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Body Parts falling asleep; lack of oxygen or blood pressure too high? | > lack of oxygen or blood pressure too high? Neither. It's caused by compression of nerves to/from the affected limb, effectively cutting off communication between the limb and the brain. The "pins and needles" feeling is caused by the sensory neurons restoring their electrochemical gradients once the pressure is remov... |
I just had a full length dream about an insignificant person from school I talked to maybe once. Why is this? It's been 12 years | I'm not an expert in Psychology, but this can be answered with basic fundamentals. We believe dreams are your brains way of catagorizing and storing memories. This could be anything throughout your life. Think of your dreams as a collage of memories. Take someone you met 20 years ago, add that to a volcano documentary ... |
Why does the combination of cigarettes and coffee seem to be a natural laxative? | Coffee *is* both a laxative and a diuretic, it doesn't just 'seem to be'. |
Why is it so hard to find a free toilet in most European cities? | I would guess probably to keep homeless people from sleeping inside or druggies from shooting up in the bathroom or trashing it. I'm not super knowledgable about this but to me it seems like they charge a small amount of money to ensure proper care for the facility because who would pay money to trash a bathroom. |
In finance, what does it mean when an investment group "bets" on an outcome? | A source would help, but I think I can be fairly certain that "bet" in this sense was just a euphemism. That's all investing is, really. When you invest in something, you're taking a calculated risk that it will pay off. Nothing is certain. It isn't exactly gambling in the sense that the payouts are not up to random ch... |
How come when I sing along with a song I sound awesome but when you take away the vocal track I sound ridiculously horrible? | I think your ears are blending the two voices. It also might be that you feel more confident in singing it with the vocals. Two things I do to tell how well I'm really doing: first, gradually decrease the volume of the song, but keep your singing voice the same. Second, take a finger and plug one ear while singing. It ... |
what does a military or terrorist organisation gain by shooting down a civilian plane and then denying it? | Because they didn't intend to shoot down a civilian airliner. They thought they were shooting down a Ukrainian military transport aircraft. No one has anything to gain from shooting down a bunch of civilians. That's why they are attempting to deny it.Imagine you are playing baseball in your backyard with your brother. ... |
Whats the point in war? | You have something I want. I shoot you and take it. That's robbery. You and your 99 friends have something me and my 99 friends want. We shoot you and take it. That's war.To quote von Clausewitz, "War is the continuation of politics by other means." It's quite a broad stroke, but it does open the eyes to some aspects o... |
why is a lieutenant general Senior to a major general? It seems backwards because a major his senior to a lieutenant. | The rank of Major General is a shortened title. Historically it was Sergeant-Major General. Somewhere along the way in the 18th century, the sergeant part of the name was dropped. It could easily have been the major part that was dropped and that would have made more sense. Sergeant-Major means "sergeant-leader" or "gr... |
Why do people in war movies always not seem to notice their excessive sweating | Well I'd imagine there are greater worries than how much you are sweating such as surviving. And since many of these movies take place in hot climates they just got used to sweating heavily all the time.Also after living in 100+ degree heat and working in it for months at a time you get used to sweating. Hot AF + walki... |
In US TV and film why do people always seems to chew tablets | It's cinema short hand for someone being a bad ass, or an addict depending on the situation. An addict may chew time release pills in order to get all of the high at once, and a bad ass might chew pills because they're too cool to suffer visibly but they're in severe pain and want the medicine to kick in now. Addicts c... |
How does a paint roller hold so much paint? | It's literally a sponge, but for paint. The paint roller is full of tons of little holes that the paint goes into. This is why most sponges are very squishy, they're mostly air. |
Why Does Plucking My Eyebrows Make Me Sneeze? | Plucking my eyebrows doesn't make me sneeze, but pulling out nose hairs does. I'm purely speculating, but I would imagine your body thinks there is a foreign object causing pain, and so your reflex is to get it out. A sneeze can be measured at 100mph/160kmh. So, a sneeze is pretty effective at removing what the body re... |
The current fracturing of the Republican Party. | The GOP currently has two main factions: the Tea Party and the Establishment. The Tea Party is a minority, but also represents a fairly large and well-funded faction. And they are large enough that the establishment Republicans can't simply ignore them. There's also a lot of Establishment Republicans who are sympatheti... |
