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The first SHA1 collision by Google | SHA1 is a hash algorithm. It takes some data, runs it through complicated math, and gets something like a fingerprint. You always get the same fingerprint for the same data, but you can't get the data from the fingerprint. SHA1 only produces a fingerprint of 160 bits . That's like 40 hexadecimal numbers long. There are... |
why do people kiss mouth to mouth to express their love to each other, and has this method always been the way (if we don't count sex)? | _URL_0_This video captures a lot of the reasons why we kiss, though kissing is hypothesized to be a learned behavior rather than an instinctual one. Mainly due to not all human tribes being documented as kissers, wherein it's thought that kissing may have originated from mothers kiss-feeding their babies. Another hypot... |
Why do we regrow flesh, but not bones | We do regrow bone. When a bone breaks, bone cells regrow to bridge the break and heal the bone. |
Why do most public toilet doors open inwards? | Bathrooms can be crowded. Don't want doors flying open and hitting people, or just being in the way in general. |
Why do robotic arms for amputees move so slowly? How can we make them faster/more responsive? | We could, but the problem isn't the mechanical part, it's controlling the limb. There are a lot of different ways a prosthesis can interface with humans. Most of them are not accurate enough to allow faster/more responsive movements without destroying accuracy. Also, movements that require proprioception/some sort of f... |
How does facial recognition work? | Forget faces for a second and think about bar codes. A bar code scanner can scan along a line and identify when and where the pattern goes from black to white and vice versa, and derive information from the bars. Take this and expand it to a facial scanner. A facial scanner will scan a face looking for similar inflecti... |
Why do we hear/learn so much about The Holocaust, but so little about other large genocides (Armenian, Cambodian, etc)? | Mostly eurocentrism in history classes . The Khmer Rouge and the Armenian genocide are less important to Europe's history and that happens to be where history classes tend to focus. |
Why can't we have better umbrellas? | What kind of crap umbrellas have you been using?Rain can come from varying degrees, depending on wind, making a complete water-shield difficult to make. The properties that allow an umbrella to repel water, such as making it out of hydrophic materials, may not be ideal for creating an umbrella that also repels ultravio... |
Why don't video games load when minimized? | This has to do with how memory is allocated right? Imagine this, you only have two hands . If one hand is holding a banana and another hand is holding a stuffed animal, the painting behind you won't paint itself. |
Why do Racecars have a sequential gearbox and street cars don't? What's the difference? | _URL_0_ Sequential gearboxes are very difficult to use on the street because they don't have synchromesh, or synchros. When a transmission shifts, all the gears are spinning at different speeds relative to one another. Synchros help this along, so you don't have to be a professional driver to drive a manual. On race ca... |
Why do only some plants make tea? | If you want to be proper about it, you can only make "tea" from [Camellia sinensis]. All your other \'herbal teas\' are called "tisanes". You can take pretty much any plant, dry it & cut it up & then soak it in hot/boiling water. If you want, you could try drinking it. The problem is that not all of them are going to t... |
When an ant bites me, is it because it's constantly biting every surface it walks on, or does it know that it's on a living thing? | Ants bite because they feel intimidated or that the nest is in danger, even if it's not in danger in YOUR mind, the ant doesn't know that you're not a threat, and will bite and sting in defense. The ant does know that you're a living thing, but it doesn't know that you're not a threat.Ants bite anything either edible o... |
How does the mothers stomach "deflate" back to normal after giving birth? | Simple answer over a number of weeks it will start to recede, but there is the risk of stretch-marks on the stomach where the skin has stretched to accommodate the baby and then is no longer as taut as it once was when it recedes back. Suffice to say that during labour the biggest thing stretching her 'stomach' comes o... |
If someone touched our internal organs, would we be able to feel it like we do our skin? | Not really. They tend to lack the nerves that we use on our skin to feel. For example, brain surgery can be performed on a conscious patient with little anesthesia because the brain doesn't register sensation on itself, if that makes sense. That being said I believe some of our internal organs do register pain, so it w... |
The A not B Error | Not entirely sure what you're asking the error _actually_ is the child picking the wrong box - namely the one it had learned before - instead of the one it saw the toy disappear under. It means that it doesn't understand that the object is hidden by the box; it works only from the previous experience "picking box A pro... |
