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What is the slow motion effect we experience during car accidents or other traumatic events?
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I've read that it's not really about increased perception, it's about increased memory formation. While adrenaline does create a heightenbed state of awareness and alertness, time really only seems to slow down in your *remembering* of the event, since your body created detailed memories of every instant of it (a snaps...
Other
how the strong nuclear force works? Why are neutrons needed in the core to keep the protons in place?
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As most probably know protons are positively charged and repell eachother. And neutrons have no charge and are therefore not repelled by protons. The strong nuclear force causes particles to attract eachother e.g. protons and neutons regardless of charge. At short distances the strong nuclear force ist stronger than th...
Physics
What is a logarithmic scale? Why is it more useful for some things than a regular numerical scale?
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Your standard scale will have evenly spaced lines at 1, 2, 3, 4, 5, 6, 7.... A log scale will have evenly spaced lines at 1, 10, 100, 1000, 10,000 Log scales are useful for looking at things that tend to grow exponentially [like say deaths in a pandemic]( URL_0 ), they let you get details at both the lower end and the ...
Mathematics
What would the universe look like after the heat death of the universe? Would rocks remain, or would they have somehow "decayed"?
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Heat death is when literally everything that exists, has ever existed, or will ever exist, has already decayed. Right now, we're pretty darn sure that all matter in the universe is composed of [17 elementary particles]( URL_0 ), where these 17 particles cannot possibly break down to smaller things. The heat death of th...
Physics
Why are people subconciously uneasy or disturbed by corpses even if they know that little harm can come from them?
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Little harm? It's the same reason that most living creatures avoid already dead creatures all over the planet; disease and fear of nearby predators. Disease is a major killer in the wild, and corpses spread disease incredibly easily. Almost all living creatures have an instinct to avoid corpses for that reason. It's wh...
Biology
What is black pen ink made of and what color is it truly?
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So there are a lot of different formulas for black ink and it depends on what medium the color is for. The earliest ink was just burnt carbon and oil. Today inks are mostly synthetic and have a lot of different formulas because black pigment is rather expensive. Some are really just very very very dark brown. Some are ...
Chemistry
What's the complete process of the milk I buy from cow to bottle?
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So Before the cow is able to produce a drop of milk they need to be semenated to become pregnant. Usually this is a job where a farmer strokes a bull for his 'milk' almost positive there was a dirty jobs episode. After the jizz is placed in the Female cow she becomes pregnant, pregnancy/birth creates the hormones that ...
Economics
How much do hurricanes and other major weather events effect the underwater ecosystem?
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Waves don't make a huge impact on underwater species. They go down maybe 10 meters. The problem is the costal ecosystem which can get damaged heavily by typhoons and hurricanes. But normally the ecosystem can reform quickly, due to alot of food being flooded to them. Normally shallow water species can only migrate some...
Physics
Why are some EU member states using different currencies?
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Member states were allowed to determine for themselves whether they joined the *Eurozone* with the collective currency. Many did, some didn't. Criticisms were a loss of control over their own currency, other countries ~~fuc~~ messing it up or in their opinion unfair conversion rates for their own currency to the euro a...
Economics
What distinguishes the different types of light from each other?
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The biggest solid divisions of EM radiation are A) what the average human can and cannot see with the naked eye, and B) what can and cannot cause ionization of atoms. frequencies of EM radiation above a certain threshold are energetic enough to knock away electrons from molecules, and this can cause weird stuff to happ...
Physics
How does squinting helps us see better? Is it psychological? Does it ACTUALLY do something?
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It's the pinhole camera effect. When you decrease the size of the aperture (the pupil in this case), the lens doesn't have to do as much focusing. So, the faults in your lens are less impactful to visual clarity. There's a downside of course. If you decrease the size of the aperture, less light comes in, making it hard...
Biology
Why food get "fridge taste" when they are in the fridge for too long?
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A refrigerator is a closed up box which traps odor, food in the fridge absorbs oder making it tastes bad. So what you need to do is take everything out of the fridge and toss all leftovers. Then wipe down the fridge with a disinfectant cleaner make sure you clean under the vegetable drawers. Now get 2boxes of baking so...
Chemistry
Why is there so much buzz about sleeping early in night? Is the same 8 hour sleep not enough if done in the day instead of night?
