about them is that since you are not making a payment, you are not paying interest, so the interest compounds on itself. Over and over, snowballing until the end. If nobody is inheriting the house, then it doesn't really matter. |
Is the universe actually infinite, or does it just go beyond our current observational capabilities? | The only real answer is: No one knows. As far as we can see it's infinite, there seems to be no sign of it ending or changing in any direction. But there is no way we can know that for sure right now.We will never see beyond the distance we currently can as the universe is expanding faster than the light from beyond th... |
how can the universe be finite? If it has a putter boundary, doesn’t there have to be something (even empty space) beyond it? | Ah the old what's beyond our observable universe question. Simple answer is no one knows if it's finite or infinite or whatever. It's pure speculation. |
Why is a small amount of inflation considered good for the economy? | Small amounts of inflation encourage spending and investment. If you're money becomes more valuable over time , then why buy a house/TV/Car now, when you're dollar will be worth more next year? Or why take your money out of the bank and invest it? You're basically able to make money by just burying cash in your backyar... |
What happens in our body that makes our bones make a popping sound when we “crack” our knuckles, back, neck etc..? | No one knows for certain. One theory is called cavitation. Where compression of a fluid causes gasses in the fluid to become bubbles. Those bubbles then rapidly go back into solution once the pressure decreases. This is why on a boat propeller you see bubbles around to propeller when you move fast enough The idea is th... |
Why do police still use horses? | They handle terrain, can jump obstacles, fit easily through crowds, and provide a height advantage. Also people are afraid/respectful of horses, and in the rare instance they get attacked they'll be trained to rear and strike. |
If you have two objects moving at the same speed, the one further away appears to be moving slower than the one which is closer. Why? | Things that travel the same speed go the same distance in the same amount of time. When things are far away, very large distances look small. So even though both cars are going the same distance in the same time, the one farther away doesn't look like it moved very much which makes it seem slower. |
Why is the reversible, and compact design of USB-C only made recently? Why couldn't they have used this design decades ago when they were designing USB-A? | USB in and of itself is an attempt to condense parallel communications into a serial interface. When USB was designed, they condensed 8 pins to 4. I am not trying to say the original RS232 port was parallel, it was serial; but the logic to achieve the same ability with fewer pins was one of the main priorities when USB... |
How do life insurance companies make money | 1. They invest your premiums and make money on those for years before having to ever pay out. 2. Many people get Term Life insurance, and those are not permanent, so if the term expires and you didn't die, then the company gets to pocket the premiums you've paid into it. 3. Many people may cancel coverage due to the co... |
What does it mean when we say the universe is expanding? | We don't know what it is expanding into but all our findings indicate that everything is moving away from each other and at an increasing speed. If everything is moving away from each other then that is why we call it expanding. On another thread someone used the image of a balloon being blown up. If you are on the sur... |
Light is the fastest thing in the universe but WHY does light travel/move at all? | One way to consider this is to think of light as *information* and the current arrangement of the universe as *state*. If information doesn't travel, then state never changes. If information travels instantaneously, then all possible events happen simultaneously. In both cases, you no longer have any reasonable definit... |
Why don’t we milk pigs? | Mainly because they don't produce enough to justify the effort. Sheep's milk is available in some places as well, but it tends to be more expensive than the alternatives because of the effort involved in getting enough of it to market. |
Why do some soldiers guard Grand Central Station and The Oculus for example, and others are deployed overseas? How is this decided? | While I don't personally have experience in the military, I have a few family members who have served and a younger cousin active in the Marines. My understanding is that you don't get to pick where you get deployed, so these kind of assigents are very difficult to get. While someone would be pretty lucky to get this k... |
Why are standard golf balls white instead of a more vibrant color that's easier to see? | I've heard that white is the easiest to spot. Unless it's in snow of course. A survival guy on his show tore the white foam out of his neon orange life jacket to use as a signal for help for this reason", 'A lot of the bright ones are harder to find. Bought a sleeve of neon yellow the other day and lost them all on dec... |
