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When your iris changes in size from light why does does the area we can see not change? | This is an amazing question!! Good job! Tbh, I don't even need to know the answer, I just came here to say I am IMPRESSED by your thought process! |
Why is alcohol measured in ABV instead of the size of an actual measurement, like they do with marijuana products? | It's because alcohol was originally checked by proofing. Proof that it could burn gunpowder I believe. Proof is double the abv. 35% 70 proof. And you do alcohol by volume because it works for measuring the alcohol in a given area. Having measurements of alcohol makes no sense outside of things that need those numbers. ... |
What's the basis for US Confederate support today? | Racism is certainly a factor as other comments suggest but it's far from the only reason. The US, as much if not more than any other western country, drives into its citizens a sense of pride in their heratage.its why so many Americans insist America is the greatest country in the world. With that desire for pride bake... |
Could we build nuclear power plants underground? | Yes, it's possible. In fact, there have been many experimental reactors built underground. The problem is cost of maintenance and building the thing in the first place. Nuclear power plants are already incredibly expensive above ground, building it underground would dramatically increase the costs. These plants undergo... |
How can scientists be confident that GMOs won't have multigenerational impact? | In a typical GMO, it is well understood what genes have been changed, so their impact is predictable. Nothing about having future generations changes this point. By analogy: how do you know painting your house won't make it catch fire? Because that's not what paint does. |
Why is there so much clipping/ what causes the clipping in Bethesda games? | To be fair, Fallout 4 was built on the Skyrim engine which is almost a decade old. That being said, Bethesda open world games have so many different types of outfits, weapons, attachments, that it is difficult/impossible for them to create animations that cater to every single possibility. This is speaking to the case ... |
With so little land and resources, how is Great Britain still as rich and powerful as it is today? | Probably there are tons of reasons, of course. If we could figure out what makes a country work well we'd just do that everywhere, right? It is generally accepted to be true that one thing really works to their benefit is that English is the world trade and financial language. So, the UK being the largest English speak... |
When flying in the US, why does TSA allow two 3.4oz bottles but not one 6oz bottle? | The reason for the overall total limit is because the explosives scientists generally agreed that it would be very difficult to make an explosive mixture of that amount or less. It does seem a bit odd that you can't bring that amount in one bottle but the reasoning is pretty similar - it's hard to make a bomb that smal... |
Why do customers at stores or restaurants seem to come in waves? | It all has to do with real-world flow of workers and events, which is *much* more complex than just 9-5 workday rush hours. Schools all start and let out at the same time, which means that there are all parents leaving their house at the same time to drop-off/pick up kids or teenagers going to/leaving school at the sam... |
How can a half-built house be left in the weather with no issues? I’m talking about a wood frame with plastic in the rain type of thing. | Any wood in direct contact with cement must be treated since concrete always has some level of humidity. All the other wood sheds water rather well. Also all the 2x4 or 2x6 and such are in a place that is exposed to air and can dry quickly. The only thing that is a problem is OSB plywood. On a vertical wall it still sh... |
why does the US not officially recognize Taiwan as a sovereign state? What would happen if the US decided to? | We don't because China doesn't want us to. China is a major trade partner with the US, Taiwan is less so. If the US had an issue like the Taiwan/mainland separation, China would also acknowledge it's ownership. The Chinese government is extremely insistent that Taiwan is part of China. & #x200B; What would happen? Chan... |
Why don’t car manufacturers make cars that seat 3 up front anymore? | It's a combination of factors: people are bigger, safety rules are stricter , cars are smaller, families are smaller, Car companies make more of what people buy.“Bucket seats” used to be a selling point for particular models. People don’t want bench seats anymore. Car manufacturers aren’t in the business of making thin... |
What exactly is the Google Stadia? | Google Stadia is a video gaming platform deisgned to compete with Sony Playstation and Microsoft XBox. The difference is that instead of owning a physical box that plays the game Stadia will run the game in it's own datacenters and stream the pre-rendered images to your screen via your internet connection. In theory th... |
Why phone and laptop companies still use Li-ion batteries? | Weight. Consumer devices don't just use Li-ion batteries. They use the LCO variety of Li-ion batteries. This variety was the first type of rechargeable lithium battery, invented in 1979 and first sold in 1991. It's also one of the least advanced types of lithium battery on most metrics, with low cycle durability, slowi... |