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At the end of the day (pun unintended), we are diurnal mammals, which means that we are not nocturnal. Light makes us active. And that's why we need shades, heavy curtains and a dark bedroom to sleep. That's why experts ask us to stop interacting with bright LED screens few hours before going to bed. It's the light sen...
Other
How come batteries can die out without being used just from placing them in a device, but keep their energy stored if not?
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Lots of devices aren't entirely off. They maintain a clock, volatile memory and such. So if you leave the batteries in there is a slow drain on them that isn't present normally. Of course, batteries don't strictly speaking keep their energy when stored. Single use batteries can hold a long time, but rechargeable often ...
Chemistry
How can one audio waveform contain so many concurrent frequencies?
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Basically yeah, that waveform contains all the information needed. You can make any waveform just by combining sine waves at different frequencies and amplitudes, or can do this in reverse and break apart any waveform into sine waves. When an analog signal is recorded digitally, the sampling rate does limit what the hi...
Physics
How do whales not die of dehydration? Do they drink salt water?
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Whales and dolphins don't usually drink water. They can get enough water from breaking down body fat (metabolic water) or through the food they eat. Marine mammals in general do have kidneys that can extract salt much better than ours. Seals/sea lions for example can have urine that is many times more salty than seawat...
Biology
How is the value of a new floating currency determined?
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every morning in the market square they will auction off one forex. however many goats the winning bid is gets translated to their weight in salt and the salt is then sold on the open market. the value of the salt then becomes the price of one forex for the day. this process is repeated at 4:37 every morning.
Economics
Why is brown sugar always "wet"?
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Brown sugar is just regular white sugar with molasses in it, molasses is just really refined cane sugar syrup, and when added together it makes the mixture damp, not necessarily “wet”. You want brown sugar to stay damp for different baking needs and that’s why they are always added in with the eggs and wet ingredients.
Chemistry
if you dont use, you'll lose it. but why do you start to lose muscle mass if you dont use it?
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Our bodies are inherently ~~lazy~~efficient. More muscle mass takes more energy and thus food to maintain. Nowadays, It doesn't mean much since food is readily available. However, our bodies have not changed from the days when food was quite scarce and you were not sure when you will have your next meal. If you have ex...
Biology
What happens during a heart attack?
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A heart attack is a lay term for what is known in the medical world as a myocardial infarction, or MI for short. Infarction means that blood stops going to an area and the area dies from a lack of oxygen, because it is the blood that carries the oxygen. Myocardium is the medical word for the heart muscle itself. Theref...
Biology
How do we know that the stars we see at night are actually still there?
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We don't always, but by looking at the characteristics of stars, their approximate age and how far away they are, we can figure out if it's likely they've 'died' or not. EDIT: Light moves at a certain speed, and if the star is very far away, it takes a long time for their light to reach us. Astronomers and astrophysici...
Physics
What exactly makes something flammable? Like why are rocks not flammable but wood is?
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When something burns, it is reacting with oxygen. The molecules that make it up are being broken apart and combined with oxygen to make other stuff. Wood and organic matter is largely made up of hydrocarbons. These are things that contain a lot of hydrogen and carbon. These molecules can therefore break apart and combi...
Chemistry
When water gets in your ears after swimming in a chlorinated pool, how does it get drained out and not chemically damage the inside of your head?
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Water doesn't get "inside your head" through your ears unless you've got holes in your eardrum. At worst, you get a little stuck inside your ear canal for a while but that will normally drain out and/or get dried up unless you've got some sort of problem. [Here's a diagram of the ear]( URL_0 )
Biology
why would a healthy, modern, growing company, Verizon want to buy an old, outdated (for years), company like AOL?
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While we consider AOL to be a has-been, one of the things you have to remember is these old internet companies own a ridiculous amount of intellectual property, which is worth quite a bit on the patent / IP licensing front. [Looking at what AOL has bought]( URL_0 ), there's a lot of names that jump out at you if you we...
Economics
Why do mood swings occur?
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Mood swings refer to a rapid change in mood. They can occur in women who suffer from PMS or people who suffer from more serious disorders such an major depression, bipolar disorder, ADHD, schizophrenia, or other mood disorders. They can also be caused by thyroid disorders. From my limited understanding on mood swings (...
