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Why do airplane ticket prices for a flight at a certain time and day fluctuate so much? | Our basic view of goods/services tends to be based on individual units. Everything requires a certain amount of resources - both in terms of components and labor - to produce, so the minimum price that can be charged is the value of those components and labor. Charge less than that and you'll lose money. However, a fai... |
why is being addicted to methadone seen as a healthier alternative to being addicted to narcotics ? | 1. Heroin needs to be taken every 6 hours, Methadone lasts 24-36 hours. 2. Heroin isn't cheap. I've heard of people with $300-600+ per day habit. Methadone is covered. 3. The stability that comes with both of those. A $300/day habit that you need to redose every 6 hours is not conducive to having a job or having money ... |
Why does windows instantly verify a correct password on startup but take a few moments when my attempt was incorrect. | AAAAD", and so on, though all the colossal number of possibilities, expecting to eventually hit on your password and gain entry into your account. There's no intelligence used to first try the most likely password . That's why it's called a "brute force" method. It will take many thousands of attempts before the softwa... |
How come mammals other than humans don't get periods? Or do they? | I used to have a pet pot belly pig that would get a pretty legit case of PMS on her period which happened every 2 weeks. You just didn't want to be around her until it passed.Great question! They do. They also clean themselves differently than we do. I have goats and pigs and they definitely go into heat in cyclesTo ad... |
What is happening when my phone displays that it has full 4G signal, but it clearly doesn't because it can't load anything? | It can have a full 4g connection and still have that connection be very slow. The signal is the strength of the connection between your phone and the towers, not the strength of your internet connection. The 2 aren't necessarily the same, even though they usually seem to be.You could have 4 bars of strength, but if tha... |
Why do humans respond to rhythm/music? | I read something about it a while ago, in uni. The video does a good job of explaining it, in a way. Every human activity produces noises. Coordinated and/or repetitive activity produces rhythms. A regular rhythm is a good, efficient way to, well, regulate the activity. Look at the boys hammering down on metal. Their c... |
Why do smooth surfaces that are wet or dry have little friction, but a surface where the water has almost evaporated tends to catch things with increased friction? Like a wood or glass table. | Okay, so most friction comes down to interactions at between atoms at the molecular level. Water is a very special chemical due to its shape: the two hydrogen atoms tend to group together on one side of the oxygen, like Mickey Mouse ears. Due to the way the electrons in water are interacting inside the molecule, the si... |
How do we know counting rings in a tree is a definitive "1 year"? | If you have a look at a stump you'll see thick bands of a light shade where the tree got bigger fairly rapidly during the warmer months followed by thinner darker bands where it didnt really grow much in the winter. It makes the same pattern every year because the seasons are predictable. Some bands will be thicker whe... |
why lenses with aperture less than *f/1.0* existed but not *f/1.0* itself? | I think you are confused or the article wasn't very accurate. F-numbers like f/1.0 are not special in any way despite the fact that the size of the lens is relatively large due to large aperture. As you mentioned - there are existing lenses with any reasonable f-numbers like below or above f/1.0 and including f/1.0. Ma... |
What's the difference between symptoms of the common cold, and symptoms of the inflammation my body is producing to fight the virus attempting to cause the common cold? | The immediate symptoms are primarily caused by your immune system trying to make your body a difficult environment for the virus to reproduce and inhabit while actively fighting off the infection. A symptom directly associated with an infection such as the common cold can be sepsis, which occurs if your body is not abl... |
What does "being sentenced 3 to 10 years" mean? | He must serve at least 3 years in prison, but not more than 10 years. A parole board may release him before he spends 10 years in prison, if they deem it appropriate, but not until he has spent at least 3. This is called 'indeterminate' sentencing. If the parole board does not release him, he remains in prison for 10 y... |
why does it feel like you are suspended in the air for an instant when jumping? | because at the top where you stop going up and start going down, you don't feel the pull of really anything, weightless |
what is the advantage of a car with rear wheel drive? | I'm not sure if you are talking only RWD vs FWD but that's already been covered fairly well. If you are including all wheel drive there really aren't any advantages that you are going to see on a day to day basis. It's going to be a little lighter, so that's something, especially in a lighter car, every pound matters. ... |