Organ transplants- needing a donor match, but you still need life-long immunosuppressants. What exactly does a donor match entail then? | If you have a closer match, then you'll probably have fewer problems with rejection. Like if you have incompatible blood types, then many problems will arise immediately and you'll have organ failure very quickly. If you match on some protein markers, you may have a better time than people who match on no protein marke... |
Why can hot things of any kind get colder than room temperature? | Food contains water - when the water evaporates, it cools the food. This will happen so long as the relative humidity in the room is not 100%: any moist surface will be cooled to below room temperature. Edit to add: An example would be the temperature difference between a [wet bulb thermometer] and a dry bulb thermomet... |
How does a casset to auxiliary adapter work? | The cassette adapter replicates the magnetic strip of cassettes by transmitting the mag strip's signal to the cassette player's head. If it helps, imagine how your phone transmits sound to your ears through your headphones, but in this case your ears are the cassette reader. |
Why are we told to only put Deoderant on our armpits, when our entire body sweats. | There is apocrine and eccrine sweat glands. Eccrine glands are on most of your body. Armpits have apocrine glands. When you hit puberty your armpit sweat glands become active. The difference in what apocrine glands emit causes the bacteria in your armpit to give off a smell. Eccrine glands don't really smell. |
Why do racing bicycles have ultra thin tyres to make them faster, but the fastest motorbikes have very wide tyres? | On bicycles: less rubber on tyres make them lighter, which means they are more energy efficient. On motorcycles: energy efficiency isn't really a problem, so they have very wide tires to get a larger surface area for grip, wider tires are also better for proper cornering, like full on laying into the corner a few cms f... |
How come when humans touch power lines, they instantly get electrocuted, but when pigeons and other birds rest on power lines, nothing happens? | When a bird lands on a power line it doesn't get electrocuted because it is not touching the ground, electricity wants to go to the ground so when humans touch it their bodies are perfect conductors since we are 70% water |
During WW2 why didn't the Allies replicate the MG42 when it was superior to their variants of machine guns | The mg42 on its own was a very good gun. If you wanted to put large quantities of bullets down range, then the mg42 is probably the best gun for that at the time. The problems with the mg42 are largely logistical in nature. First the things are not accurate at all. This is fine if your fighting a defensive war, but spo... |
When metal rusts, does that mean we can never use it again? Could we completely run out of metal? | Iron we mine and turn in to metal is Iron oxide. It takes tons of energy to to remove to turn iron oxide to iron. There is a ton of stored energy in the Iron and it wants to react with the oxygen in the air to turn back to rust. odd factoid- metal only rust or oxidizes on earth due to its oxygen in the air. The oxide l... |
How come American football kickers can 70+ yards on kickoff but only around 50 yards on a field goal. The holder can’t make that much of a difference can it? | This isn't really a physics thing. It has to do with the rules of the game. A field goal actually has to make it 10 feet off the ground to count . That's where the extra difference goes. A kickoff/punt can hit the ground, bounce and the extra distance will still count. The holders/tees have nothing to do with it. If a ... |
If water is a incompressible fluid why does pressure increase when going under water? Wouldn’t the pressure stay the same since the density of the water doesn’t change? | Let's imagine you lay down on the ground. I put a bucket on your chest and start filling it with water. You will feel the weight of the water pushing down on your chest. That force/pressure of the water pushing down on you has nothing to do with the compressibility of the water and everything to do with its weight. It'... |
Why do couriers in the USA leave package in front of the door? | When I lived in a big city, the mailman had a key to get in to the lobby of the building and put stuff in our mailboxes, or leave a package on the floor. UPS, FedEx, and DHL did not get those keys, so they'd leave packages on the sidewalk if they couldn't get someone to let them in. One of my packages was stolen . Afte... |
Why do radio stations have to play the same 30 songs, day in and day out? | It's called commercial music because it has been approved for commercial use. You've got all kinds of people listening, different religions, different ages. To keep it simple, you have to try to keep everybody happy and commercial songs are a good way to stay safe. |