Biology
Whenever we are embarrassed in public, why do our faces get red? And a get huge lump of saliva in our throats ?
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Well, blushing is due to a release of adrenaline, making your heart beat faster. Same as the fight-or-flight response. Your blood vessels dilate to help this blood flow. Facial veins seem to react to this shot of adrenalin and this extra flow of blood makes your face red. As to why, embarassment triggers this response ...
Biology
How does gravity make time slow down?
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Speed is equal to distance over time. Gravity increases the distance light travels as it curves space. The speed of light is constant no matter where you are and no matter how fast you're going. So, if the speed of light is fixed and the distance increases due to gravity then time has to slow to make sure the equation ...
Physics
Why is a crowd cheering any louder than one individual shouting, if everyone is shouting at the same volume?
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You know how when you're in the bathtub and you're splashing and it makes a wave in the water and then when it ripples back to you, you're still splashing around and the wave gets bigger? Sound travels in waves, and when those waves are stacked on top of each other, like in a crowd, the size of the waves get bigger and...
Other
Why can a rapid decompression suck you?
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There's lots of air molecules inside the ship. There's almost none outside the ship. We've found that gases like air want to be spread as evenly across the universe as they can as long as nothing stops it, like gravity, or the walls of a spaceship. So you punch a hole in the ship and all the air inside wants to go outs...
Physics
Why and how does fire technically have a shape? I don't understand the reasoning behind the border between air and fire.
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Fire as you think of it is what happens when a gas burns. Even wood fire - the wood is heated until it breaks down and releases flammable vapor. Only the coals are actually a solid burning. The inside is the gas, the outside is air. On their own, neither can burn. When they mix, at the surface between them, you get fir...
Chemistry
How are victims of severe starvation (such as holocaust survivors), safely brought back to a healthy weight?
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In an ideal clinical setting, a person with malnutrition will be monitored very closely for changes in electrolytes. These electrolytes, usually potassium, phosphorus, and magnesium in particular, will probably need to be supplemented. Thiamine (Vitamin B1) should also be supplemented. Fluids should be monitored and ma...
Biology
We know the universe is expanding, but where is this new space coming from?
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Ok, imagine this. You've got a big lump of chocolate chip cookie bread dough. That is, there's dough, and in the dough is chocolate chips. You put this ump of dough in your oven, and you cook it. As it cooks, it expands, okay? The lump expands in all directions, to become a bigger lump of bread. Inside the lump, as it ...
Physics
Why do some contraceptives impact women so differently?
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The concept of these contraceptives is to make a very small change in a very complicated system. Sensitivities and hormone reactions vary widely from woman to woman, as her individual systems reach balance through puberty. The problem with "one size fits most" solutions is that it is very difficult to predict the react...
Biology
Why is the tip of the human nose made of cartilage?
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The actual reason, although rather vague, is that natural selection leads to traits that are more advantageous for survival to be selected for and thereby become more prevalent in a population. So having a cartilaginous tip to the nose allowed for better survival to reproduction. Probably because the nose sticks out re...
Biology
What causes people to become less flexible?
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Flexibility comes from our ligaments and tendons, the fibers that hold our muscles together and anchor them to our bones. Over time, they start to harden. Your genes only care about you as long as you can reproduce. There's no incentive to maintain the body past a reproductive age, so we start to deteriorate. Presbyopi...
Biology
how do telescopic sight or scope in sniper rifle work? The scope is few inches higher than the bullet line so how are the bullet hit the mark in the scope?
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[Here is a helpful diagram]( URL_0 ), that shows an exaggerated view of what's going on. Bullets don't travel in a straight line, despite what it might look like. They travel up and then down in an arc, called a ballistic arc or path, just like throwing a football. Light on the other hand, for all intents and purposes,...
Technology
How does hitting a beer bottle with the bottom of another beer bottle make it foam up?
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Beer contain Carbon Dioxide, a gas. This gas is either dissolved into your beer or is trapped into bubbles. Carbon dioxides are fines with being dissolved but what they like even more is getting into bubbles, make them grow so they can float and escape to the surface. Unfortunately there's not enough bubbles for everyo...
Chemistry
How does Newton's 3rd law work?