What do pharmacists actually do besides moving pills from one bottle to another bottle? | I have a pharmacist friend and I wanted to know this once, too. Their role is not of any particular service directly to you. Yes, they can give advice, and yes, they're educated in medicine interactions, but that's almost entirely not important. Most of the technical work is done by computers. There are too many meds a... |
Can needles and vials that have been discarded after medicinal uses (for example, immunizations) be recycled, and if not, why not, and what happens to them? | You wouldn't want to directly reuse them because when you stick them into someone you might contaminate them with whatever diseases or infections the patient has. You might be able to reuse them if you sterilized them first but this usually isn't practical. The cost of a hypodermic needle simply isn't high enough that ... |
What is the difference between real time notifications and push notifications? | with real time notifications, the device constantly checks the server to see if there is something new. With push notifications, the server sends a notification to the device that there is something new, prompting it to download it. push notifications are usually preferred, as it doesn't constantly check the server it ... |
The difference in scale between the first flight and the moon landing compared to the difference between the moon landing and a manned mission to Alpha Centauri? | The moon is about 238,900 miles away. If you were to drive there , at, we'll say around highway speeds, 70mph, it'd take you about 142 days to get there, or almost 40% of one year. To get there today, you'd have had to have left around November 29th of last year. If you were to drive the same speed to alpha centauri, i... |
How animals can evolve to copy colors around them into their own bodies? | Say you have a species of some kind of wild predator. Let's say they're wolflike animals that live in a savannah like grassland. These wolves come mostly in dark browns and black. The dark brown ones are most likely to be able to feed themselves because they blend in to the tan grasses just a little bit better. Their p... |
Can URL's be written in other alphabets? | Yes, it is possible. You can make a URL in the persian alphabet if you want. All UTF-8 Characters are supported. If you don't have a persian keyboard you need a virtual keyboard to access it. However, you have to be clear about the definition of URL. The following line is a perfectly 'valid' URL. file://users/me/chines... |
Aren't there any noise-cancelling headphones or earpieces Brian Johnson could wear and still perform? | Not at our current technology levels. Noise-cancelling headphones work by analyzing the noise around you and then emitting the same noise but out of phase in order to cancel out the sound waves. This works when the noise is a constant, predictable pattern as the analyze-and-emit part of the headphones needs a few secon... |
Why do we capitalize the beginning of sentences? | **TL;DR: It adds a lot of visibility to the hard-to-see period and double-space for sentences that are starting in the middle of a big paragraph.** In most fiction, standard English novels are divided into chapters/sections, and those into paragraphs, and those into sentences. All of these transitions benefit and make ... |
Do Canadians have the same rights and freedoms as Americans? | The US and Canada have different legal systems. While many rights and freedoms overlap between both countries you should never apply any legal advice regarding the US into the Canadian system.In general, your rights when dealing with the police here are similar to what exists in the US. There are significant difference... |
What is a scientific explanation for "The Hum" phenomena that the low-frequency, unexplainable noise that is heard throughout the world? | > What is a scientific **explanation** for "The Hum" phenomena that the low-frequency, **unexplainable** noise that is heard throughout the world? You just answered your own question. There is currently no explanation. |
How does Estonia have relatively low income inequality despite having a flat tax? | Estonia, and a lot of former Soviet countries have a lot of foreign direct investment, so the insanely rich people benefitting from their economy are in Germany and Sweden. Also as part of the conversion from Communism, many employees of those countries received shares or other forms of equity or profit sharing in the ... |
why do cheap restaurants often only have canned soda for sale instead of fountain soda, when the fountain soda has a much higher rate of return? | There is only a higher rate of return if you have a lot of customers purchasing it. There is a lot of overhead cost that goes into fountains that isn't there with cans. I'm going to pull some numbers out of the air just for example purposes.Say it costs $1000 for that machine, $25 for the syrup and, I don't know, $5 fo... |
When taking a bath, why doesn't the water feel as hot to my hands than it does to my legs/body? | The palms of the hands have thicker skin than the rest of the body. Also the hands are always exposed to the elements and so desesitized to temperature. It probably also has to do with hot/cold receptors in the skin as wellIf you wore gloves all the time this would not be the case. Your hands stay exposed more than alm... |
- Why does stepping on Lego hurt so bad? | It's smaller, so the pressure doesn't get distributed across your skin. Smaller, sharper objects tend to hurt more. It doesn't help that LEGOs are almost completely edges. |