the idea of the universe being a projection? | The best example I've seen is from Rick and Morty. The game at Blipz and Chitz is called Roy: A Life Well Lived. |
Why isn’t light noisy? It’s going faster than the speed of sound, so why doesn’t it make a sonic boom? | While photos don't have rest mass, they have relativistic mass and exert pressure on things . This means that when photon is hitting air molecules, it physically pushes it, which is how sound travels trough medium. So, light in fact makes sound. But sound of air hitting other air is much louder than light hitting air a... |
Why do rocket launches not take place from high altitudes? (ex. the point of Mt. Everest) | As much as it makes logical sense, it usually doesn't make logistical sense. Those high elevation areas, like Everest, are hard to get to and may have unstable surfaces unsuitable for building on. Everest itself is covered in glaciers rhar crack, split, and shift. The weather at those elevations can be unpredictable as... |
How do babies have thoughts or react to language when they have no concept of language? | I think it's very similar to the way dogs react to language . So even though they dont know what it means, they understand the emotion behind it.I read something not long ago that suggests that by six months old babies can recognise common words and also they can recognise gestures and signs, i take my baby to a baby s... |
How can antibiotics mask symptoms? If you're feeling better, doesn't that mean they're working? | Even though this has been answered well, and this might be out of scope of the question, I want to reiterate the point u/dkf295 made: even if you're feeling better, always always always finish the course of any antibiotic treatment you're given for an illness. If you don't, you run the risk of the bacteria that survive... |
If a DNA sample is not available, can a close determination of a DNA profile be made of that person if there are DNA samples of blood relatives? | Parents are like children, due to genetics, because mutations are relatively rare and only two people's DNA is merged in each generation. So, if you have a sample from someone, their uncle can differ in many fewer ways than an unrelated person. It's not an exact match, but it can help you prioritize which leads to foll... |
how Vitamin A, B, and C work | You are asking about 10 different vitamins here, all with different functions . They key thing they share in common is that your body needs to convert some chemicals to other chemicals. It has enzymes that do this. Some of those enzymes need vitamins in order to function. For example, your body needs to make a molecule... |
how does the action of scrubbing your hands (often with soap) help kill off bacteria? | washing your hands isn't about killing bacteria. it's about getting them off your hands and into the sink and drain.Killing bacteria when washing your hands is both unnecessary and actually bad. The point is just to get them off your hands. By using anti-bacterial soap and actually killing them you would be contributin... |
How are people in the military credited with a certain amount of kills? | different countries had different rules. at least in world war 2, typically a victory only counts if pilot ejection, explosion, or crash is recorded on gun cam or vouched by another pilot who was there. the US and britain had half-credit systems where two pilots could share a kill and get half a credit for each. if no ... |
Why can't we truly delete pictures and documents from a cellhpone or a computer ? | You can fully delete documents from a computer, it just takes more time and effort then we're normally interested in taking. To create a file you need to write every byte of it to the HDD, SSD or SD card as well as create an entry in the file system saying where the file is and reporting that the area of the disk it's ... |
how slavery worked in prehistoric/ ancient times. | Depends on the civilization. In Rome, for instance, you could become a slave a variety of ways including: being captured in battle, being sold as a child by your parents, being born into slavery as child, breaking the law, or you could even sell yourself into slavery to pay off a debt. The Roman's kept slaves in line b... |
Why are there not Audiobook and Ebook streaming services like Netflix, where a member can access as much content as they want, without paying a per usage fee. | Okey" and the "Limey". I prefer the "unvoiced" readings of Blackstone Audio and Books on Tape. I'm not alone in only being able to listen to Audible audiobooks at x2 or x3 speed to supress the horrible "performance" aspect. Lately I find listening to computer generated text-to-speech preferable to listening to Audible.... |
What is the Holographic Principal? | My understanding is that it's like this: a lower dimensional interaction of forces/fields gives rise to the physical interactions in 3+1 spacetime we experience and observe.It is mathematical in nature, but maths in physics are interpreted to mean something physical . However, ads/cft which is an instance where the hol... |
How do marketplaces (e.g. _URL_0_) handle currencies? | You actually pay _URL_1_ and then booking pays the hotel. Booking doesn't care what currency you pay them in, their bank takes care of it. When booking pays the hotel, they will pay in whatever currency their deal with the hotel is set that they pay in . Currency conversions aren't very expensive. |
