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What are the differences between strategy and tactics?
Tactics are low level small tasks, and strategy or higher level planning. So in war tactics would be how to maneuver your forces to take possession of a hill, where strategy would be that a specific hill is important to winning the battle/war.
if atoms don't actually ever touch one another - how can we feel things?
We never 'touch' anything because electrons in the outer shells of atoms repel each other at 10^-8 metres. What you feel when the surface of your finger touches another surface is a repulsion force between the electrons from the atoms that make up your skin and the electrons from the atoms that make up the surface you're 'touching'. Your perception of touch stems from your brain attributing a sensation to that repulsion force, whereby every time you feel that repulsion, a signal is sent to the brain which you perceive as a feeling/touch.
Why do humans, even from an extremely young age, have the predilection to dance?
Hearing music and rhythm moves about the fluid responsible for balance in our ear, and even thinking about a beat can induce the same feeling. We bob our heads and dance naturally because moving the head in the opposite direction of the disturbance to equalize our balance gives us a pleasurable feeling and a dopamine release.
How does rendering a video game at a resolution higher than what my monitor can show make things prettier?
Imagine that you're just drawing something black and white, like text. At low resolution a particular pixel at the edge of the letter is black. But at 4x that resolution, it's a 2x2 square, of which 3 pixels are black, and one is white. These pixels are then averaged to a dark gray, which is what's displayed at the lower res. The result is a softer, more natural edge Edit: corrected typo
what makes hybrid animals like the mule sterile, and is there anyway to make a hybrid animal that can reproduce?
Mule is not able to make sperms or eggs on its own, so it is sterile. This is because of difference in number of chromosomes in horse 32 and donkey 31, as they are not of same species. If you crossbreed within species, like in different type of dogs,they would be fertile. Because of the cross between horse and donkey, mule carries copy of chromosomes from horse and another copy from mule with different count .As a result it can not go through meosis, a cellular process that is required to form egg and sperm, hence making them sterile. As far as I know, there are currently no way we can make interspecies hybrid fertile. With advanvlcement in technology, it may not be that far though.
Why do some mobile apps require so many seemingly unnecessary or invasive special permissions?
they arent actually invasive, it is the basic requirements for the function of the app. if you have a small free game then it will often say 'there are no special requirements' but an app like tinder where you are connecting to facebook, using the wifi or data connection and also sending and recieving pictures and using the camera then the app needs to have permission for all those aspects in order to function. if you download a free game and it says it wants your location and camera then it might be a little iffy....but it simply means you can use the camera within the app and not that the app is going to be taking photos while you are sleeping
How does a towel get dirty if we're clean when dry ourselves with it.
Even though we have removed dirt from our bodies, bacteria can still reside on our skin, and when we wipe off the water we are also wiping off the existing bacteria onto the towel. There is also airborne bacteria that can get on the towel, and since the towel is wet and sometimes warm, it allows bacteria to grow much faster than usual, making a towel "dirty" after a few uses.
Why are the biggest burger chains promoting fish sandwiches right now?
During Lent the only meat Catholics will eat on Friday is fish. Thus up until Easter they will all promote fish.
How can Google offer such superior service with Google Fiber?
Actually Google is not dumping insane amount of money in the project. The cities selected for the fiber project provides Google subsidizes pricing on permits and somewhat pre-existing fiber capabilities. In Kansas City( the first city to get Fiber), an Internet-only package costs $70 a month. A TV and Internet package goes for $120 per month. Google also offers a free Internet package at "today's basic speeds" for customers willing to pay a one-time construction fee of $300. So Google is making money. Also, Google can gather more personalized information on preference of TV shows and internet searches that it could provide more targeted advertisement which is core of its business at the end of the day This article provides some info but I am not sure about the whole verizon fios stuff _URL_0_
Why do so many jokes involve 3? "3 Guys walk..." "3 Women died...." "3 guys find a lamp..."
I actually learned a bit about this. Comedy works on repetition. The two best # of times to repeat something is either 3 or 5. It has to do with audience anticipation. 3 drives the joke the home, and 5 passes through 'overplayed' and into the "It's funny again" category. Using 3 of something as the baseline of a joke, allows for this same thing. The first 2 are just the setup, but it's when you get to the 3rd that the joke gets innately funny. This actually works with quite a few things. I learned about it in a computer animation class. The teacher used the Pixar logo as an example. When the desk-lamp comes in from off screen and bounces on the the letter 'I' in Pixar, it does so 5 times, in order to create the same repetition effect.
How does a college foreign exchange student learn the material presented to them in whatever host country's language the classes are in, if they barely speak the language?
There are essentially three levels to understanding a language. -Reading/Writing -Listening -Speaking I can read and write Spanish fairly well. I know the grammar and a good chunk of vocabulary. It's simple enough to have a dictionary next to me in order to look up a work I don't know. If I am talking to a Spanish speaker, I can get the gist of what they say, but I will miss some notes. This is why it is important to have a professor that lectures with notes on the board as well. Also some people just learn better that way. I can speak a very broken Spanish. Not being native, I have to focus on translating what I am saying into Spanish, as well as the correct sentence structure. It will come out as poorly as your coworker. It would be difficult to do it at a college level, but not impossible. They would spend a lot more time studying the material.