When getting a tattoo, how come the ink from the stencil or pen doesn't contaminate the skin? | I have 6 tattoos from 4 different artists and have never seen anyone freehand with a sharpie on a person and tattoo on that. |
Why does it seem like I have to change my deodorant brand every year or so to avoid body odor? | The smell that emanates from your armpits is largely caused by the bacteria that makes its home there. Deodorants, in addition to smelling pleasant, discourage bacterial growth. Over time bacteria may grow resistant to some extent if you always use the same type of deodorant. Occasionally switching can help combat that... |
What is the technology and strategies involved in developing and marketing a triple A game? | Hop over to r/gamedev for a better answer. Almost everything can be found in their guides. On the development side, there are 3 types of developers, Artists, Programmers and Designers. There are more roles but lets focus on the main ones. Strategy wise: Artists develop what you see, from concept art to 3D models. Progr... |
Why can't I just eat gummy vitamins, protein supplements, iron supplements, etc. and survive? | Apart from the supplements lacking many vital components that are found in actual food, the rate at which you absorb the vitamins and the rate at which the actual solids pass through your body do not allow for adequate intake of the nutrients. Eating just supplements and not any solid food will just give you very nutri... |
How do boats like this stay afloat? | Pretty sure the have hydrofoils on the fins, wich work like an airplane wing only with water. Essentially creating lift and allowing them to glide above the waves. It probably helps that the entire boat is made of carbon fiber and other lightweight materialsIt's not witchcraft, but it's not really floating either. Esse... |
Why in the United States, with the exception of soccer, are there not sponsors or advertisements on professional sports team's uniforms? | Soccer is played without any breaks during either half. Because the clock never stops running, there is rarely an opportunity for television broadcasters to play commercials. Jersey sponsors are a way to earn revenue in spite of this constraint. American Football, baseball, and basketball by contrast have many breaks a... |
How come when I punch in my dreams, it feels like I am punching underwater? | As answered [here], > It's because punching is a highly-coordinated activity that relies on proprioceptive feedback throughout the motion to work. Since the thalamus clamps down both on the transmission of the motor signals you'd need to effectively complete the motion and the perception of joint-motion data while you'... |
As an Australian, what do the words "middle class" v. "working class" mean in America? | Kind of. There are really thee kinds of middle class: lower middle, middle, and upper middle. Lower middle is probably what you would call "the working class." The middle class is a household with bachelor's degrees and what not . They are the "American dream" families: the white-picket fence, 2 kids, steady jobs, etc.... |
Why are some instruments (presumably) harder to synthesize than others? Why do, say, MIDI pianos usually sound better than MIDI horns? | Pianos make noise one way- by hitting a string with a hammer. You can control how hard or soft you press the key, but you can't change anything besides that. Brass instruments derive their sound from the vibrations of your lips, which have far more minute detail and control which is extremely complicated for a computer... |
If bruising is the body's way of protecting itself, why do we try to reduce swelling when treating an injured person? | Bruising is not the body's way of protecting itself. A bruise is the result of a trauma that ruptures capillaries/blood vessels. The resulting swelling is blood "leaking" into the surrounding tissue. The treatment for swelling is applying something cold to the bruised area. The cold causes blood vessels to constrict wh... |
What is the white foamy stuff when you put Hydrogen Peroxide on an infection and why does it become foamy? | There are enzymes in your blood that attack the peroxide and turn it into water and oxygen. The bubbles are what that looks like. As a sidenote, though, you should **not** put peroxide on wounds. It kills germs, but it kills everything else it touches, too, including healthy tissue. And since you have a cut you're lett... |
Why wind speed on land is measured in mph while wind speed on the ocean is measured in kn(ots) | Using knots as a measurement makes sense on the ocean. 1 knot is 1 nautical mile per hour. 1 nautical mile also represents one minute of longitude at the equator. When sailing was easier to use knots to determine distance traveled when using a chart. One degree of longitude is 60 nautical miles at the equator. The math... |
why isn't inflation in America based on bread/sugar (past) and why is it based on things like price of iPad (present)? | Well, it's based on all of those things. It's based on what the average consumer buys and then it's the percentage difference in price between each good. However each good has a weighting on how important they are, bread and sugar being more important than iPads. A rise in the price of bread and sugar leads to a greate... |