Why does spit/saliva work well as lube whereas water does not? | It's all about the enzymes: amino acid protein chains. Your spit is loaded with such enzymes, because spit is designed to help lubricate your food, so that your food slides down your esophagus more easily. Where-as regular tap water does NOT contain all those enzymes. |
Why does meat that has been frozen for a short while taste fine cooked but not when it's been frozen for a long time? | There are some great answers here. I'd like to add that when water freezes, it forms sharp ice crystals that rip the meat apart. Your freezer isn't very consistent - opening the door, losing power, and similar things can cause the ice to partially melt and re-freeze. This rips into the meat over and over, turning it gr... |
How does a fuel pump always know when to stop pumping? | It depends on the design. An old-school carburetor fuel pump outputs constant-ish pressure. When the carburetor bowl gets full a float closes the valve. The pump keeps running but the gas stops moving. An electric fuel pump for fuel injection might have a pressure sensor that turns it on and off. Fuel pumps aren'y usua... |
Why do seatbelts sometimes lock and get really tight to the point where you cannot move forward | a lock engages when you decelerate. also, if you pull the belt all the way out it locks again where it retracts but wont loosen untill it's been completely retracted. this is for securing baby seats |
Which variables, both on the buyer and sellers’ side, are most critical when deciding between a vehicle lease, or purchase? | 100% the only answer to this is whether you want to deal with the hassle of selling the car at the end of 3 years. If you have a $30,000 car and it's expected to be worth $20,000 in 3 years, your lease payments will add up to $10,000 . If the car company gave you a lease for only $9,000 and the car lost $10,000 in that... |
How and why does the time of the day affect our emotions? | There's a hormone your body produces called cortisol. This does a LOT of things, but importantly, when there's plenty of it, it makes you feel like you're more energetic, which often corresponds with mood. Your cortisol levels change throughout the day, with their highest levels in the late morning & their lowest level... |
How does a bootstrap paradox work? | Let's say a man has a time machine. And he really, really likes Beethoven. So he loads up the machine with all his records, & goes back to meet Beethoven. One problem: no Beethoven. History got it wrong; Beethoven never existed. So the time traveler sits down with his Beethoven-filled record player & painstakingly writ... |
What is a bone marrow transplant? | During a bone marrow transplant the recipient's bone marrow cells are destroyed using chemotherapy, this is known as conditioning. The recipient is then injected with donor stem cells into the bloodstream. Stem cells travel through the bloodstream and into the bone marrow to create new bone marrow cells. |
Is every individual sperm a potentially different child with different attributes? | Yep. Every single sperm cell has a unique half of the father's DNA that will combine with a unique half of the mother's DNA in the egg to make a unique new person. Every single sperm cell from the same ejaculation fertilizing an egg would produce a different, unqiue offspring. If a different sperm had fertilized your m... |
Why didn't we ever get immune to colds if it's so common? | Because the virus constantly changes, like the flu, and your body can only prep against versions it's already fought. |
How/why do cars with a start-stop system not use more gas or harm the engine more than regular engines? | The vehicles that have this have heavier duty components that are made for more frequent on/off cycles. Usually a larger capacity battery and more strict tolerances on moving parts. It takes much less fuel to restart a warm engine than a cold one. In my area, these things are nearly useless because they turn off the A/... |
How come acid can't dissolve ceramic or glass vials but it can go through metal? | Most acids have the H+ ion as the active part . H+ is an oxidizer, which means it takes electrons. Metals are reducers, which means they have electrons to spare. Ceramics have no electrons to spare, they are oxides of elements like aluminium or silicon, they are already oxidized. Therefore, H+ reacts with metals and do... |
How do we know for sure that there's a recession coming, and why can't we stop it? | Its very similar to the fact that we know its going to rain again and cant stop it. Its a natural thing. When will it rain exactly? We can only guess. Same can be said for recessions, they are a natural outcome of the economic process. Nobody actually knows with any real certainty when or why it will happen just that i... |
What are API's, and how do they work between software or applications? | Kind of like a socket and plug. One program exposes its functions and procedures to anyone or anything that knows how to connect to it. Then, another program connects, and uses the functions that have been exposed. An example would be a site like Facebook. You can post comments, or share, but those are functions within... |