Since there are foods proven to prevent cancer, why aren't they prescribed as part of the diet for cancer patients? | Firstly, there are no foods that have been proven to prevent cancer. There are foods that have been associated with a lower risk of cancer. Secondly, there's no point in preventing something that's already happened. Something that reduces the risk of something isn't the same thing as a cure once you have it, in much th... |
Why only some people get spontaneous nose bleeds? | Humidity can affect the capillaries in your nose and if the air around you is too dry the mucus surrounding your capillaries can dry up exposing your capillaries more', "The nose contains many very very small blood vessels called capillaries. There are many of these all over your body, but the nose is a very sensitive ... |
Why does steel wool burn so quickly and easily? | Steel wool burns *relatively* easily for steel because it has a lot of surface area so it heats easily and most importantly can be exposed to lots of oxygen. If you came here from the gif though it's a bit misleading. Either through editing or luck, that wool was a lot cleaner than most. This is a more typical attempt.... |
is the world really having more instances of violence and terrorism or is the media just creating that illusion? | More instances on what sort of timeline? The world is probably the least violent it has been since the beginning of written history. However, over the last year or so there has been a slight uptick in violent behavior. We're still nowhere near the levels we were at 100 years ago. With regard to ww3. Personally I think ... |
How are big items loaded in to a submarine. | The normal accesses to the boat are removable, making a much larger hole for loading items in or out. Anything larger than those openings require cutting and welding the hull.This is my favorite question I've seen all day Reddit's curiosity never ceases to amaze me. They plan those things before they finish the sub. Th... |
What is so special about mitochondria that allows respiration to be so efficient compared to the efficiency we can achieve when burning fossil fuels? | Less energy is lost as heat because the process traps energy in chemicals, which are then used to energize processes on a molecular level, rather than using the heat as the energy of the system to move mechanical components. Most real-world engines lose energy due to friction and heat loss to the environment. Respirati... |
. What happens when rubbing alcohol expires? | The alcohol itself will tend to evaporate past the cap, lowering the percentage of alcohol to water. Also, it can start to leach the plastic from the walls of the bottle.Things have expiration dates because **everything in that category** has an expiration date. Rubbing alcohol is considered a drug/medical supply and, ... |
Why do old movies often have a single hair in the frame? | This is likely a fault that is introduced either during the copying of a film, or during the telecine that converts a film onto tape or a digital format for television. Some of these telecines are done very cheaply, allowing faults like that to remain. |
Why do Walgreens and CVS, two nearly identical pharmacies, so often set up shop across the street from one another? | It's often that those locations are areas that are convenient for shoppers to access, and thus the benefit they get from being near major roads or a commercial area outweighs being right next to their competition.How many times have you seen a major intersection with gas stations on all 4 corners? The answer is there i... |
How does YouTube determine when to play ads? | They haunt the people without Adblock with ads until they decide to download it. It's all a big ploy |
How does an emulator work? | The trick here is that you have to emulate the original hardware, and that's why you usually need high specs in the computer were you're running the emulator. You need to run the Switch OS on an enviroment that the Switch OS believes is the actual hardware, chip, memory, input/output devices. You don't need to make an ... |
Does the use of numbers and special characters in passwords actually make them more effective than longer, simpler passwords? | Cracking passwords is hard, theoretically it can take millions of years. So, if you want to guess a password, you 'd start with e.g. english words, or already known passwords , just because that is what most people are using. If you have more time , you 'd probably try letters and numbers, because humans tend to use th... |
Karnaugh Maps. I don't get them. | Well, it sounds like you understand how to construct one, and maybe even how to use it, but don't understand why it works? To put it simply, when you draw circles around areas on the map that are the same, you are graphically doing algebraic simplification. For example, imagine a truth table where one column is all 1's... |
Why does the iPhone 7+ have 2 front cameras? | It doesn't, it has 2 rear-facing cameras. One is the normal 28mm focal length and the other is 2x at 56mm . This simply means you have a lens that is more "zoomed" in without losing quality. [This should help]. So, you can see 2x as far without cropping. They aren't the first, I forget the phones, but one has a normal ... |
Why is Reddit composed mostly of male, middle class liberals? | Reasonable conjecture: Because young teenagers tend to be more liberal. Also, reddit draws a lot of focus towards technology related issues, which men are on average more interested in. Finally, middle class americans have more free time to blow on reddit then lower class americans. Also, upper class americans are less... |