How can high weight low reps possibly be a healthy way to workout? | A pretty common strength training regiment for beginning weight lifters is called the strongman's 5x5, which essentially consists of the trainee completing 5 sets of 5 reps with the heaviest weight they can safely handle. The exercises are bench press, deadlift, squat, overhead press and rows of some kind. The idea is ... |
Balancing on a stationary vs moving bike | While you're moving, you can steer the bike to keep it under yourself. If you start to fall to the right you can steer a little to the right to correct the fall. |
why are lie detector tests still accepted in court as evidence when they’ve been proven to be BS many many times? | If you're asking this in the context of the Kavenaugh hearings, I just want to make a PSA that the hearing is not a criminal trial. It's essentially a job interview. Anything that can be used to change the Senators' opinions of the character of Kavenaugh can be submitted to the committee for review, including polygraph... |
If someone built a spaceship and simply flew to the moon, what kind of trouble would that person get into? | Not much, actually. A moon mission costs several million, requires large teams of people, and takes up a lot of space. If you don't violate anyone's airspace, don't trespass on anyone's land, do it entirely within legal means financially, meet emissions laws, and don't violate historical sites or existing satellites, y... |
Why do unopened water bottles never grow mold in them even at room temp? | Mold is a living thing. It doesn't pop into existence from nothing. It has to get inside the bottle. Opening the bottle let's it inside. |
Why was the Vietnam War so protested? | Can I ask sub question here? I'm not American nor have been in America before, but I'm curious about it. What did the teachers teach you in school about Vietnam war in the present time? And to the older redditors, what did they teach you in school about Vietnam war at that time, the time when the war was still happenin... |
Why some companies pay bi-weekly and some pay weekly? Is there a benefit of one over the other for the company? | There is a huge benefit to paying people as least often as possible. There are two major benefits to the employer. First, putting out payroll costs money. It requires people and resources. The more often you do it, the more it costs. But the other reason is that a lot of companies borrow the money for payroll and by ho... |
What is credit card apr and which is the right one for me? | Get a credit card from a local credit union. That way you have a place to go in person and talk if you have problems and you'll get a way better APR. My credit union has my APR at 6%While Capital One has their card at 24% variable. Don't go crazy with it and pay it off every month.APR is the interest you pay on money b... |
Why can't Russia, the USA and China just get along? Wouldn't it be mutually beneficial? | Ideology and history. In reality we all get along or else we would be at war but the media has to keep us worried so they don't lose ad revenue and anger their shareholders. |
Why electrons do not interact/get affected with strong force? | anti-blue", and "anti-green" for antiparticles. Just like positive and negative charges attract each other, color charges like to be neutral, either sticking together a color and it's anti-color for two particle systems, or all three colors together in three particle systemsEach fundamental force has a property it inte... |
what is 'the golden ratio' and what is its relevance to the way plants grow? | It's a number that helps you get the most stuff to come from one spot, which plants resemble because they have lots of stuff and one spot. |
How do we know that the stars we see at night are actually still there? | Stars live a very long time compared to how long it takes their light to travel to us. Most stars we can see with the naked eye are less than 1000 light years away, and even the fasted burning stars usually live at least 10 million years. With only a few thousand stars visible, the odds that one of them have died in th... |
what is structuralism and post-structuralism and how are they different from each other | being" etc. Then Heidegger came along and asked everybody a question: we're always searching for some kind of core, a center, but what about questioning our very need to search for the core and the center? Then there were a few others who started to question that need to find the answer to everything and connected it s... |
Why do public roads have toll booths to pay for them? Why aren't they paid for with taxes like other public services? | In some cases, the tolls were proposed as a way to make the road pay for its own construction but were kept on for various reasons . In others, the tolls are used to prevent the roads FROM becoming tax burdens. Without the tolls, the money for the upkeep and maintenance has to come from somewhere and highways are heavi... |
how can something have 0 calories, yet 4 grams of carbs? | Check the ingredients probably a sugar alcohol like erythritol. Most people discount those from carb count because they just pass through your body, therefore no calories. Looking at the generic label online, vitamin water zero has erythritol and stevia. Personally I discount these in my carb count like fiber,they don'... |