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The bus is indeed being hit by the same amount of force that you are. What you're missing is that a bus is far more massive than you are, so that amount of force affects the bus proportionately less. This is because of Newton's Second Law, which says F = ma. So, suppose you weigh 90kg and a bus weighs 15000kg. That mea...
Physics
How does peeing on a jellyfish sting help make it better? (Or whatever it does, I really don't understand).
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It doesn't. Peeing on a jellyfish sting is not only ineffective and gross (unless you are into that sort of thing I guess) but may even make things worse. You are better off putting some vinegar on it, rinsing it with seawater, covering it with shaving cream or sand, then scraping it with a razor or credit card. Altern...
Chemistry
How would we know if we’re seeing a color for the first time? How are new colors created?
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We actually have [colour databases]( URL_0 ), which colour scientists check to see if a colour they made already exists. If it doesn’t, boom, new colour. To most people, these don’t look like new colours, because they are all variations of colours we are all familiar with like red and blue. > How are colours made? New ...
Chemistry
Why do clouds flatten out on the bottom side closest to the surface, yet have such tremendous shape variations everywhere else?
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They don't flatten out as such, which suggests they're hitting something and spreading after falling. It's the other way around: the water vapour that forms the cloud rises until it reaches a level (which is relatively flat) where the air is cool enough to make it condense into visible water droplets (ie a cloud). It t...
Biology
When clay hardens can you re-soften it by adding water? how did cave men use clay to build structures in the olden days
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Oh hey, something I know a bit about: Clay can be remixed with water to be "reclaimed" up until the point that it is fired. Once you expose it to enough heat to completely dry it up and vitrify parts of it so that it is more sturdy, you can't remix it with water to make it into a workable state. If he just let it dry, ...
Chemistry
Why are some letters given different symbols depending on case whilst others are simply changed in size?
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Upper case and lower case letters actually evolved from two very different versions of the Latin alphabet. Capital letters have remained almost unchanged for 2,000 years, and [Roman inscriptions are still very easily readable today]( URL_1 ) (if you know Latin). This version of the alphabet had lots of straight lines a...
Other
Why is there only a single common ancestor for life? if it happened once couldn't it happen again?
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Your question is pretty vague, but I am going to assume that you're asking if we have any proof that all current life branched off from a single starting organism, rather than multiple organisms over time. The most conclusive evidence of this is the existence of the [genetic code]( URL_0 ). In short, the genetic code i...
Biology
How does a car radio know the name of the station, and the song playing ?
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There is a standard for this called the Radio Data System. It is a low bandwidth data signal that is sent on the audio but at three times the frequency of human hearing. So people can not hear it but a chip in the radio will be able to decode it. There is not much bandwidth but it is enough to transmit some simple text...
Technology
Why is there is so much oil in the Middle East?
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Realize that what the area looks like now has no effect on the deeper geology or the presence oil. Why the Middle East? It has to do with what that area looked like 145 to 200 million years ago during the Jurassic period. At that time the Middle East was largely a shallow ocean that was fed by many different rivers. Ov...
Chemistry
How are companies that are non-profitable so massive/successful?
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Uber generates a ton of revenue, and reinvests that revenue back into itself in order to grow market share and improve services, features and hiring lawyers. They may not create much in profits yet, but the company is creating value for investors as it continues to grow. At some point, the growth curve will level off. ...
Economics
Why are computer CPUs so small? Wouldn't it be beneficial to make them bigger?
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Electricity takes time to travel through wires. If you want to make a signal go to a bunch of different points quickly then you need to put those points closer together. This is what CPU designers are doing; by making their components smaller they are able to cram more points into a given area and achieve more without ...
Technology
If I buy a steam giftcard from GameStop, who is actually profiting?
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Gift cards are typically "sold" to stores below face value, and the retailer of the card gets some cut of the proceeds for the card sale. I can't remember if steam handles the distribution of their own cards or not, but many gift cards are produced and/or distributed by a third party who may handle cards (and part of t...
Economics
What does a 4-D Cube look like?
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A hypercube looks like a regular cube to our eyes which only see in three dimensions. You can do a Google image search for hypercube and they can show you some sketches illustrating the concept. Certain tryptamines, especially dimethyltryptamine, may briefly give you the experience of perceiving them but the images are...
Mathematics
How can a multi-level marketing company not be considered a pyramid scheme?