Why isn't cold water cooling a "thing" for houses? | One major problem is condensation on the radiators. You would need a drain pan beneath each one and drain tubes running to the outside or house sewer pipes. Central AC has a single drain. Window units drain the water outside. Plus you would need fans on the radiators to get effficient coolingYou can in fact buy this. I... |
Why is it that Bolivia is almost always a N/A country in data maps. | i have some theories1. like you said they are no interested in participating in SOME stadistics 2. the company is not interested in studying bolivia 3. the reseachers cancelled / could not finish the research |
Why are vehicles capable of going faster than the fastest speed limits if they're not intended for racing? | It has to do with engine's optimal running temperature. If an engine's top speed is limited to 55 miles per hour, that means it's usually running at 100% capacity just to meet the maximum highway speed limit. Over a long time, running at 100% capacity will result in a lot of wear-and-tear, overheating, and possibly mel... |
How does counting work in base systems higher than base 10? Or is base 10 the highest number system we have? | We use base 16 when programming computers. In order for that to work, we need 16 different "digits" - so when we run out after 9 we use letters of the alphabet. So if you're counting in base 16, it goes 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, a, b, c, d, e, f, 10. "10" in base 16 really means the number 16, the same way "10" in ... |
Why is it that people from different countries can play on the US national team? | Dual citizenship individuals can play for either countrys national team. Sometimes players from countries with strong leagues chooses to play for a slightly weaker national team because, hey, at least they get to play in the championships. For example, there's usually a bunch of Canadian-Italians in the Italian nationa... |
How do Geologists determine where a dig site should be? | I'm a civil engineer, but I work with soil stratigraphy so I can answer this. The history is important to determining what is in the ground, so yes, you are correct. Geologists also look at air photos to see if anything catches their eye. A lot of unique geographic features also mean there is a chance of something cool... |
In Space, how can we measure how fast spacecraft is flying? | Don't quote mee but if you are in a ship from earth you would send a signal towards earth and if you already know how fast that signal is, you can calculate how much time for the signal would hit a receiver on earth and get back to you. For example you could send 2 signals to earth one minute between each other, the fi... |
How much info can a website glean from websites open in other browser tabs? | Websites can't see what you're doing in other tabs, as that would be a major browser security issue. However, many websites contain Facebook "Like" buttons, or Facebook comments sections. If you're logged in to Facebook , the Facebook elements on those pages can see that you're logged in, and Facebook can keep track of... |
Why is Wikipedia considered an "unreliable" source? | Wikipedia is not a source. A source is where something is created. Wikipedia just collects information and presents in an easily usable format. None of the Wikipedia contributors create information just for Wikipedia. In fact, it's against the rules of Wikipedia to create information for the site. If you're asked for t... |
What would happen if mosquitoes went extinct? | [Nature: \'Ecology: A world without mosquitos\ "Yet in many cases, scientists acknowledge that the ecological scar left by a missing mosquito would heal quickly as the niche was filled by other organisms. Life would continue as before — or even better."', "Overpopulation probably but not much else. They're useless.As h... |
what are the little stars that appear on our vision sometimes? | The retina lines the inside of your eye and is responsible for sensing light. The light sensing part are the photoreceptor cells that send signals through your optic nerve to your brain so you perceive that light. However, these photoreceptor cells can also fire from physical stimulus. The transparent gel-like fluid in... |
- why do the bubble in Guinness look like they’re going down? | Actually they do go down. The bubbles in the center of the glass move up, creating a flow of the beer sort of like a hurricane. It’s shaped like a donut and the bubbles on the outside are pulled down and then into the center where they rise and form that awesome creamy beer headTo expand on other answers: 75% nitrogen,... |
why aren't films released at the same time worldwide? | Part of it might be promotional - they want the actors at press events and on talk shows the week leading up to the release, and they can't be in two countries at once. Also, the films being released any given weekend probably differ in importance from country to country, and film studios take competition into account ... |
What is fire and what gives it color? | Fire is what we call the effect we see upon combustion. Combustion is the release of energy from a substance as heat. This is only one form of energy, and that's why it's possible to have varying intensity of temperature and brilliance, and reactions that give off energy more in, say, the IR spectrum . The color has to... |