How do dogs smell/sense a persons they know without seeing them? | Dogs also have really good hearing it could be anything from the particular sound of their car to the rustling of keys. Dogs are very good at recognizing certain patterns. |
the OJ Simpson trial and why it was a big deal | 1. It involved a celebrity2. It involved a black man who was accused of murdering a white woman, lots of racial tension3. Despite overwhelming evidence, a team of very expensive lawyers were able manipulate a less competent prosecutor and judge, and allow their client to get away with murder4. Both before and after the... |
What does it mean to 'take the 5th'? | The American constitution codifies what rights the citizens of the country are entitled to. Written up in 1789, the Fifth Amendment of this constitution consists of the following: > No person shall be held to answer for a capital, or otherwise infamous crime, unless on a presentment or indictment of a Grand Jury, excep... |
How do I set the office thermostats to make the most number of people happy? | Set it cool to keep the men happy, hand out sweaters to the females.It's better to be too cold than too hot, since you can just put on another layer. Also, heat makes people sleepy. |
What is the technical difference between home video, reality TV, TV drama, sitcoms and movie film? | Home video is made by people showing other people they know or their own activities , and is generally to be shown to only people they know. Reality TV shows are TV shows that show people who aren't paid actors and who are not told what to say. TV drama shows people who aren't real. They are actors pretending to be som... |
Why power buttons on power strips say "off" and "reset" instead of "off" and "on" | That is a surge protector, not just a power strip. Reset means "reset the breaker", like if too much power goes through it it'll turn off but if you flip it on and off again after fixing the power issue it'll come back on, instead of being just a fuse that breaks once and is dead. |
Why doesn't the world have a global currency? | This gets asked an awful lot - [please use the search function for a complete answer]. The short version is it would involve relinquishing sovereignty, and we can't really get the entire world to agree on *anything*. |
Why do certain foods like pancakes or cake icing taste amazing at first but quickly become disgusting after I've had a certain amount? | Food scientists have found there is a "bliss point" at which food tastes the best. It's a particular amount of sugar and fat. If you consume it for a certain amount of time, then you'll become sated and not want any more. This is not good from the perspective of food companies, who want you to keep eating more and more... |
ELI'veonlyexperienced1season: How does the 4 seasons feel like? | In New Jersey, our summers can get up to around 37C, and our winters can get to -17C. Spring and fall are basically the perfect temperatures but you're really only missing out on one season: winter. And you're not missing out. |
What's the difference between singing and speaking and are you actually producing a note when you speak? | There is no difference. Singing is just speaking in a different pitch. If you look at languages where the pitch of the pronounciation affects the meaning , the music in these languages have lyrics written in a way so that the spoken lyrics follows the song's progression. If you read these lyrics out through normal spea... |
Why do my balls (crotch area) have a distinct smell to them? | Bacteria multiplying with moisture retention, said bacteria creating odor as its trapped in hair follicles And friction from movement continuing to keep the conditions favorable for bacteria to thrive/ maintain comfortable existence. . |
Is it possible to become physically addicted to weed? | No. Marijuana is not physically addictive, but it is possible to become psychologically addicted to it.Just to elaborate on /u/99999999999999999989 's answer, physical addiction means you will suffer noticeable physical symptoms when you withdraw, such as the tremors for alcohol addiction, or immense physical illness f... |
How can 0's and 1's tell different pieces of hardware in a computer to do certain things? | 1 and 0 correspond to "voltage" and "no voltage" on a hardware level. So, for example, when "1001" is stored in RAM, it's put in a bank of four capacitors, which go The voltage can then be used to control transistors, which act like little switches. Lots of transistors together can be used to build logic circuits, whic... |
Does an ad blocker prevent your bandwidth from being wasted on the ads? | Normally, an ad blocker works by blacklisting certain domains, so that stuff embedded from them isn't even loaded. So yes, they do save bandwidth. |
What is happening in California that is causing such a lack of water? | Basically: California gets its rainfall from the ocean. The ocean has been giving less, just as there is escalating demand for water from cities and agriculture. The ocean is providing less rain because of a persistent high pressure "bar" off the coast of California preventing rain clouds from forming. This high pressu... |
Why were there so many big supporters of eugenics in the early 1900s (e.g., Tesla, Churchill), and what changed from then to now to shift views on the subject? | The main reason eugenics fell out of favor is that the people carrying it out were worse than the people they claimed were sub-human. The things the Nazis did ended up convincing just about everybody that eugenics was something only a crazy person would believe in. Eugenics doesnt purify anything, it only kills everybo... |