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Listen to the podcast The Dream. It’s an MLM exposé and very well done. The reason MLMs aren’t considered pyramid schemes is that they’re very dedicated to lobbying politicians and running Chambers of Commerce to keep them from being categorized as such. That’s it. The co-founders of Amway (the Devoses, as in Betsy DeV...
Economics
Will cancelling my oldest line of credit negatively impact my credit score?
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If you are in good standing there should not be any reasonable damage. Credit cards report your reliability. Canceling your agreement when you’re not in debt, and have no remaining payments shouldn’t interfere. However the ideal is to buy something with it. Even if it’s just groceries. Continued payments look better th...
Economics
Why are nocturnal animals attracted to strong lights? Shouldn't they fear them, like then diurnal animals?
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Well, with moths, specifically. Their tiny little moth brains use light to navigate (the moon, basically). With the introduction of artificial light from us, the moth cannot navigate properly and is confused on which big shiny thing they should follow. So eventually they end up smacking their little moth faces against ...
Biology
Why does it hurt so much when guys get kicked in the balls?
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Because, evolutionarily, the only real goal you have is to have babies. and as a man to do that you need your testicles. Therefore, to encourage men to protect their testicles dearly, evolution lead to the testicles being very sensitive to any kind of possible damage/pain. So something that can really do damage, like a...
Biology
I've heard that soldiers during World War 1 played soccer together on Christmas. If this is true, how did hostile soldiers know that they were coming over for a game of soccer? Did anyone get killed by mistake? Were leaders willing to allow this? Didn't these soldiers hate each other?
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This is known as the Christmas truce. There is a lot of evidence supporting the fact that at several places along the western front on Christmas day 1914 the soldiers initiated a truce and some places even started to mingle. At this point in the war the soldiers had just been through 5 months of war and were experienci...
Other
Why is it that some people struggle to remember simple things (names, dates, conversations, etc) yet are able to categorically memorize more trivial things (the periodic table, sports stats, world capitals, etc)?
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I'll be interested to see what sort of answers you get from others actually knowledgeable in this area but I recently took a genetics test and was surprised to learn that there are some suggestions that specific genetic markers can indicate what kind of memory performance you have. For instance, I was found to have the...
Biology
How has the previous generation “ruined the housing market” for millennials?
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The short answer, we don’t make as much money as they did. Slightly longer answer: US household median income in 1970 was $9,780 which has a buying power of $64,700 in today’s money. The current median US wage is 61,800, about $3,000 less or effectively 5% less money available per year than they did. Next, median home ...
Economics
Why does a good amount of painkillers help with inside pain but not outside pain?
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I think this is related to the fact that painkillers such as Ibuprofen and Acetominophen (two main ingredients in Midol) stop or block your body's transmission of pain: > When you take a pain reliever like ibuprofen, it keeps injured or damaged cells from making and releasing prostaglandin. When the cells don't release...
Biology
Would a gallon of water weigh the sams as a gallon of ice?
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Your subject and the text in the post ask two difference questions, > Would a gallon of water weigh the sams as a gallon of ice? > I mean if you take a gallon of water and weigh it, then take that same gallon of water and freeze it. The subject is a gallon of water and a gallon of ice, That is not the same as if you fr...
Physics
If you try and speak in really strong wind, are your words literally being "blown away" or can people just not hear you due to the wind noise?
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As most of the answers here don't explain what actually happens I thought I'd give it a go. The reason this happens is due to the refraction of the sound waves. They refract as the wind speed increases with altitude, so even in strong winds, the wind speed at your feet is practically 0. This effect in a headwind causes...
Physics
Why are instruments chambered to different keys? For instance, a clarinet is chambered Bb, whereas a flute is C, or concert pitch.
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This is interesting and complicated, and involves a lot of history for each of the instruments. Here are some simple explanations for why you see this today. \- Historically, instruments such as the clarinet did not have as much sophistication in their design, and were not able to play as wide a range of notes. Instrum...
Other
Why do medications that control seizures also treat bipolar disorders?
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I want to know the answer to this one too as I'm on one! Even my doctors have admitted that they don't truly understand why they work. Good news is, because it works so effectively, studies are and will be conducted so I reckon we'll have an answer in a few years time. Hopefully.
Biology
How do logic gates work?