How did countries determine what voltage to use in their electricity systems? | NA was the first to set up power grids large scale. Europe and everywhere else started later, starting later allowed them to have access to more efficient equipment so 220V was the standard. It's to expensive and a hassle to switch from 120V to 220V so thats what your household is stuck with. |
- How pliable are our genes to simple short term activities? | The short answer is some of them are very pliable but that the total number of such genes is still unknown. This works because genes have a whole suite of elements which form part of the gene but are not **directly** related to coding for the protein or enzyme that most people think is the usual product of the gene. Th... |
Why are so many people against the trans pacific partnership? | 1) Secrecy. Even though it's in its final draft. No one outside senate can see it. 2) 500 people in 28 workgroups drafted it. 85% of them are corporate executives and lobbyists. 3) It's reported to have a section that allow corporations to sue governments for damages and over turn regulations. 4) Past experience. These... |
What extremists are trying to prove backing their actions with religion? | They aren't backing their actions with religion, that is what the western media does. They clearly state the geopolitical reasons behind their actions However very few people in the west want to hear that sad reality and instead scream "muslim and jihad" over and over until they drown out any intelligent discussion. |
If Israeli citizens cannot enter Saudi Arabia, what happens if an Israeli Muslim wants to visit Mecca? | Jordan will issue temporary passports for Israeli Muslims going on the Hajj. I used to work with someone who did thatKnow a few Israelis that needed to go to Malaysia for business. They got special travel papers. $$$$$ > > > > religious persecutionWhen I went to Saudi Arabia I found out that if you have ever even been ... |
Christmas music really just seems to be the same 20 or so songs covered by 100s of artists. Why does no one ever release new Christmas songs? | Nostalgia is a big part. [Our buddies over at XKCD point out] that the big chunk of christmas pop songs came out right then the baby boomers were born, making these tunes part of their childhoodChristmas music occupies this weird space in the musical industry. It's all about the songs and the tradition. It all stems fr... |
How is it that creatures like octopuses don't ever sleep, when humans and other animals can't seem to function without it? | Octopuses do [sleep] and in fact enter into REM sleep just like mammals. Although scientists haven't identified all the reasons why animals **must** sleep, we are closer to answers. We know now that part of the reason we sleep is to [clear out waste products] in the brain. |
Why does white bread crisp quicker compared to brown bread when toasted? | It's made mostly from white bleached flour and is generally lighter in both appearance and density than most brown breads. The latter are generally coarser and heavier, and have more of the doesn't-burn-so-easily parts of the wheat grain in them like the grain's skin, particularly "whole grain" types of bread or most a... |
Why do Americans refer to the Republican Party as the Grand Old Party, when the Democratic Party is 16 years older? | According to Wikipedia: > The term "Grand Old Party" is a traditional nickname for the Republican Party, and the abbreviation "GOP" is a commonly used designation. The term originated in 1875 in the *Congressional Record*, referring to the party associated with the successful military defense of the Union as "this gall... |
Why did cell phones used to have external antennas? Why are they no longer needed? | It has a lot to do with the carrier frequency between the towers and your phone. The antenna size is pretty much related to the frequency of the carrier wave that transmits the information. Old phones used stuff close to 900 mhz, systems now a'days use frequencies closer to 1900 mhz which allows for smaller antenna to ... |
The psychology of fake martial arts | It's essentially the same psychology behind a faith healer or any kind of communal magic. It's a low level mass hypnosis. They believe in his ability and thus when he strikes, they "feel" it. There will be different levels of belief, but as they see others take the magic punches, whatever belief they already had get's ... |
Why are we getting less rain as the oceans become hotter and not more? | Who is "we?" Some places are getting less rain and some are getting more. Weather isn't one thing.Come and spend a week in the UK. If we get anymore rain they'll need to change its name to the Underwater Kingdom. It rains here waaay more than it used to. A month's worth in a day type of thing. I live in Glasgow and the... |
do animals of the same species use different methods for bringing up their offsprings, just like humans do? | Nearly every animal that raises its young will have its own take on the matter, even if the changes might be relatively small sometimes. Take cats, for example: One cat may decide the best hiding place to give birth is under the stairs, while another hides under the guest-room bed. One will let them fight it out, while... |