How can scientist determine what things are made of on different planets or moons? | They do it by analyzing the light from the distant body. The light enters the telescope and is run through a device similar to a prism you hang in your window, just really carefully tuned/focused. Once it is in rainbow form, it is run through a polarizer, very similar to polarized sunglasses. The resulting spectrum sho... |
Why are women born with their eggs, but men produce sperm monthly? | Women's bodies suffer a lot more strain in reproduction, so they need to be relatively young to have a healthy pregnancy anyway. So there's no point in everlasting eggs.I grew up with this as common knowledge. There are some recent findings suggesting this may not be entirely accurate Note to self to not take common kn... |
How are LEDs brighter and more powerful, yet use so little energy? | Old style lights work by heating up a something so it glows, giving off light. But glowing things will always give off most of their light as infra red, or, if you make it really, really hot, ultra-violet. Visible light makes up a small part of the spectrum of lights, so you can't make these type of lights efficient. E... |
how do subsidies work, such as fossil fuel or farm subsidies? What benefits do they provide and/or what harm would result from stopping them? | effective" or "beneficial" is not easy to gauge. Some are not so controversial while others perhaps are highly debated. Fuel subsidies, for example, can fall partly into the "public good" as well as "government policy" argument. Without subsidies, fuel prices will increase. From a policy perspective, this hurts the poo... |
Why haven’t we gone to a specific screw type yet? | > So my question is why are there so many different kinds of screws? Self answered questions are the best questions: > The designs are meant for preventing slipping and stripping. They also involve different torque. > Wouldn’t there be a superior design that would handle the problems above? No, not really. You can't de... |
what was the Berlin Wall | A barrier designed to prevent people from fleeing the Soviet-occupied East Germany. It wasn't just a wall, but included fences, guard towers and minefields. If you find it odd that a worker's utopia should have to prevent their citizens from trying to escape, you aren't the only one.A long line of concrete bricks side ... |
Is the solar system flat the way it is depicted in images or is it spherical? If it is flat, why? | Flat-ish. They're all almost flat-ish - that is, the bodies in them tend to stay in a single orbital plane. They do that because they are all formed from a single spinning disk of material, which collects into lumps - that means that all the lumps tend to spin the same direction, and are orbiting around the center of m... |
Why does aluminum foil never get hot to the touch. You can leave it in the oven and touch it directly out of the oven without it feeling hot. Why is this? | The reasons are twofold. On the materials side, a lot of people are getting at the gist of it: a thin sheet of aluminum doesn't have a lot of thermal energy. That's just a property of aluminum, and also due to the fact that there's not a lot. The biological side is being neglected, though. You have nerve endings that m... |
What is the origin of the US-American "gun culture"? | Slightly off-topic but relevant to 'gun culture,' I once traveled to Japan for business, I was asked during an after-hours meeting at a restaurant how many guns I owned. I told the group honestly I wasn't sure; I'd have to think about it for a minute, and they were just floored by that. The truth of the matter is I hav... |
How is a word created? How does it become a generally accepted term by a population? | Not a language expert. But i assume that our earliest ancestors needed to communicate. What started off as grunts or sounds needed to become more complex to actually describe what they were trying to communicate to each other. Eventually rules were made to help everybody understand each other and language developed fro... |
Why is it so popular in Japan to have regional / seasonal limited edition goods? | Money. They can charge a lot more on the premise of exclusivity. That's the main reason any store anywhere does seasonal and limited goods. And making it regional makes it rare in other countries, allowing the money to flow back into the economy through the use of websites like eBay. Sure, the money may not go back to ... |
Why does it feel disgusting/crap to watch the porn you have just been watching after you ejaculate. | Pretty much the same reason that the thought of eating any food is sickening after you've stuffed yourself with a big meal. Being hungry and being horny are very similar if you think about it.We find things disgusting because disgusting things have lots of bacteria/diseases which will harm us. Feeling of disgusting is ... |
why does your body get itchy when you're over tired? | I have never heard of this before. It doesn't happen to me. Does it really happen to you? |
- why do people post pictures of themselves to be roasted? What are they getting out of that-besides some humiliating comments about themselves? | They are the type of people that aren't insecure and sensitive. They show their friends the insults and get a good laugh out of it. |
how does washing detergent work? | Detergent contains a surfactant, short for surface active agent that creates surface tension so dirt and grease stay in solution and don't redeposit back to the item being washed. |