In Games, why are the team colours facing off against each other usually red vs blue?
Because you need two bright, primary colours that can be easily distinguished both against each other and against the environment. In Video games you're unlikely to come across large sections of bright and flat red or bright/deep blues, whereas you will come across a lot of greens and yellows. Red and Blue are highly distinct from eachother, so they fit this niche nicely. That's my guess anyway.
Why are new technological leaps so expensive? For instance, it can't seriously cost so much more to produce DDR4 memory than it does to produce DDR3.
It's a couple reasons. One is research. New technology requires millions and sometimes billions of dollars of research and development. For the first years of a technology's release, its price is higher to repay these costs, as well as the costs of failed designs that came before it. Another is scale. It takes time to build factories and whatever else to make a new type of technology, sometimes the machine that makes it has to be created from scratch as well. It takes time for the businesses that make the technology to devote the money and resources to make it, especially if there isn't proof that it will be a very popular technology.
Why in Europe you can plug in PC (or any high tech appliance) either way?
Computers don't work with alternating current, they work with direct current. So the first thing that happens when power goes to a computer is it gets transformed into direct current (this is what the brick on the chargers for many smaller devices is for). As with the lamp, the AC-DC converter doesn't care about which side is hot and which is neutral.
What is pi and why does it work?
Pi is the ratio between the circumference of a circle and its diameter. It works because it's a geometric law - if you draw a circle, c/d = pi.
How do some digital clocks still know the time after being powered off.
It has a small battery inside of it that keeps the clock running. Your computer, phone, etc. maintain time when powered off in the same way.
How can people know millions of digits from Pi?
There are many methods of calculating pi, but I think the idea that made most sense to me is this: _URL_0_ If you draw a regular shape on the inside and on the outside of a circle, the outer one will be larger, and the inner on will be smaller than the circle. If you increase the number of corners in the shapes, the shapes will get closer and closer to the size of the circle, but never quite reach it. Pi can be found in that ever decreasing area between the shapes.
why do people call Buffalo Wild Wings "BW3" when there are only two W's in the name?
it used to be Buffalo Wild Wings and Weck. Roast Beef on Weck is another traditional Buffalo NY food. But the Weck didn't catch on outside of the Buffalo area, so they stopped serving it and took it out of the name. It is really good though, and if you are ever in Western NY state you should try it. I recommend Charlie the Butcher.
Why can't pilots see when a laser hits them?
Lasers spread out the farther they travel. That "tiny dot of light" isn't so tiny after it travels 1000 feet through the air. If it hits the plexiglas cockpit window, it diffuses out even more. The result looks [something like this](_URL_0_). You're right that it only flashes for a split second, but that's all it takes. When people say that it blinds pilots, it doesn't mean that the laser is burning out their retina and causing permanent blindness. They're talking about *flash blindness*, the temporary dazzling effect you get when a bright light flashes in your eye. Like when someone uses a camera flash in a dark room, and you have to blink away the aftereffect for a few seconds? Imagine trying to land a plane during that.
Why do fiscal years start in April (usually)? Why don't companies just pick Jan like the calendar year?
Depends on where you are. UK fiscal years are based on the old Julian calendar, where the new year started on what is now ~April 5th-6th. Changing it now would mean everyone would have to balance the books over Christmas, which I don't imagine would go over very well. Other countries like Germany and China do line up with the calendar year. There's a nice list here: _URL_0_
Why do people say taking antidepressants long term use is bad for you? They don’t repair the imbalance in your brain, so when you stop won’t you be just as depressed again?
This may not be the case for all antidepressants... Serotonin receptors get up regulated in your brain as a result of increased serotonin caused by certain antidepressents. This would mean that once your off these drugs baseline serotonin levels (which may be low to begin with) are restored and are less effective at binding to serotonin receptors. Source: Biomedical Science Grad
why do you go light headed and queasy when seeing a bad cut
This is caused by what is known as the vasovagal response. It's a reaction by the body to certain triggers that causes the heart rate and blood pressure to drop, which in result causes you to feel lightheaded and queasy because the brain doesn't get enough blood. One of the thoughts is that it is an evolutionary mechanism to prevent blood loss when the body is considered in danger, as a lower heart rate and blood pressure slows down blood loss. The strength and triggers of this reaction differs in different people, where for some people the mere sight of blood causes the reaction.
Why didn't America start off using the metric system?
It was actually introduced (by France) after the USA was founded. France introduced the whole system in 1799, America was founded in 1776. Parts of it have been around for much longer, but the system as whole was not introduced until after we were founded.
How would I find the most downvoted stuff on reddit?