why do so many people dislike rain? | I actually agree with you, OP. I live in NYC, and I really like the way the city looks in the rain. It might have something to do with my name being Storm lol |
Why is it painful to move your leg after it goes numb? | I assume you're referring to the pins and needles feeling? Your foot "falling asleep" results in pressure being put on different nerves or blood vessels so electrical impulses/nutrients and oxygen can't be sent to the limb. So when you adjust your position and relieve that pressure, the nerves start to function again. ... |
why does McDonalds coke taste different than all other Coke? | McDonalds dispensed coke is made from a syrup that mixes with carbonated liquid when you activate the dispenser. Sometimes it tastes really off because they're getting to the end of the container of syrup and it's getting weak.Two things: 1) Each place sets their own CO2 to syrup ratio, so all places are a little diffe... |
Why do boxers get injured more often than Muay Thai/Kickboxers who fought more often? | Boxing has a smaller target zone, so more hits to the same area. Especially the head. Boxing uses big fat gloves to protect your hands so you can hit full force, even when punching the head which would ordinarily break your hand. Without those gloves, they have to hit lighter. They can also hit other areas like legs to... |
why can't you drink an object floating in a glass of liquid? | The object is floating in the water. As you tilt the glass to drink, the object continues to float in the liquid , which means the object will go up as you tilt your glass. This is why it's hard to swallow an ice cube, unless you take large gulps. |
I can't really feel the difference between -20F and 32F as much as I can feel the difference between 70F and 80F. Why? | How cold it feels has less to do with the absolute temperature of the air around you and more to do with *how fast* heat moves out of your body into that air. See, your sense of temperature is all about something called *thermoregulation.* For reasons of chemistry, your body works best when it's within a fairly narrow ... |
Why do some animals/humans stand still when something dangerous is approaching them? | A lot of animals have pretty bad eyesight compared to humans. This means by standing still you can be harder to see. Movement though is easy to see even with poorer eyesight. Cars haven't existed for long enough for there to be a greatly increased change in behaviour if it'd be selected for at all. They still have to n... |
Why does scratching an itch feel so good, but the same pressure/force on a non-itch site feel painful? | Scratching an itch makes it feel better because the scratches send more signals to the brain than the itch in that particular spot, and the feeling of the scratches distracts your brain from the itch. It doesn't hurt because you're focused on getting rid of the itch. Itching is essentially small amounts of pain signals... |
Why would Snapchat turn down $3 billion dollars in cash from Facebook? | Assuming it was purely a business decision: They're expecting their payout from holding onto it longer, either in direct profits or in a future offer, to be larger. |
What exactly is it that causes some women to die during child birth? | Sometimes she dies from an injury which induces labour. These tend to be things such as a car accident, a physical assault, etc. But in general the actual cause of death is that they bleed out. Either the child is a breach birth, or they already have internal bleeding, or they have a serious wound and combined with the... |
What is the sensation of spice? Sweet and sour are tastes, but what is spice? | Short answer : It's pain. Spice comes from capsaicin stimulating receptors on your tongue. Those receptors perceive it as an irritant, which over time is associated as the taste sensation of spice. People with an insensitivity to pain can't taste spice, and in the same way, people who can't tolerate spice simply feel a... |
Why are almost all songs played at major league baseball games played by an organ and why do they still do it? | Baseball stadiums were originally built before they had audio systems. So to have music that everyone could hear you needed a loud instrument, and that is what an organ was. Even when they added sound systems it was still higher quality and less expensive to use an organ. It has now been used for so long that it is a p... |
How are new elements discovered/created? | They take two smaller atoms and smash them together. If they can do it with just enough force and hit it in just the right way, then the two atoms will overcome the electromagnetic force, and the strong nuclear force will takeover, and bind all the protons and neutrons into a new nucleus. So if you take a titanium atom... |
Why is salt added to boiling vegetables? | I'm pretty sure salt is added to boiling vegetables just for flavour rather than for some reason like this. If you boil something it *is* going to lose flavour into the water so perhaps it's to improve the flavour a bit to counteract that. That's why I add salt to boiling things anyway. |
Why do some webites hide the price until you add it to the cart? | Manufacturers can enforce something called a "minimum advertised price" on their products through contracts with retailers. Basically, the retailers have to sign a contract that says they can't advertise the product below a certain price. Manufacturer's do this to ensure that their products sell at a certain price. It'... |