Why do humans' teeth rot and fall out if they aren't brushed, but animals' teeth can do okay without being brushed? | The majority of our modern day tooth decay issues stem from the ludicrous amounts of processed sugars in our foods . Most animal feeds don't have these, so less of an issue. Also cultures which likewise don't have a lot of processed sugars or sweets tend to not have as many dental problems either. By all measures I'm t... |
Why do printers use cyan instead of blue? | The actual color spectrum goes from ~350 nm to ~750 nm. However, the way you see is via 'cones' that have their maximum gain at center wavelengths ~475, ~550, ~700 . So if I shine a light with a wavelength of ~515, you're actually seeing a dim blue light at the same time you see a dim green light - and you interpolate ... |
Why are window air conditioners generally noisy, while indoor cooling systems like central air so quiet? | 1. AC units for central air are still pretty noisy. 2. The larger the fan blade, the slower it needs to rotate to move the same amount of air. A window unit can only have a blade so large. The faster it spins, the more noise it and the motor driving it are going to make. Also, your A/C unit outside is simply using its ... |
if temperature is a measurement of how much motion particles have shouldn't a fan make it hoter instead of colder? | Temperature is about the local motion of the particles and the energy released as they bang into each other -- think vibration. Air is made up of gasses, which are particles spaced widely apart. As gas molecules get more energetic, they move further apart due to their lower mass. As such, the air actually does warm up ... |
Why are US voting machines is so vulnerable? | They're made by the lowest bidder. The lowest bidder then turned around and hired the cheapest programmers he could find. Those programmes did the bare minimum to not get fired.It is very, very difficult to get software right, unless you paid a lot of money for it Relevant XKCD: _URL_0_ |
The mechanisms of voting in the US and the controversy about requiring government ID in order to vote | Other people are saying it in more detail, but in essence the root of the problem is that actually getting appropriate ID in America is *unspeakably* difficult compared to in most other first-world nations. |
Why does science show that we sleep better in a cold room, but during the day when are awake a cold room is used to keep people awake and alert? | I could be very wrong but I always thought they set temps lower cuz it's easier to add a layer than remove one. Hadn't even occurred to me it was done for productivity |
Why is it so many languages have some form of "mama" and "papa" as one of their words for mother and father? | bababababa", and "papapapa". This is the main reason mama and papa are so preserved globally as labels for parents. This is according to the developmental pediatrician I worked with. |
Why is Malcolm X so celebrated? Wasn't he a racist? | This is probably too big a subject for an ELI5, but the TL;DR is: He was a person who was willing to make enemies and die for a cause, and the cause was just, even if in the process of promoting the cause he sold his soul. The cause was policing the police, for ALL people. The Black Panther movement isn't exactly what ... |
What is the difference between credit cards systems in U.S.A and Europe? | Even in Europe there is a difference. In Denmark, the DanCard combined with a Visa is very frequently used. By law, there can be no transaction fees and every store accepts it. I can't remember any time in the last 5+ years I've carried cash in my wallet. We also have Mastercard and others, but the most common is the d... |
Does Ginger Ale and Saltines really help an upset stomach? | If you have a stomach bug, carbonated drinks and saltines won't really do much, since the vomiting is caused by the bug/virus. On top of that, you wouldn't even be able to keep them down, anything you ate or drank you'd just throw up again. It's more for when you feel sick from eating too much or something more minor l... |
How do spiders know where to build their webs? | Just heard this topic on coast to coast am radio program two nights ago. A specialist that deals with gravity stated and he may be a whack job but he stated that a spider sends out a stringer and it detects gravity waves and pulses by feeling that stringer and knows which way to go. He brought up a study that nasa did ... |
How does tap water come out cold? | It isn't really cold, it's usually right around room temperature. However, room-temperature water feels colder than room-temperature air because a liter of water has a much higher heat capacity and heat transfer coefficient than a liter of air does. In other words, water wicks heat away from your skin faster than air a... |
Why do so many game devs tie physics and other calculations to frame rate? | You're kind of misunderstanding the issue.Devs don't do it on purpose necessarily to mess with gamers, but it's something that can be remedied with properly planned programming. So let me explain it as simply as I can without too much game dev garble. When programming anything, the speed of the program is automatically... |