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MOSFET Transistors have 3 Pins, the source, drain and gate. When a voltage is applied across the gate, the area between the drain and source is depleted of electrons, creating “hole” charge carriers. Basically, imagine a highway between two cities jammed with traffic. I open up an exit, some cars leave the highway. The...
Technology
- Why do they say you can ‘sweat’ the commin cold or the flu out when unwell?
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Because they don't know what they're talking about. Fevers may be useful for combating some bacteria, but will not do much against the common cold or flu, which are caused by viral infections. People say this because they get sick, feel like shit, sometimes feel feverish or sweaty (though usually only lower grade fever...
Biology
Why is the instant reaction to getting hit with cold water to take a large breath in?
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This is part of the Mammalian Diving Reflex. URL_0 URL_1 > When the face is submerged and water fills the nostrils, sensory receptors sensitive to wetness within the nasal cavity and other areas of the face supplied by the fifth (V) cranial nerve (the trigeminal nerve) relay the information to the brain.[1] The tenth (...
Biology
Why does shampoo not lather up well when you shampoo for the first time in a while?
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My sister told me a long time ago that dirt is the enemy of suds and that stuck with me. But it's basically true. Your hair has oils that are important to its structure. Those oils allow dirt to cling to it. Shampooing strips away those oils and thus the dirt. but remember dirt is the enemy of suds so you won't lather ...
Chemistry
How does infrared work in mapping the heat of things (like with thermal goggles) since it's just a form of light?
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All objects glow. The amount and 'color' of their glow depends on how hot they are. Really hot things can glow red or even white. At room temperature, things glow mostly in the far-infrared range instead. By measuring this glow, which is invisible to humans, we can measure the temperature of a thing. Edit: We actually ...
Physics
What will happen if we keep wasting water?
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Our groundwater is already being used at a rate much faster than it can be replenished. We'll need to rely on desalination in the future, which at the moment is very expensive and energy costly. Not to mention the transport of that water to inland areas. There's a reason why companies are buying up water rights left an...
Earth Science
Why do so many car commercials try to appeal to viewers emotionally rather than advertise features of the car?
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Because that's how advertising works best. Human decisions are built on emotions and how you view yourself more than on logic. A lot of the psychological theories used for advertising are based on the theories of freud and the subsequent work of his nephew, Edward Bernays. EDIT: for more try here : URL_0
Other
why are eletric cars less harmful to the planet than oil cars?
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Simple reason: they burn gas for for fuel. Many and most companies don't use coal for fuel anymore so the energy from grid electricity is cleaner than by an internal combustion engine. Nuclear, hydro and green power technologies make these sources of power much less of an emitter of greenhouse gases. Even power that is...
Other
Why does 60 degrees outside feel completely different from 60 degrees inside?
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Because temperature alone does not account for things like the sun heating up your skin, wind, humidity and various other factors. There are many different ways of measuring how hot or cold it feel heat index which takes into account humidity and global wet bulb which takes into account other factors like the sun's int...
Other
why does cheese come in wheels and some other brands come in blocks?
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Most 'rind' cheese, cheese that naturally forms a harder/protective exterior, comes in wheels because that's a good shape to get more cheese inside less rind. The rind is edible but not generally considered good eating. The wheel shape is a nice compromise between an easily transported shape and volume/surface area. Al...
Economics
How do fighter jets detect that they've been locked as a target of a missile?
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Ooh! Finally! A question I'm 100% qualified to answer! ELI5; a radar is basically what you get when you put a radio on the Steve Rogers super serum. It detects and tracks targets by sending out a ridiculously powerful pulse of radio energy and listening for that energy bouncing off of an airplane and back to the source...
Technology
How do square rigged ships sail in upwind? Can they at all?
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It is called tacking, you can alter how the sails "catch" the wind, so can push you from side to side rather than in a single direction Sails actually work best when the wind is on the "quarter" rather than directly behind them so all the sails are being pushed. By tacking you can slowly in general head into the genera...
Physics
Difference between NAT vs ARP?
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> both protocols translate requests from a public facing IP (say from a router) to the device on the network that requested it. This is wrong, actually. ARP is used within a network; NAT is used for cross-gateway (local network to Internet) traffic. The Address Resolution Protocol is how a computer determines another c...
Technology
did we invent math or discover it?