What specifically stops my bank from being able to alter my account balances? | Foremost, the law. Most people aren't criminals or are predisposed to commit crime. But, if they are doing their job, they will implement technical and operational controls and procedures to prevent a random person from altering these records, and/or alert them if it happens. To be sure, *you* will certainly alert the ... |
Why when i'm trying to sleep, sometimes my body do the fake fall thing ? | To cope with ptsd nightmares, I tried to go to bed early with a sleeping pill a few times.That jolt feeling kept happening and my arms would flail out like a startled infant.It was he'll. I was so sleepy but my body kept doing it.I'm back to insomnia. |
How do slap bracelets work? | The slap bracelet is known as a blistable spring, which is a spring that has two stable states. In it's long, straight shape, it is stable, but with a strain on it. It makes it want to bend into a circle. Deforming it a little bit by applying pressure to one part of it causes that part to roll up, and reduces the stren... |
Why does it hurt when you bite something you weren't expecting to be hard? | I wouldn't call rice with unexpected seed *severe* pain, but maybe you just have a sensitive mouth . If you're biting down you got a lot of energy pent up in there. That energy has to go somewhere. Usually it'd go into breaking the bonds holding your food together, dampening the ultimate blow. However, if there's somet... |
Why does very cold water feel so refreshing, even if you’re not necessarily warm and when warmer water is easier to absorb? | It's a reflex, called the diving reflex. All air breathing vertebrates experience a drop in heart rate and changes in blood flow when they're immersed in cold water. Some people think this reflex is there because it helps animals to survive in cold water. Edit: autocorrect butchered my post", 'Personal preference, I kn... |
How come humans have low relative strength, compared to other animals? | What we lack in raw strength, we make up for in smarts, dexterity, and teamwork. We didn't evolve giant muscles to beat up our prey because we invented sharp tools and hunting strategies for tribes to take down animals. We also discovered ways to forage food, store it safely, and grow our own which means we had a relia... |
how come doctors and nurses (or anyone working in the health care environment) are not constantly sick or catching stuff from infected patients. | PPE and BSI with understanding of how much is required for the situation. Generally people in healthcare wash their hands between every patient and are more careful. As an EMT we wear gloves and if there is a known contagious air borne illness we wear face masks designed to not allow the contagion to be breathed in. Ev... |
Why are there multiple methods for measuring electricity? (Volts, amps, watts, etc.) | Because they each measure a different aspect of electrical current. Volts = The pressure of the electricity . A lot of pressure doesn't necessarily mean a lot of water will come out. Amps = The amount of electricity . A lot of flow doesn't mean high pressure. Watts = A combination of both volts and amps to measure the ... |
Suicide is listed as a side effect of over 200 common medications. How, specifically, do these medications increase the risk of suicide? | My psychiatrist told me that Paxil has a suicide warning because when you first start taking it, it gives you more energy than you had before. If you were already feeling suicidal and you have increased energy, there's a slightly higher chance of you acting on those suicidal thoughts. So most medications don't inherent... |
What is the difference between sievert, roentgen, and gray? Why is radiation measured with different units? What other units are used to measure radiation? | Bananas can also be used as units for measuring radioactivity. It's called the BED or banana equivalent dose. |
Why is water (H2O) effective at putting out fires when fire requires oxygen to keep burning? | The fire won't break apart the water molecules into hydrogen and oxygen molecules. It requires a lot more energy to do that. Good thing, too - hydrogen can be explosive. |
Why do so many things in California cause cancer? | I think it's just the law in California, most things are dangerous or can cause various symptoms if not treated correctly. E.g Copper is poisonous So is the green stuff that it grows Some forms of plastic are highly flammable and can give off very toxic fumes Most of the internal parts of mechanical watches are made of... |
why cant different species breed with each other? If they both have sperm and ovum? | When you take half the genes from one parent, and half the genes from another parent, and combine them, they need to combine into something that works. Imagine doing this with cars. Take two Honda Accords and take them completely apart, swap half the parts with one with the corresponding parts from the other. Then put ... |
What's the difference between RJ-45, CAT5, CAT6, and Ethernet cables? | RJ45 is the name of the portCat 5/6/7 that's the type of cable every type supports different max length and speedEthernet cable is a cat 5/6/7 with an rj45 heads |