In many modern enterprises, why is it common for their to be a division in ownership (shareholders) and management (managers). | Sometimes there are people who wear both roles a founder of a company may be a substantial shareholder but also management, serving as CEO, CTO, etc. But non-management shareholders aren't day-to-day participants in the running of a company. A public company has 1000's or millions of shareholders, most of whom have not... |
why is it freezing in space if there is no matter in the vacuum to transfer body heat into? | For your information, if you removed a suit in space you would die of severe dehydration and ruptured internals far before you would freeze to death. In fact you would freeze only as quickly as your body is capable of radiating heat because there would be no matter to more quickly transfer your body's warmth to . Like ... |
How is the energy collected by wind farms stored and harnessed? | Pretty much yes. Each turbine has a generator in the hub that produces power from the spinning motion which is then routed to the local power sub station where it's distributed as needed. |
how does a fit bit know when you are asleep and what stage of sleep you are in? How accurate is it? | Similar question to the original. The new apple watch has fall detection. My father wants to get me one since I have epilepsy. How does it know you've fallen? |
How does nuclear fusion generate energy? | It can depend on the specific reaction, but for dutreium/tritium fusion, the reaction kicks out a spare neutron at very high speed. This neutron's kinetic energy is the energy output from the reaction. |
Does inflation just keeping going forever/what causes it? | Inflation is an effect caused by desires growing faster than resources. Modern central banks manage money supply to keep inflation within a certain range. In the US, the Federal Reserve target is 2%. Inflation below that, including deflation, can lead to conservative investment strategies that slow the economy by makin... |
How come we can see highly detailed images of a nebula 10,000 light years away but not planets 4.5 light years away? | What's easier to find in a pitch black room? A Lego on the floor 6inches away from your foot or the cell phone screen that's 10 ft away.On top of being way smaller Planets are absurdly dim when compared to the star right next to them. If you point a telescope at Alpha Centari the star will be 99.99% of the light basica... |
Why couldn't a rocket in space accelerate indefinitely with a constant force on it? | It certainly could. It would need: * enough energy * enough reaction mass It wouldn't go infinitely fast, because there is a speed limit. As you get closer to the speed of light, your time runs more slowly so your reactor makes less energy per second and you emit less reaction mass per second, slowing your acceleration... |
Why do some restaurants add an automatic gratuity for groups of a certain size even if the patrons ask for separate bills? | It's obvious this person has never worked in a restaraunt. Otherwise, he's understand more about the workload. Also, the other reason for the automatic gratuity is that when you have larger groups, often times you'll be pushing tables together from different servers sections, taking money out of one servers pocket. Thi... |
What does non-ionising radiation mean? | visible light, infrared and radio waves are an exaple of that, non-ionising radiaton just means that if it hits you it won't cause any harmfull effects like breaking chemical bonds. on the other side ionising radiation means that it can and will do that. |
what is different about upload and download speeds that makes ISPs give you fast download but barely any upload speed? | Depends on the tech you're using. The real answer is the average consumer uses much more download than upload. For the ISP, it's a cost issue, and largely dependent on tech. For one, upload is generally cheaper for an ISP to provide because their peering agreements typically focus on how uneven their traffic is. If the... |
How come when we swim the water doesnt go to our eardrum and/or our brain | it can get to the eardrum but not past it, as it's an airtight membrane. it wouldn't hear otherwise :-) |
How come when 3G was new it was cutting edge fast connection but now that LTE is out whenever I only have 3G connection nothing works at all? | A couple reasons fewer devices were competing for bandwidth between devices and cell towers back then. The speed at which smart phone has increased -- numbers and use per device -- has skyrocketed over the past 5 years or so, and the addition of new cell towers can't always keep pace due to zoning, NIMBYism, time and c... |
Why do computers slow down and take longer to perform even basic functions as they age? | ***:Software*** Optimization and efficiency are moving targets with computers. The older an installed program is, be it the operating system or really anything that updates, the farther your system is from stock behavior. OS patches, application errors and subsequent hotfixes, etc are all written and QA'd with the medi... |