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A bit of both. There are 2 philosophical schools of thought about numbers. One, any intelligent being will understand numbers. There's something obvious about the idea of 3. Two, certain parts of math were clearly invented. Like calculus. Ideas like the square root of negative 1, isn't even a real number. But it critic...
Mathematics
Why does ice reduce swelling?
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Your body restricts blood flow to cold parts of your skin to conserve heat. When you dramatically cool down your skin with ice, your body reacts as if it's in a cold environment and constricts blood vessels flowing into that area as if to conserve heat. Swelling is the result of blood vessels dilating to bring addition...
Other
How do floods like Houston flooding happen with all the modern technology and drainage systems we have? How do they even happen?
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Finally, something in my wheelhouse! So, I'm a civil engineer, specifically I do surface water management - so I design culverts, ditches, dams, other water management structures. There's a concept in hydrology called "Return Period," and it's another way of looking at the probability of an event. So if you hear people...
Technology
Why are nut allergies and gluten intolerance so prevalent and serious in certain populations (like in much of the US), and negligible to the point of being even considered a myth in other parts of the world?
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It’s most likely that the rate of reactions in the population hasn’t increased but the social awareness, rate of diagnosis, and restricted diets limiting exposure has seemed to increase the number and severity. For most of human history something like a food allergy wouldn’t even have been a consideration because of th...
Biology
why flying takes so much out of you physically and mentally when you haven't done anything but sit there?
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A few reasons. First, airplanes are pressurized to an altitude above sea level; usually between 6,000-8,000 feet. This means there's not as much oxygen as at sea level. While it's not enough of a decrease for you to be aware of, it does tax your body a bit more, especially on longer flights. If you've ever done any hik...
Biology
Why can we not access all of our memories?
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If you have a library of 5 books, it may be small, but you know where those books are any time you need them. If you have a library of 1 billion books, good luck finding the one you need. It'll take a lot of time. That's basically it. While it'd be nice to have infinite memory, 1) where would we put it? 2) it'd take fo...
Biology
Why doesn't the flame on a candle just burn up the wick and go out before the was melts?
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The wick does just that, it wicks up the melted wax which is actually what comprises most of the fuel for the flame. Which is why the wick itself burns so slowly. And as the wick grows too long and charred that section can no longer absorb the melted wax from further down so it slowly shrinks down the candle as the wax...
Chemistry
How do people determine if X poison/venom is 10 million times more harmful than Y poison/venom?
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/u/Bigted1800 is indeed correct, but that's not really a complete definition. For toxicity, there's so many factors that come into play that it's really hard/unbelievably unethical to test for, so we use something called the LD50. That's the Lethal Dose 50% number, i.e. *this* amount will kill half of people exposed to...
Biology
What is the legal reason that a president might not be able to be prosecuted?
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Well, there is no legal precedent to indict a sitting president because it has never happened before and there is nothing in the constitution that provides for this. Ultimately it would be the Supreme Court that would have to decide. Oddly enough they are trying to fill an opening in said court and ultimately Trump (wh...
Other
What are derivatives in Calculus and where could one actually use this in the real world?
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Derivatives in calculus are formulas for the rate of change of a function. If I'm walking 1 m/s in one second, 2 m/s in the next, 3 m/s in the third, one could describe my speed overtime as 1*t where t is the number of seconds I walked. The derivative of this function (1) is my acceleration, or the rate at which my spe...
Mathematics
How do interest rates affect the economy?
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Interest rates affect the cost of borrowing. Contrary to popular belief, central banks do not control interest rates. They try to regulate the money supply to influence them but ultimately the market sets the rate. Interest rates are a function of many things. How much money is available to lend, how much risk there is...
Economics
What are network ports and how do they work?
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If you think of your computer as an apartment building, you can think of ports as the apartment numbers. You order a package (data) to the building (your IP), it needs to know which apartment it goes to (200). It gets more complicated. Like some apartment are designated (by default) to receive certain things like pizza...
Technology
Why is it that playing a PC game at 30 FPS looks so bad, yet playing a console game with a 30 FPS cap looks buttery smooth?
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There would be a lot of factors that could cause it to look less "buttery smooth": Typically console games will be optimised for 30fps on that platform. So when playing a game like GTA , there will be a standard graphics setting that will work the same for every console. Each console is practically identical at this po...