How did Pakistan end up with nuclear weapons? | Pakistan got its ass handed to it in the Indo-Pakistani War of 1971. They ended up having to sign a humiliating surrender, much like Germany post WWI. Pakistan was livid over it, and wanted to put itself in a position where it never had to surrender again, so they invested **a lot** of money and manpower into making nu... |
Why does eating the same food everyday make it taste bad after a while? | Humans are omnivores. That doesn't just mean we *can* eat a wide variety of foods, it means we *must* eat a variety. Every evolutionary advance, it seems, is a compromise: in return for being able to eat many foods, our bodies don't produce everything we need - the missing ingredients are vitamins and amino acids. To m... |
Why does everyone have to die? | There's a timer in the cells that make up your body called [the Hayflick Limit]. They can only repair and replicate themselves a set number of times. After that they begin to break down, and the larger body parts and organs that your cells make up begin to break down, too: your joints wear away, your skin loses elastic... |
Why Are The Winners of Running Competitions Like Marathons Almost Always From Africa? | The "Kenyans" train very hard. They also train at a very high altitude. When they come down to sea level and run with us puny Americans they have an easier time because of how much oxygen they need to accomplish the same thing. Kind of like how sherpas can jog all over Mt Everest. |
what is the difference between fire and flame? | Fire is generally the state of being, or is the name giving to the entity at large. The tree is on fire. That fire is huge. Flame refers to the actual "tendrils" that combine to create what we see as the fire. Those flames are licking the bottom of the pot. |
why are latitude lines parallel, but longitudinal lines converge at the polls? | Because it makes the most sense. If you walk east/west, you're only changing longitude, if you walk north/south, you're only changing latitude. If longitude were defined like latitude, only orthogonal, then you'd get really weird results that would be confusing. For example, there'd be some arbitrary line where things ... |
Why do men have an Adam's apple but women don't? | Women do in fact have them, it's just that they become much more pronounced in men after puberty. |
What is the explanation behind the phrase 'peace is not profitable'? | Countries participating in a war have to free up a tremendous amount of capital to fund the war effort. They divert savings or borrow to build factories, create stockpiles of food and armament for soldiers, mass-produce vehicles, and so on. And funding a war takes a LOT of money, with all of it actually being spent and... |
Why are some people "mouth breathers" and other people "nose breathers"? | It's more natural for people to breathe through their noses when they are at rest. In about 85% of cases, mouth breathing is caused by blockage in the nasal cavities that prevents people from getting enough air through their noses. |
How is betting allowed on WrestleMania, when the outcome is predetermined? | The outcome might be predetermined but it is not publicly announced before it happens. The people that are betting for and against a certain wrestler are not people that know what the outcome will be, only a few people will actually know what the outcome will be, and they are most likely not allowed to bet on the outco... |
What is a TV show's rating an how accurate is it?? ELI5 please | It's an estimate of how many people watched it. In the US they're done by a company called Nielsen which either gets people to keep diaries of what they watched or installs a device that connects to your TV and automatically reports back. It's about as accurate as you expect considering they survey 0.02% of families an... |
Those "fundraisers" that have grade school kids running around selling a company's products door to door. Are they technically legal? If so, why? | Of course they're legal, though I believe your parents had to sign a consent form; I might be wrong. These fundraisers are often part of a sale of things like Girl Scout cookies, magazines, candy bars and other little stuff. The products are over priced intentionally because the customer knows a portion of the sale is ... |
What 'tracking' does on a VCR? | Such a retro question! VCRs use reel to reel technology. So tape goes from one wheel, through a reader head, and into another wheel. That reader head has to very carefully line up with the VCR tape in a particular way. In a VCR, the head actually reads diagonally. This diagonal innovation is what got VCR to exist. Othe... |
How did the whole microchip credit card thing start? | For under $100, you can buy a device that will write a credit card number to the magstrip on a card. There is virtually *zero* security involved there. It was also becoming increasingly common for criminals to place "skimmers" - devices that would capture the number of cards run through it - on ATMs & gas pumps. Those ... |