What caused the deserts across the Sahara, Middle East, and Central Asia? | If I recall correctly, it's basically because at certain latitudes the pressure is higher due to convection of air and stuff,leading to less clouds being formed which = less rain= desert.Deforestation and overfarming. That area used to be the bread basket of humanity. In some cases the earth was salted to kill everythi... |
How do files/code get corrupted? | Imagine ripping a single page out of a book. Try reading that to someone and having it make sense. Sometimes it might just get a bit garbled, or it could be on a plot twist. Maybe it's the index and now you can't find anything, or it could be a blank page that had nothing. For files they have to adhere to a specific fo... |
Why does installing files take longer than uninstalling files on computers? | Installing and uninstalling files are kind of different. Computer memory works in two ways: memory indexes, which are like the table of contents that tell the computer where the actual information is, and the actual information itself. When you install something, you need to copy the whole 'book' including all of the a... |
how did Latin die, and how is it not spoken anywhere in the world given the size of the Roman Empire? | Well, technically it's not dead..we still use it especially in science. Scientific names, names of tissues and organs, medicines, and a lot of science stuff..even pop culture uses latin, and some conceited pricks who think highly of themselves because they know latin. |
How do all you can eat buffets stay profitable despite some individuals taking advantage by massively overeating? | A lot of people don't massively overeat. They go in, have a salad, sweet rolls, one or two small entrees, a dessert. For those kinds of people, the advantage of the buffet is that they can pick whatever they want without worrying about different prices. The second major reason is that they will eventually get you to le... |
Why are computers able to perform much more complex calculations than we are, even though they aren't as powerful as our brains? | Computers don't really do complex calculations. Everything they do comes down to some combination of these: * If the input is off/on, do/don't output a signal. * If input signal A is on and input signal B is on, then output a signal. * If either input signal A is on or input signal B is on, then output a signal. * Stor... |
Why aren’t more nations putting huge weapons up into space? | 1) it's illegal. 2) destroying a satellite is a lot easier than putting a giant railgun into space. 3) making railguns work on Earth is extremely difficult due to heating issues, doing so in space without convective cooling is an order of magnitude harder. |
Why or why shouldnt we update windows? | For a standard consumer user, you should just upgrade whenever the little box pops up. For institutional IT departments, it's not so simple. You've got to make sure that every core software package you're using - many of which have far more stringent demands than conventional consumer software - is still compatible wit... |
Why are many Japanese companies active in so many different, unrelated industries? Like Yamaha, which makes musical instruments and motorcycles | A lot of times it's because of war. BMW used to make planes for the war effort so that's why their emblem is a propeller. Sometimes the companies just dont stop. |
Why are Australia's vast empty planes simply not covered in Solar Panels to help with their power productions crisis? | *plains Partly because those huge deserts are nowhere near where people need the power to be. You can generate lots of power in the middle of nowhere, but you'll lose most of it in the process of transporting it to the cities. Spain has been fairly successful at utilising it's desert-like areas for solar power, but it ... |
why does sugar need stirring in order to dissolve in hot drinks? | Think of the water near the sugar as being on a scale, where 0 is 'absolutely pure water, with no sugar in it', and 100 is 'as loaded up with sugar as it's possible to get' . Things dissolve faster in water near the zero, pure-water end of the scale than they do towards the 100, saturation point end. However, it doesn'... |
Why are sun-dried foods, such as tomatoes, safe to eat, while eating a tomato you left on the windowsill for too long would probably make you ill? | What about black limes? Does the acid prevent the bacteria from forming? I've seen limes mold on the outside but maybe those weren't set to drying in the sun. From this thread, it seems sun dried tomatoes are sliced before they're dried, and possibly salted. Black limes are whole and unsalted as far as I know. |
Why dont we stuff nuclear waste back into the already radiated uranium mine? | Not only what has been mentioned already, but also all that 'waste' is still useful fuel if we did nuclear better. A great talk on Thorium nuclear power, which I think is currently our most viable path forward. _URL_0_ Edit: spelling |
Why does a rug feel warmer than a tile floor when they are at the same temperature? | Hopefully this won't get removed, but this older video from Vertasium should answer the question for you._URL_0_It's produced in a very easy to undertsand way, so IMO it is great for an ELI5.It also means I don't ahve to type out the whole thing. |