How can satellites and spacecrafts be launched just later than planned like it's no biggie? | I think the key is calculating trajectories for numerous launch days . When you are running a multimillion dollar operation, it would be kinda ridiculous to not plan for something as simple as a cloudy day. On a slightly off topic note, if you read the book The Martian , there is one brief part where a character discus... |
Things become slippery when wet, so why is water not used as a lubricant? | AFAIK what makes streets and surfaces slippery when they get wet is the accumulated grime together with the water. When that is washed off, the street is far less slippery. The other thing about lubrication is film strength. A lubricant keeps two surfaces apart and allows for relative movement without much friction. Wa... |
Why can gas prices be so different between two stations? | The price gas stations pay to get the gas changes over time. Not all gas stations order at the same time. The price you pay reflects the price they paid AT the time they purchased their gas. Also could be a loss leader. Gas stations can make their gas cheap and lose money, in hopes to get you to come inside and buy stu... |
Why did we start with generation X, Y, Z instead of A, B, C? | the silent generation", etc. "Generation Y" was originally kind of a joke on "Generation X", combined with "why", but it stuck, although "Millennials" seems to be the more common name now. "Generation Z" is an obvious follow-up, but they're only just now starting to reach the point where they're old enough to have thei... |
Why can you see reflections better off of darker surfaces if dark colors are supposed to absorb light? | A lighter surface reflects everything, making it hard it distinguish objects from other light that is reflected. The reflecting of light on dark surfaces happens only because the surface is smooth against a dark background, it's easier to discern the reflection. |
How is it that a photon doesn't experience time or distance, yet it (to my understanding) moves through both? | Only from our frame of reference has the photon been traveling for 8 minutes. Because of the effects of time dilation, the faster an object moves through space, the slower it moves through time. A crazy example is that if you were to travel at 99% the speed of light to our nearest star at 4 lightyears away, you could g... |
When Ravens were used to send messages how did they know where to go? | Homing pigeons are selected and trained to always fly home. For what it's worth, here's a picture from World War One showing a guy carrying a few birds: _URL_0_ |
We get the internet from ISPs(Internet Service Providers). But how do they get it? (Or how does it work)? | Mmmm ok, your question caught my eye and I guess I just found a video for you: [https://www._URL_8_/watch?v=IrGMPdseXxI] Look, imagine yourself watching a YT video, then imagine there's this thick, fat, cable going around the world. There are plenty, thousands of them all around the world, and they are buried undergrou... |
Why is there so much water on earth? Where did it all come from? | Hydrogen: most abundant element in the universe Oxygen: third most abundant element in the universe [Source] The question is not why there is so much, but why isn't there more |
why does Canada import and export oil at the same time? | Couple different reasons. Canada is a very, very big country geographically. Over 90% of Canada's oil is produced in the western prairies . The vast majority of Canada's oil importation occurs on the eastern coast. Tankers are a very cheap method of transportation, so it does make financial sense to actually import it ... |
What is the practical help to use of having a map of the human genome if everyon's DNA is different? | Your eye color gene might be different than someone else's but both of your eye color genes are in the same place. Think of it like a big row of switches and dials. They might all be set to different things for different people, but knowing the genome tells us what those switches do, regardless of what they're set to. ... |
How does the “cutting” process work for movies/TV shows? Is it simply the scenes the director doesn’t like that are cut? | Sometimes a scene will be filmed several times, and the best parts are edited together to form the best possible scene. When you have a scene where you switch back and force between camera angles, it almost always was filmed at least twice. Special effects will also require multiple shots, in *Lord of the Rings*, anyth... |
Why do credit cards have a verification code? Why not just make them 3-4 figures longer and treat the last few digits as a verification code with the rest of the card number? | There actually at least two verification codes. There's the one you see, for phone/online orders . The magnetic stripe contains another one for swipe purchases they invented cards where the verification code on the back changes every hour, so even if someone takes a picture of the card info or writes it down, they can'... |