What is the uncanny valley? | The uncanny valley effect arises primarily due to our emotional connection to who or what we're looking at. Our brains do a lot of subconscious work when we look at someone, evaluating dozens of different factors without us consciously being aware of the evaluation. If something looks sufficiently close to human, but j... |
why you can chug almost all drinks, yet alcohol is so hard to chug. | Alcohol is a very good solvent. We divide stuff into water based and fat based. Water dissolves water based things but not fat, fat solutions dissolve fat based things but not water. Alcohl essentially has a water end and a fat end so it can dissolve both water and fat based things. This is why alcohol is such a good c... |
Why do household smoke alarms use D batteries instead of the more common AA batteries? | i have yet to see one that isnt 9v but, they use larger cells because, while being passive in nature, the smoke detector is always using power and would drain the AA too fast. AA is used more for push button applications, where you only need power for a moment while you pusha button. So if you are seeing D cell batteri... |
Why does going 100mph in a car feel so much faster than going 500mph on an airplane? | Humans can't feel velocity. We're hurtling through space relative to the Sun at over 60,000 mph. We're hurtling through space relative to the galaxy at a million mph. We don't feel that. What we feel is acceleration and impact. And what we perceive is based on how fast things change in our view and what we hear. At cru... |
How do electric fences shock things if they are only touching one end of the wire, not allowing it to complete the circuit. | So, in theory, if I was to jump in the air and touch the wire briefly while airborne, i wouldn't get a shock, right? |
How does changing a country's debt from the USD to its local currency benefit that country? | Using their own currency allows a country to control their inflation and interest rates and change the monetary supply. This gives them a lot more control over the economy to help stimulate growth in weak periods or slow down overheated markets. *But* It also gives them the power to cause economic disaster if they do i... |
Why is it that Asians get the Asian blush? I understand it has something to do with an enzyme, but what is the trend between this issue with alcohol & Asians primarily ? | The first thing to know is that the alcohol itself is not responsible for your hangover, but rather the first breakdown product is. This first breakdown product is acetaldehyde, which is then further broken down to acetate , which is harmless. However, if you drink enough, your body can't only convert the acetaldehyde ... |
How do metal detectors only sense metal? | Ferro metals! It's using magnetism. That's why you have these disk shaped, and even hollow circles. Current flows through there, creates a magnetic field. If any ferro-metal is in the ground it disrupts the magnetic field and the operator gets a signal |
Is economics a science? | Economics is a social science. There's macroeconomics that concerns itself with fundamentals, national trade, GDP, etc. Then there's microeconomics that concerns itself with individual decisions. & #x200B; It's controversial because beyond some basics, it tries to treat the economy as an abstract mathematical model, an... |
What happens in species that can hibernate which prevents musculature atrophy? | Muscle atrophy is part of a cycle of the buildup and breakdown of muscle fibers. When not using the muscles this is entirely based on the activity of enzymes, some that break down muscle fibers and some building new muscle fibers. The demand for new fibers is very low when the muscles aren't stressed so muscle is lost.... |
How do fruit flies start? | You leave food out for a few days. You don't see any flies around your house. But those suckers are small, and can hide. One sneaks in when you open your window. One sneaks in when you opened your door to accept your pizza delivery. One comes through when you carry your shopping in. That fly eventually finds the food a... |
when watching a live sports broadcast, why does radio tend to deliver audio feeds a few seconds before transmitted via television? Why are they not equally quick? | In the old days of analog TV, the radio and TV would be in sync. With today's digital video, there are delays inherent in the compression/decompression process. The video is usually transported in compressed format and may need to go through several compression/decompression cycles. The final delivery via broadcast is ... |
Can we use science to create a “poopless” food? | Feces is compared of many parts. A large portion of feces, besides solid waste products from our own body, that's going to happen no matter what you eat. Another large component is actually the bacteria that thrived off the food. And this is necessary as they break down things like cellulose for us, so it needs to be i... |
Why can’t hybrid animals (e.g liger) reproduce? | To produce a working sperm or egg the total number of chromosmes the animal has have to be even. Hybrids tend to have odd number of chromosomes. This means the zygotes don't form properly and makes the animal infertile. |
airplanes cruising altitude when flying over mountains | I'm no expert but I don't think they adjust their altitude. Even Mount Everest only reaches about 29000 feet above sea level, well under your normal cruising altitude. I'd also bet that flight paths are set to avoid mountain ranges as much as possible too |