. Why are old paintings painstakingly restored, but other antiques lose their value when the patina is removed? | Because what accumulates on paintings isn't patina, it's soot, dust, and grime. Additionally, other antiques tend to lose their value mostly when they're restored poorly, which actually damages them or removes key features. |
why are mobile companies removing headphone jacks from smartphones nowadays ? | It comes down to space. There is a constant drive to make smaller or slimmer phones with larger screens and better battery life. With those kinds of pressures, the internal space becomes precious. From a design standpoint, any hardware component in the phone must be weighed against the space it occupies . The headphone... |
How to not become homeless | Get a job, if you can't drive, walk or use public transportation. Find a cheap apartment you can afford with your income . Then when you have that situated find some transportation. Doesn't have to be nice, just a car, then get a license. Then look around for better-paying jobs now that you have transportation. |
Please explain Carl Jung's theory on the shadow self and how to find your shadow self. | If you'd like an abstract representation of this theory, theres a series of games called Persona that builds carl jung's theories into it. |
Why are the chips in debit cards a thing? | The chip basically has an encryption key hardcoded in it. The server sends over a number, the card performs a calculation on it, and responds to the server, which verifies the response. The encryption key can't be directly read and copied. The information on the magnetic stripe is static and can be easily copied. |
How does flak ammo work and why is it only used against airborne targets? | Something I don't get is how did they know what altitude the plane was flying at and how did the shells burst at that specific height? Or was it just kind of guess work? |
How does a plane become "invisible" to radar? | The reason you can see light things and not dark things is because they reflect the light back at you. Ordinary objects do the same with radar. If they absorb the radar rather than reflect it, we don't know it's there. Same with black holes. Light goes in, but never reflects back out. We have no idea what they look lik... |
How does casting of underage children work for R-rated movies? | The children are necer there to see anything bad its why wben they show the child its almost always of the child on its own or at the very least the camera is pointed towards the child so you only see the child's reaction. So from a watchers perspective the child is in the midst of the danger when at most they are stan... |
Why is it called clean energy if Nuclear Power creates Nuclear waste? | Because nuclear power doesn’t produce much CO2 if any at all, so it's “clean” as it doesn’t impact our carbon footprint and global warming, And yes nuclear waste is dangerous, but it does not contribute to pollution if properly stored ", 'Besides what all these guys are saying, some nuclear plants are designed to use t... |
Why do magnets "die" after a while of being used? | While everyone else is right about how magnets can be demagnetized, what the hell are you doing with your magnets to make them demagnetized? That's not an easy thing to do. |
How people who communicate in sign language raise babies that can communicate verbally | Learning Sign Language as a first language allows the child to develop their 'linguistic brain' perfectly well. From there, the child can learn aural/verbal languages fine, as said by others here, from exposure via media, hearing family members and friends, teachers and peers. |
What is NAT and why does it make playing with friends a pain in the butt on consoles? | NAT was an emergency measure that was taken when smart people realized that 32 bits for addressing just ain't enough. It's horrible and, as you note, it breaks end-to-end connectivity. The problem is that when you're behind a NAT you no longer have a globally unique address. This means that other machines can't contact... |
What is Raspberry Pi and what can you do with it? | I've only seen it used as a streaming device. Not quit sure but a lot of people use it for that. |
Can someone ELI5 these time-is-an-illusion theories | This doesn't make sense to me because as humans, we perceive time based on proven theories. i.e. the Earth revolving around the sun and the 360 degree rotation of the Earth on it's axis. |
Antimatter and if sound can be heard through it | Yes, it can carry sound. But unless you're made of antimatter too , no interface can transfer those pressure waves to your ear without annihilation. |
What would happen if you had all of your spine fused | A friend of mine's wife had her spine fused at a young age thanks to scoliosis. Big old titanium rod glued right to it. She's not a dancer, but she's more-or-less fine. She can't bend her back in any way. It makes driving a little difficult because she can't turn to look beside/behind her. Otherwise it's basically fine... |
How are secret government buildings/facilities kept from beings exposed by construction workers who worked at the cites? (Secret bunkers, bases, etc) | A lot of it is done under the cover of some other project. Contract is out for an underground water reservoir tank, or underground fuel tank. Its inside a mountain commercial contractors come in, in the US, generally from firms that have extensive experience with government contracts like Bechtel/J.F. Shea/AECOM They c... |