Why does air cool when it's pressure decreases? (Conversely, why does air heat up when it's pressure increases?) | Temperature is caused by atoms and molecules whizzing around and hitting off each other. The more collisions, the higher the temperature. If you hold a finite volume of air in a container and change the size of the container, that effects whether the molecules bounce off each other and the sides of the container more o... |
Why do we all perceive time going in the same direction? | There is a concept in physics called the [Arrow of Time]. This is basically the fact that time seems to only flow in one direction, despite the fact that on the smallest scales physics should be independent of the direction in which time flows. However, the reason why this is the case is an outstanding unsolved problem... |
What do people mean when they say a singular sperm contains 35MB of data and how did somebody figure this out? | Because a sperm cell contains data in the form of DNA. All cells contain DNA. DNA is a code of four base units in groups of 3 in various combinations. A section of a string of DNA might say GGGAAACCC which is GGG, AAA, and CCC, which would correspond to three different amino acids. So, all cells with a nucleus contain ... |
What's the difference in meaning of the word "liberal" as in 1) Liberal Democracy and 2) Liberal political candidate? | \'Liberalism\' is basically broken down into two broad schools of thought. "Social liberalism" is basically what most people think of as "left-wing", whereas "classical liberalism" is something closer to libertarianism. This explains the difference. Some conservatives embrace aspects of classical liberalism, free marke... |
Why is music emotionally moving? | Many things in life can make you feel strong emotions. Your brain has been meticulously forged by evolution to emote to different events in order to keep you alive. Also, you have been exposed to music throughout your life, and like a dog who learned to salivate when a bell is ringed before the serving of a delicious b... |
If USPS postman doesn't ask for my sign and drops off package, what's stopping someone from ordering expensive stuff from amazon and claiming it never arrived ? | The shipper decides if a signature is needed. I have delivered $5 items requiring a signature and also left $2000 items on a porch when the shipper did not require proof of delivery. Source: Ex FedEx driver', "Nothing. People have done this to amazon,specifically.they generally just budget for it as a price of doing bu... |
Why do muscle injuries hurt a little on the day of the injury, but are unbearable the next day? Isn't sleep supposed to heal? (Graph Provided for Visual Aid) | I will attempt to give a loose description of what, I think, is most likely the case. When your body experiences trauma, whether blunt, sharp, increased or strenuous exercise not previously conditioned into by the body or any form of inflammation, whether caused by a bacteria, virus, parasite or fungi, the body will go... |
How do planets 'float' in space? | They don't. There is no up or down in space, so if you put something there it will just stay there, it doesn't need to float. However anything with mass is pulling everything else with mass towards it. This is the force of gravity, which is why we are pulled towards the center of the Earth. And also the Earth is pulled... |
What would happen realistically if North Korea invaded South Korea? | they would lose, after completely destroying the country. The first wave of rocket fire would be devastating. It would last as long as it takes for NATO to get in positionRegarding the comment that their military "is not big enough" to do that: they do have a sizable military. It's smaller than South Korea's, and consi... |
[meta] Can we put a note about the trillion-dollar coin in the sidebar? | Not specifically the trillion dollar coin, but a common question section would be good. There also needs to be much, much more moderation. If someone asks a repeat question that has been asked this often or if someone asks a question that isn't coherent enough to answer it should be deleted. |
How and why did "I have to" come into existence in English as a substitute for "I need to?" | The earliest meaning of "to have" was "to grasp", way back, before English even existed. From there it took on many more functions. First, it started meaning "to own", which was not too far from it's original meaning. Then, it became an auxiliary verb: "I have seen him". This happened in Old English, during the Middle ... |
Would our perception of time change if we were many times larger (100x, 150x) than we are today? | Yes, probably. Larger animals in general perceive time more slowly, as it takes longer for any impulse to cross their larger nervous systems. That's why it's so hard to catch or swat flies; to them, you're moving in slow-motion. _URL_0_ |
Why does getting hit/shot/stabbed/any other type of injury, in the arm hurt less or seems to hurt less than anywhere else on the body? | TV is not reality. It hurts like a motherfucker.I am assuming this trope is used in movies because it allows the main character to get shot etc in a place where there isn't too much of a risk for damage but he/she can still look badass while not being worthless the entire movie. Unless your talking real life. In real l... |