Why is it that sometimes even after sleeping for a decent amount of hours, i still wake up feeling exhausted? | First, try to isolate & identify the conditions around when you wake up exhausted, including difference in sleep times, activity level during the day, etc. It's possible you have sleep apnea as that's a primary symptom. Other factors may also play a role, since you say it's only sometimes this happens. Either way, it's... |
what makes general anesthesia safe? | It's pretty dangerous. That's why there is one doctor whose job is it to just sit there and monitor your vitals and ensure that you keep breathing. |
Why are video-game fan art commissions sold for money not affected by copyright issues? | Companies care about their IP because it will make them money. They will permit infringements in their IP and turn a blind eye if they think the infringement will make them money. For example no one sells fan art of their video game characters. They might however sell action figures and plushies . Two big examples. You... |
What causes loading bars to get stuck or slow way down near completion? Is it that developers put the hardest things to load at the end of the progress so impatient users stick around? | Basically loading bars aren't accurate cause it takes a lot of effort to make them accurate and no one is paying for that. So what you get is a best effort approach. Like maybe you are installing 4 gigs worth of data, and just count the bytes. that's reasonably accurate, except when you near the end, and you are done w... |
How does Adblock work, does it alter something in your browser? | If you think about how a web page works, it's essentially a text file that includes a basic structure, content, and references to other files such as scripts, images, or other multimedia content. Those references effectively ask your browser to go fetch an extra file and add it to the final displayed result. Some of th... |
How do they remaster old tv shows in HD? | Old old shows weren't captured in TV quality . They're captured in high film quality, then produced downgraded to TV quality so it could be broadcasted at then- SD TV quality. To make these shows HD, all you do is go back to the original high film quality and scan them in as HD. Newer old shows like 80's we're captured... |
How do people who crack games get said games to crack ? | Indeed they don't have access to the source files. They have to work with the released binary EXE file as it is. To help crack they typically use a debugger application to step through the raw CPU instructions while the program is running, then editing the file once they find the exact location of DRM check. It could e... |
Why do older vehicles have a blue stripe across the top of the front windshield, but newer vehicles don't? | It's a shade band - a strip of tinted glass to aid drivers driving into the sun. It helps cut down glare and REALLY helps if you can position the tint between you and the traffic light above you to see the lights change when the Sun is practically blinding you. |
How are glitches/exploits/secrets found in video games, surely people don't spend hours and hours trying to find them with only a small chance there's actually something to find? | You should look up the history of Mario Bros. level 2 speed runs. It's insane the *years* invested by people who stumbled upon and sought after glitches that would cut the time down. There are teams that make mods for games. Historically, this wasn't always an ethical practice, as some mods are meant to cheat. For exam... |
How does an ice cream maker work? | The air argument is not correct. It is the formation of specific forms of ice crystals in the mix that give its texture. The constant churning is what enables this. If you don't churn it while freezing, you get large chunks of ice forming. Not very smooth. _URL_0_ > ABSTRACT: The smoothness and perceived quality of an ... |
What is “Ray Tracing” and how does it work? | [This video] is a comparison of the 3D software Blender's two core render engines, one is a real-time render engine. Basically how all games work today, it's quick but takes a lot of shortcuts. The other engine is the Ray-Tracing engine, used for super high quality rendering but is currently almost impossible to get lo... |
What is a security clearance? | It's having the authority to view Top Secret and Classified, etc. documents, intelligence reports and so on. It's obviously an important thing for high level government jobs, but it is also necessary for other top private sector jobs that work with the government -- common landing places for people after their governme... |
how is induction cooking different than a typical electric stove top? Don’t they both just send an electric current to create heat? | In an electric stove, an electric current passes through the coils, generating heat. This heat is conducted into the bottom of your pan, then from the bottom of the pan up through to the top of your pan, and then into your food. In an induction stove, a changing magnetic field is generated by the stove, which causes an... |
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