Why is it so difficult to stop peeing halfway while it's so much easier to control your bladder before you start? | I stop purposefully to strengthen my kegel because I've heard strong a strong kegel helps prevent colon cancer. Forgot where I read this though.Probably due to practice. You’re practicing holding it in all the time, but you’re never practicing to stop midway thrui, oddly, must have very strong muscles or control down t... |
Ayn Rand, and why people are so enamoured or not with her. | She gives very easy answers to really complicated issues, which, as we all know, are never the right answers. People like easy, especially when, in Rand's case, you can point to other people and blame them for everything wrong in the world .Have you ever played bioshock? The “perfect” world envisioned in bioshock is wh... |
Why does it feel so..relieving to break something when we are very angry? | Catharsis. When you've been holding something back and finally let it out in a way that is maybe destructive to something but not to relationships or your job or whatnot. I work in IT and we have a stack of laptops in the shop that can be taken out into the parking lot and can be thrown/ stomped on/ whatever to let off... |
Why is the highest income bracket in US federal taxes $415K (36.9%), why not have higher taxed brackets at over $1M? | if you were going to do that, I would make it higher, make it a billion. how it is now you are putting the franchise owner of two McDonalds stores in the same bracket as Jeff Bezos. but that being said even if you raised the bracket you wouldn't really hit them because they get their money from stock distributions whic... |
How do junkyard/Dumps sort trash and recycling? | They don't.. sometimes they'll have an assembly line conveyer belt that will separate but most goes into the landfill unless they have a good buyer. |
Why is key copying and shoe repair often done in the same store? | Mostly from competition. The other shoe guy got a key cutter so we got a key cutter. We got an engraver so he got an engraver. And so on. They're all fairly low space requirements and easy to jam it all into a kiosk. I've worked in one for near on 10 years and we keep adding services. We do all the car keys and remotes... |
What purpose do wasps serve? | The Yellow Jacket may be a dangerous plague in many places of the planet, but wasps within their ecosystem and niche are useful and requested predators. Although we like to think of the insect world as the bottom of the food chain, the actual food web is quite complex in their realm. Wasps and spiders are ferocious pre... |
Why is gravity the weakest fundamental force? | As far as we know, that's just the way the universe is set up. One of the things physicists hope for in a [Theory of Everything] that describes both gravity and quantum mechanics is that it might contain some fundamental formulas from which the relative strengths of the fundamental forces derive automatically . But it'... |
how are we able to clearly visualize images in our head of things we have seen and also have never seen before? | The same way that you can write about something you've never personally experienced or done. Imagination. The human brain isn't restricted to pondering things that it has personally done or experienced before. Although if you're visualizing something you've never personally seen before, the accuracy may vary as you're ... |
Why doesn’t alcohol freeze like water? | It does, just at a lower temperature. I think for vodka it's around -35' C. It varies with the alcohol concentration. |
How does bruteforcing work? | They do the lockout to prevent a bruteforce attack on their login system. In that case usually a bot or bots would attempt to go through lists of probable passwords to see if yours is weak and gain access. A pure bruteforce method is when the bots attempt to try every possible password. That is a very, very large numbe... |
What is so special about primes? | That's just it, finding an algorithm for calculating primes outside the brute Force method had led to the formation of theorems. Conversely, prime members occur often in natural systems and organisms. There's nothing particularly special about their value. Which is exactly why they're hard to calculate/find. |
How does voting in the Midterm election work? | When you registered, you gave them your address. Usually 4 weeks before the election they mail you a sample ballot. This has who is running and where your polling place is. You check out these people, and on election day you go to the designated place. The workers there will teach you how to use whatever machinethey us... |
Why can't we just scratch all billions of debt countries have and 'start over'? | Same reason people can't. Bc there are people and countries who are owed that money and want it back. Though Brazil did try saying that they weren't going to pay back their debts with mixed success. |