Why do we (usually) sleep better in hotels or other people's beds? | This is probably anecdotal and it varies from person to person. Personally I sleep much worse in any other bed than my own. You might want to check if your mattress/bed is of poor quality and look into investing into quality ones, sleeping well is important. Also it might be psychological, maybe you have some issues at... |
Why is it that over time reposted images become smaller and blurrier? | Many websites don't initially display the full image, but a downscaled version of it that you need to view in full resolution by clicking it or opening it in a new window. They do this to reduce unnecessary traffic, for example when people look at it on mobile devices that wouldn't be able to display the full picture a... |
Why can't I do my taxes like I am a business? | The standard deduction, personal exemptions, and progressive tax brackets should accomplish the same goal, without the book keeping effort. That is, you don't pay federal income taxes until you are making above sustenance level of income, and taxes increase as you are more able to pay those taxes. |
If there are so much garbage orbiting the earth such that they collide with each other, how come view of sky is not changed since 20 years? | There are a huge amount of space junk orbiting the earth. According to ESA 2013 > 29,000 - for sizes larger than 10 cm > 670,000 - for sizes larger than 1 cm > More than 170 million - for sizes larger than 1 mm. But the volume they are in are enormous. If you look at a graph at _URL_1_ there are less then on per 1000 k... |
Why isn't beer sold in plastic bottles, like soda? | _URL_0_ Also, plenty of sporting events and concerts sell beer in plastic bottles so drunk people don't throw glass bottles at each other. |
Are the arguments for racial differences in intelligence, such as proposed by the 1994 book 'The Bell Curve', strong or weak? | Current theory is less about racial differences and more about socio-economic differences. Poorer groups with less focus on education tend to perform worse on IQ tests than wealthier groups with more focus on education . Of course, the current theory is largely biased away from connecting intelligence to race, as that ... |
How do planetary gears work? | [This is a good concise animation of the whole thing]. The orange on in the middle is the sun gear. the three greenish ones in the middle are the planet gears and the outer ring is the ring gear. The sun and ring gears are the inputs and outputs, it does not matter which one but only those two can be connected to anyth... |
Why do so many types of pills result in dry-mouth? | A lot of medications have anticholinergic effects, that is, they block the receptors for acetylcholine, the neurotransmitter that induces salivation. Anything that stimulates adrenalin receptors might cause the same effect tooIs this similar to the effects marijuana has with the common "dry mouth"? |
When can you carry something heavy why do you always only 'just make it'? | For the same reason you always have to pee more the closer you get to a bathroom when you really have to go. Your mind sets limits and your body reacts to those limits. |
Why are movies rated PG-13, but TV shows rated TV-14 in the US? Why do they increase the age by 1 for TV shows? | The film ratings system is administered by the Motion Picture Association of America, while television content ratings are governed by the Federal Communications Committee. Other than that there really isn't a reason. |
How does electricity get converted to movement in machines? | Magnets. If you coil wire around a piece of metal and apply electricity, you make an electromagnet. If you also have a regular magnet nearby, you can get them to pull together. If you also set this up in a cycle, you can keep applying electricity and pulling to the next magnet, and create a motor. |
How do musicians sample older songs? | There are many ways to do this, but procuring original individual tracks is not one of them. I'm not going to type a novel here, but EQ, filters, and other effects are commonly used. |
Why do companies price things at $4.99 instead of $5.00? | Psychologically 4 is less than 5. Since we read left to right, we see the 4 first and automatically associate it as being less than 5. |
How come Americans have large portion sizes and relatively cheap prices for their food? | When you go to a restaurant, you pay for the service first, then for the actual food. As a rule of thumb, the ingredients usually make up only 1/4 to 1/3 of the costs. Additionally, the work of preparing a dish twice as large usually isn't twice as much for the chef. So it comes down to the customer's expectations. Ame... |
Why would the Eurozone collapsing be a bad thing. Can't they all just go back to their own currencies? | Depends on your timeframe. If you are talking about the long term consequences, like hundreds of years, then yes, of course, the countries can go back to their old currencies and they will adjust to whatver pros and cons that arrangement has. However if you are talking about time scales important to people alive, remem... |
Rearranging formulas/equations while following BEDMAS | A common issue is when multiplying or dividing, people tend to forget to apply to *all* terms in the equation. An Algebra 1 example would be like this: > **3x + 5 = 24** You might think to do this: > x + 5 = 8 thinking that you "divided both sides by 3." But in that case, you forgot the 5. So you should have done this:... |