If an identical twin commits a murder, how does DNA evidence prove which of the twins it would be? | It doesn't. But they don't have identical fingerprints, which can sometimes be used to differentiate which twin was at the scene. And there's other kinds of evidence that can be used. For example, if I had a twin who committed a murder in Fort Worth at 3PM and our DNA is there, but I have multiple witnesses and securit... |
When I sleep in the sun, why is my vision blue when I wake up? | It's because you 've been looking at red -- or at least your eyes have -- while you 've been asleep. If you close your eyes on a sunny day, some sunlight is still getting through the lids, and it's tinted red because that's the color that makes it through. Because your eyes have been flooded with red light while you're... |
Why is there all this focus on advanced encryption/decryption technology but we still can't decypher some older things like the zodiac cypher? | It's possible that the zodiac cipher is some form of one-time pad cipher, which is mathematically unbreakable. It's a cipher that has its uses, but is usually less practical than modern asymmetrical key ciphers that are still insanely difficult to break but easier to properly implement. |
How do Fighter Jets, packed tightly in a hangar, move without damaging one another? | IIRC from when I was in the Navy, you need 5 people to move an aircraft. 1 to drive, 1 to walk at the nose, 1 at the tail, and 1 on each wing. Here’s a little video of moving an aircraft at night from the flight deck to the hanger deck of an aircraft carrier. _URL_0_', "They pull them with little tugs, and don't start ... |
When you have to pee, why does the sound of running water make you have to pee more? | Unscientific answer? Pavlov. You associate a stimulus with an action, so when you receive that stimulus, you act. Like you're 5 . Lets say you have a puppy. Every time you give the puppy a treat, you get a chair and pull it over to the cabinet so you can get the treats down from the shelf. When you give the puppy the t... |
what's happening to egg whites when they whip from running to fluffy? | Think of whipping up a sink of soapy water. The foam forms because of bubbles of air being trapped by the enhanced surface tension. Egg Whites are just like that but their surface tension is even higher allowing even smaller bubbles to be locked in. If you were to view the results under magnification you would see that... |
Why do we get nauseated when we see others hurl? | It's because humans originated as groups of individuals who often ate together. If someone vomited because of bad food, it was better in the long run for other people to vomit too, just in case they had eaten the same food. |
How is it that I've been writing for almost my entire life, yet my handwriting has barely improved since I was a child? | Because you haven't practiced improving it. You've just been doing it the same way. I know people who have played golf for 40 years, they still suck at it. Because they just play. You _could_ improve your penmanship, but your would have to practice enough so that your muscle memory would use your new improved technique... |
What is an OpenPGP Public Key? | Some forms of encryption, like PGP, use asymmetric keys. That is, for any person participating in messaging, there are two keys. You can use either to encrypt the message, and the recipient uses the other to decrypt it. The two keys are called public and private. The private key is secret; only you know it and you neve... |
When my character in a first-person video game falls from a large height, I get the sensation of falling in real life. | You rely significantly on vision to inform your brain about where you are, and your relationship to your environment . This is why you may feel the sensation of moving backwards if you're parked next to a large vehicle and it begins to pull away. If it fills your field of view, your brain interprets this as you moving ... |
Why does salt cause corrosion on hard surfaces such as concrete? | Salt lowers the freezing point of water and will allow liquid brine to fill tiny cracks in the material. Then as it becomes diluted the freezing temperature rises and the water will freeze, forcing the cracks open. Over time this will break down the surface of the material. |
Living vicariously through someone else | I am assuming that you are asking about what the phrase means, rather than how to do it. Living vicariously through someone else means taking someone else's experiences as your own. An example of this is the situation where you wished you could travel to another country but can't. If your friend goes traveling and you ... |
Why does it seem Democrats support higher taxes, but Republicans support lower taxes? | That's a fundamental difference between fiscal left and right . Left = bigger government, more regulation, more services, more taxes required. Right = lower taxes, lower regulation, requiring smaller government and fewer services.There are two classes of thought behind this. * Raise taxes higher on the "rich" to pay fo... |
[Biology] What happens to our bodies when we "warm up" before working out? | Gets your heart pumping harder and dilates your blood vessels, which gives your muscles a fresh supply of oxygen. This increases their effectiveness, delays lactic acid buildup, makes your muscles more limber, and makes it less likely you will pass out. |
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