Why do attachments from email much safer to open in protected view? What does editing a document do to make it dangerous? | Jaks has the right answer. If you open a document for editing, you're implicitly giving it permission to run whatever is within the document, and you have no way to know what that is when you first open it. The document will run with the permissions of the logged-in user, meaning any macro attached to it will be able t... |
Why do human teeth get infected and die off so easily? | I think it's two reasons. 1. You can still survive / eat if you lose half your teeth. So natural selection didn't necessarily weed out this trait. Compare that to your leg, your heart, or whatever other part of your body not working. Then natural selection is basically quickly going to correct that by having that gene ... |
why is rainbow curved? | Rainbows are caused by the reflection and refraction of light by water droplets. For reasons, the reflected and refracted light that creates a rainbow always leaves the water droplet at an angle of 42 degrees from where it entered the droplet. If you are facing a rainbow caused by sunlight then the sun must be directly... |
Where are expirement results posted to? | If you're interested in health research and clinical trials specifically, try _URL_1_ and _URL_0_ .Because you seem to care about spelling based on your edit, some spell checks: Grammar Experiment |
Why does gold run in veins? All heavy metals like this come from supernovas. Why would they concentrate in some position when they eventually make it to Earth? | [Gold veins form instantly during earthquakes.] Gold isn't water soluble except in *incredibly* strong acids, on the surface of the Earth. But deep underground, at extremely high pressure, it can dissolve much more easily. The most current theory is that during earthquakes, the pressure is relieved and the gold solidif... |
If lightning is drawn to metal and the tallest objects in a given area, why doesn’t it always strike airplanes? | Lightning is looking for the shortest distance to the ground. Tall buildings are connected to the ground, as are trees, so lightning will strike those instead of going the whole way to the ground. Lightning wants to go into the ground to discharge the energy it has built up. Aeroplanes are another way for lightning to ... |
If the meteors are disintegrated as they enter the atmosphere, how can spacecrafts get in and out of the atmosphere? | It's not the athmosphere per say that's disintegrating incoming meteors, it's that meteors are going really fast and at fairly steep angles, essentially crashing in to the atmosphere like it was a brick wall. There is a prime difference between bumping your head against something and sprinting top-speed in to it. If a ... |
Why do fans make rooms colder? Wouldn’t faster moving air molecules make a room warmer? | The only way a fan can actually change ambient room temp is if it's exchanging room air with outside air, like having it in a window. |
Why is it rude to ask how much someone’s salary is? | It depends a lot on the culture. Some are open about it while others a lot more secretive. Where I'm from almost everybody knows how much each other makes, though it's becoming less common with the younger generation. Generally, knowing someone's financial situation often leads to immediate judgement, either of envy, d... |
Why, with all our advancements in telecommunications and phone technology, has phone call audio quality stayed virtually the same as ten or twenty years ago? | If you talk about landlines or anything that is talking to landlines: That is a dead technology, don't expect anything there. If you talk about VoIP: That is much better than years ago, with a better sampling rate and wider spectrum they capture. However, that is part of the problem, the biggest problem is the transfer... |
What happens in court when it’s just one person’s word against another? | This is one of the reasons why it's difficult to get a conviction in cases of rape & #x200B; But there are potentially other pieces of evidence--bruises, especially in the genital area, for example. |
Why do Americans talk differently than Brits, even though they emerged from them only a few hundred years ago. | > How can an accent shift so fast within such a short period of time A few hundred years is not a short time when it comes to accents. It's generations and generations of people! It's more than enough time for accents to shift. And remember there's effectively twice that amount of time, because American accents have ha... |
Why can’t a sponge soak up mercury even when submerged in it? | Because the mercury will bind to itself with much greater force than it will bind to the sponge material . So when you remove the sponge from the mercury bath, the mercury clumps together and stays behind. |
why do ordinarily unexciting things become super interesting when one is procrastinating work? | The other day I didn't want to fold my laundry, so I cleaned and folded my brothers laundry. I DONT KNOW WHY! It makes no sense to anyone. Anyway, the other day there was a post about procrastination being about the negative feelings we have for the task, or the results of the task. It's a failure to regulate our emoti... |
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