When repaving a road, why do they skip the overpass? | I don't think they can pave continuously because of the expansion joints.Its also has to do with weight. The amount of load the road is guaranteed at. Over time additional layers of repave would significantly reduce clearance heights both above and below the bridge.I don't know how much is true about has been said so f... |
What is Matroid Theory? | It is like matrix on steroids. Matrices are studied in linear algebra and they are easy because they have a well understood structure with straightforward consequences. Matrices are are hard because such said rules are still much more abstract that what you see in high school or basic calculus. Matroids are like matric... |
why can't blood from organ transplant patients be accepted for donation? | According to [this] you just have to wait a year to donate blood. I'm guessing it is because of anti-rejection medication. Also says no brain transplant stuff because of prions. |
Why is gold worth so much? | For most of history, gold was the densest substance known. So when it came to making money, gold was the natural choice. Anything you might try to adulterate a gold coin with would make it lighter, so you could instantly know it was a fake just by weighing it. Gold provided a degree of security that no other metal coul... |
Why do we lose balance when we're standing on something compared to just standing on the floor | Your balance can be affected by many senses. You do use your eyesight in part when trying to balance. Just seeing that you are on an object will have you subconsciously determine that you need to focus on balancing which can throw you off. |
I'm sufffering, first world drama style, from the common cold. Please ELI5 the epic battle between the virus and my immune system. | First, the virus enters the cells in your body. Then it uses all the machinery in the cell to make more viruses. Then it pops the cell to release all the new viruses. This is not healthy. ~~Rinse and~~ repeat. At some point your body realizes this is happening. Its usual response is to raise your temperature, giving yo... |
I have $20 to spend this month of food, can I get the proper nutrition? | This has been deleted because it is not asking for a concept to be explained. I'd recommend /r/frugal for this question, but r/answers or /r/askreddit may be able to help too. Thanks. |
Why does nearly everyone hate the sound of their own voice when they hear it? | Sorry mate but: _URL_0_ Don't want be a jerk but I kinda posted it earlier. And by the looks of it you reposted it. No offense though. |
How to ophthalmic emulsifiers work? | If you leave a bowl of water on your kitchen counter for a few days it will dry up . Similarly, your eyes will dry up faster if you only had water on them. To prevent that, your eyes has a thin layer of lipids that reduces water evaporation. Certain eyedrops have emulsifiers that helps stabilise the fatty layer to redu... |
Why does the U.S. support a dictatorial government in Yemen (a country under sharia law), denouncing the rebels, but has the exact opposite stance in Syria? | Because every geopolitical move America makes is based on either money, or power. Ideals dont even factor. If your totalitarian dictator supports American hegemony, he will get weapons and support, if your democratically elected secular government challenges us or sides with a rival, all of a sudden rebel separatist fo... |
Moore's Law - Does computing power really double every 18 months? Will this ever plateau out? | "Moore's Law" is actually just an observation of a historical trend - the *density of transistors* tends to grow exponentially, doubling every 18 months. This tends to translate to more transistors and, when coupled with improvements in clock speeds, lead to exponential increases in CPU power throughout the 80s, 90s & ... |
If a person was shrunk down to fit in the palm of one's hand, would their voice become high-pitched like in it does in movies? | I would imagine so. Itty bitty vocal folds and all that. To quote from [Wikipedia]: The perceived pitch of a person's voice is determined by a number of different factors, most importantly the fundamental frequency of the sound generated by the larynx. The fundamental frequency is influenced by the ***length, size, and... |
What's the difference between a battery pack in series and a battery pack in parallel?( Please forgive my stupidity) | A cell has 2 properties, voltage and current. Having multiple cells in series increases the voltage provided by the battery but doesn't effect the current. Having multiple cells in parallel increases the current provided by the battery but doesn't change the voltage. |
Why are personal aircraft so expensive? Is it parts/construction or is it because it's a luxury item? | A few reasons, the main one being FAA certification and relatively low volume. Similar to like how all cars must be crash tested on the road and how safety items on your car must have NHTSA certification all the expensive parts of an airplane who's failure could lead to a crash require FAA certification. This is one of... |
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