Why is the skin on bald men's heads shiny but skin everywhere else on the body is dull? | Ive read a few of these and honestly I feel like it's all of them in special cases.1st case : going bald - your hair follicles die, causing your pores to close and make you skin smoother, effectively making it more reflective 2nd case: shaving - shaving exfoliates, removing dead skin and making your skin smoother but n... |
Why is pee yellow when you are dehydrated? | On a basic level, you can think of urine as being made up of two things: water and gunk, the gunk being all sorts of waste products from your bloodstream that need to go out. Urinating serves the dual purposes of getting rid of excess water and getting rid of the gunk. The gunk has that yellow color, whereas the water ... |
Why do recycling plants throw away dirty recyclables? Why haven't they been able to find an efficient way to cleanse them on their own? | How clean do recyclables need to be? Am I supposed to wash everything, or is some food residue acceptable? I've heard you're also supposed to separate the paper labels. Is that true?", 'Recycling is largely a scam. Except for aluminum cans, just about everything in your waste stream has a negative value, that is, it co... |
Why is copper deadly to certain organisms like bacteria and snails but not to humans? | We actually do copper pretty well in the human body Its excreted through the biliary system if there's excess . Apart from in Wilson's disease. It's a rare but interesting disorder and I've seen it kill. _URL_2_ |
Why is it so difficult to memorize some of the things which we really need to whereas somethings we easily memorize without even putting in the effort to do so? | Think of memory like a big spiderweb. Each strand is a different memory, feeling, or association. When you remember something new, it falls in the web. The more strands it hits, the more likely you are to remember it, and with more accuracy. Your senses, such as taste, touch, sight, hearing, smelling, and all the other... |
Why do popsicles freeze in such a "soft" way that it's really easy to bite through them, but ice itself freezes so darn hard? | It's the sugar. When sugar water freezes, the sugar doesn't become part of the ice crystal, and so it gets left behind dissolved in the liquid. As the freezing continues, the sugar water turns to a slush, then to a matrix of ice crystals with a little bit of very concentrated syrup in the gaps between crystals. The sug... |
We have free Wifi on Trains, Ships, Buses, Metros etc. What makes it so difficult to have free Wifi on airplanes? | It's the same reason why a glass of beer at a stadium costs $15. Supply and demand. Airlines have full control of supply, so any demand has to go through them. So they find a balance where they optimize profit, because they figure 80% of people who want to use it will pay *anything* for wifi in the air. And that means ... |
Why can some meats be consumed while not fully cooked | Pork meat can contain a number of parasites, most often pork tapeworms, so it shouldn't be eaten raw. However traditional methods of curing pork using Lactic acid fermentation, will kill these parasites, due to acidic and salt. For example, salame and prosciutto. The salt and acidity also prevents the growth of harmful... |
What's to stop us from just putting solar panels on every flat surface possible? | I despise the fact that cost is everyone's answer to this. Its not wrong just depressing? Definitely feels like we have our priorities out of order. Maybe I'm being too empirical? Not to diminish any of the other valid point: viability based on location is completely legit among other issues. It just always comes back ... |
the Van Allen belt and how we surpassed it on our way to the moon | The Sun throws out fast, electric particles called solar wind. These would make us sick if they hit us. However, the Earth is a giant magnet, and it bends those particles away from us and keeps them from reaching us. It also traps them in a ring around the Earth. That ring is the Van Allen belt. The astronauts passed t... |
why do some countries have such superior internet speed and connectivity compared to others? What are these speeds based off of? | Answers so far discuss latency . Internet speed is more about bandwidth though . Some countries have prioritized getting fiber installed to homes and getting competition on that fiber or getting a municipal or other ISP that answers to the users instead of to shareholders. There are pockets of that in the U.S., but in ... |
How do all the animals survive just fine by eating (mostly) one food while humans need a very diversified diet? | Many animals do not have the life expectancy that humans have. Many die within 5 to 10 yrs. The other thing to keep in mind is that animals aren't going to a grocery store buying their food, which can be lacking in nutrients found in wild game and/or produce. Many eons ago, most humans did not have the luxury of a dive... |
Why are insanely huge debts owned by countries never considered a big deal? | Debts held by a country are not the same as debts held by individuals, because countries are not individuals. Sovereign nations can do many things to raise money, such as taxation or printing new currency, that individuals are not able to do. Countries are also more reliable than individuals. Countries don't lose their... |
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