Technology
Why do we sometimes get unexplained VERY long hairs in random place on your bodies?
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Hair follows "growth cycles" where they grow and then go dormant for a bit before growing again. Sometimes individual hairs break out of the cycle and just grow constantly, forming a long hair faster than it is worn down. They are otherwise normal hairs which are just stuck on grow for some reason.
Biology
Why does bottled water contain sodium?
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Unless it's been distilled, then sodium \(and other ions\) are pretty much always present in water. Depending on where the water came from, they could have been absorbed from rocks or soil that the water touched, or from contact with living creatures like plants or animals. Sodium dissolves in water very easily, so if ...
Chemistry
Why are native Australians so different from Native New Zealanders?
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The aborigines in Australia were there for a very long time and it’s theorized that they were some of the original waves of people to leave Africa through India and Island hoped to eventually end up in Australia. The Maoris from New Zealand are Polynesian and only arrived in New Zealand in 1300. Thousands of years afte...
Biology
Does a fruit gain calories as it ripens due to the production of sugar?
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To some extent yes, it does. It doesn't really 'gain energy' because that's unpossible but it does convert fiber and nutrients into fructose and glucose which are easier to digest and therefore give you more calories. I'm not sure if they convert cellulose to sugars but if they do that would be directly gaining calorie...
Biology
Why do some bank and payment processes still take 3-5 days to complete?
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A live person at the bank has to verify certain transactions, which usually involves talking to another live person at another bank or branch. Combine that fact with the workload of large banks, which process god knows how many transactions daily, and the fact that most bank employees have to split their work day betwe...
Technology
Besides color, what is the difference between salt, sea salt, pink Himalayan salt, and black lava salt?
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OK, let's start with "salt", which when we're in the kitchen is NaCl - Sodium Chloride. Common table salt often has iodine added to it, commonly in the form of potassium iodide. This prevents goitre, and alters the taste. Also, since salt absorbs water from the air, most of the time an 'anti-caking agent' is added (may...
Chemistry
How are hard drives/sd cards/digital storage nearly doubling in storage capacity, while remaining roughly the same size, year over year?
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Digital storage capacity has nearly everything to do with storage *density*, or the number of bits that can be stored per unit area. Imagine you have 100 light bulbs, and they can be switched on and off individually via a set of switches you have. Each bulb represents a bit of information (on/off). Say it takes up a sq...
Technology
Why does building muscle not equal strength? Eg. High volume for hypertrophy/building muscle vs. Low reps for strength. Whats the difference exactly?
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First things first. There isn't a line drawn in the sand for hypertrophy vs strength building. They go hand in hand. What you can change is which one you focus more on. Hypertrophy (muscle fibre enlargement) not building new muscle fibre (hyperplasia) is said to be best targeted at around 8 to 12 reps. Strength is basi...
Biology
How can you prove that you can't prove something?
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Keep in mind that when we say a proposition "can't be proven", we mean that it can't be proven in one particular system. It's always possible to make a new system that can prove the original proposition. Usually, to show that something can't be proven, you find or construct two examples of your system; one in which you...
Mathematics
in chemistry, what's the difference between "-ite", "-ide", and "-ate"?
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-ide is typically nonmetal compoundes (sodium chlorIDE). -ate is an ion with the largest number of oxygen ions, while -ite is used for a smaller number of oxygen ions (NO2 = nitrite NO3 = Nitrate) For more fun, lets look at chloride: Cl = Chloride ClO = HYPOchlorITE ClO2 = chlorITE ClO3 = ChlorATE ClO4 = PERchlorATE ED...
Chemistry
Why does Microsoft care so much about people using Edge?
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Your user data is a valuable advertising tool, directed ads are *worth money*. You may recall that a law was passed saying your isp gets to sell your browsing data.. **Google has been collecting that kind of data for years!** That's why you get targeted google ads. If you search for a new deep fryer on google, then you...
Technology
How exactly do 'low-cost' airlines make money?
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Lower amenities. Some pre-purchase fuel to better control costs. Often they fly a single type of plane, which means mechanics, parts, pilot training, etc.... is streamlined. Southwest Airlines is considered one of the best low-cost carrier success stories. They don't have assigned seating, don't list inventory in many ...
Economics