A quick search turned up [this](_URL_2_) gem: Karmanaut removing Bad Luck Brian's AMA since it conflicted with the stated rules of the subreddit (as he interpreted them, or whatever; I'm trying to maintain journalistic neutrality here). There's also the classic [Geraffes are so dumb](_URL_0_), but that got an order of magnitude fewer downvotes. Karmanaut's post dethroned [Fucking faggot](_URL_1_) as the long standing champion of downvotiness. You might have some fun with /r/worstof. One thread I'm trying to find but can't with a quick Google is one where someone pointed out that the "z" key allows downvotes. *Every* comment was at several hundred downvotes. Not quite the vile post that you're probably looking for, but I found it amusing.
Why is it that my 12-year old dvd player can handle the newest (encrypted) DVD's without a hitch but my 2013 Macbook is unable to duplicate my purchased dvd for a digital backup?
Your 12 year old dvd "Player" ? Playing a DVD and ripping a DVD are two different things.
Why, when a person is sentenced to death does it take decades to follow through on the execution?
If you're an innocent person and you get put in jail, it sucks, but at least there's a way to fix our mistake, release you, and pay back some of the damages. It happens, and the state definitely doesn't pay *enough* for that kind of mistake, but at least it's something. If you're innocent and we execute you... that's it. We can't fix that if we find out later that you were innocent. And we've had plenty of cases of people who were exonerated after their executions. So as much as possible, we like to be *really sure* that you're guilty as charged before actually pulling the switch. What that means is many years of appeals - lawyers trying to find new evidence to exonerate the accused, or at least to reduce the charges or the sentence. Only once several appeals have failed do we actually set an execution date, so the idea is that we're trying as much as possible to give them a fair shot at proving their innocence, if they can.
How do "entrepreneurs" develop their potentially lucrative ideas without having them stolen by others at any point in the process?
Because an idea takes a lot of time and dedication to implement. If someone's stealing it, they're already late to the game and without the initial motivation (and probably understanding) that started the original idea. Also, it's very common for successful ideas to be laughed at in the beginning, instead of stolen, because we're terrible at predicting what's going to go big. A website to allow strangers to sleep at your place for a few bucks? Right, like that's ever going to work.
Why don't we get E. Coli from plants grown with fertilizer containing cow manure?
Because people usually wash process and wash the plants off, they don't eat plants covered in shit straight from the ground
In military strategy, why is securing the "high ground" vital to victory?
The high ground still gives you better vision of the surrounding area, allows you to hide troops beyond the crest of the hill, and moving up a hill is usually slow going, which means being exposed to enemy fire for a longer period of time.
How does Google & Youtube backup my files, videos, pictures and not deal with hard drives failing all the time?
Hard drives are always failing. The drives are in arrays, your data is stored across multiple drives instead of just on one drive. Parity is used to reconstruct data when a drive in an array dies. For an example of parity we can use addition. We know that 1+ 2 = 3. Let's say you erase one of the numbers so you have ? + 2 = 3. Even though we've erased one of the numbers we can calculate what the missing number is using our old friend Algebra.
Why the Nazi regime was so successful.
The simple reason was that there were a lot of economic problems in the developed world, and people were still living under the horrible spectre of WWI. Nobody in Britain or France wanted a war, and the USA not only wasn't anywhere close to being the global power it is today, but it was aggressively isolationist ("Let Europe solve its own problems"). Early on, Hitler was aggressive and reckless enough to bluff his way into concessions. Later on, he had built up the military might that it wasn't a bluff any more.
Why do hackers focus on government institutions and companies? If they're as anarchist as some claim why don't they do a (modern) project mayhem on financial institutions?
Financial institution have too much to lose to leave their systems insecure. Most 'hackers' are just script kiddies that break into soft targets.
Why are porn tv channels still around with free porn on the internet?
i think that people that are older and grew up without internet porn are just used to those channels and don't want to change to the new fancy free internet stuff
Why is k-12 a state issue when most citizens look to the federal government?
In the US if the Constitution does not specifically give the power over something to the Federal Government it belongs to the State. Education is not specifically given to the Federal Government so they are only allowed to put a few regulations on it. And what do you mean by "most citizens look to the federal government"? They look to it for what?
Why has the USA seen such a dramatic increase in prisoners while most other Western country have seen a decline?
US has jail time for a lot of crimes other Western countries just fine people for. Most of it is a result of the War on Drugs and three-strike laws.
if a lightyear is the distance light travels in one year, how do we know something is 1000 light years away? Would we not have to wait 1000 years before we know, or do we use something other than light to measure objects in space?
The top post covered parralax well , but it looks like there isn't a good explanation of red shifting. From an earlier post, you seem to understand the doppler effect and how it relates to velocity. From parralax, we know that further away galaxies are moving away from us faster. If we assume this holds, we can model the universe is expanding and the rate of that expansion is increasing. If we know that light from farther away galaxies take longer to get here, we know that farther away galaxies are older (than we see them now). Older parts of the universe are redshirting more than younger parts and we can confirm this with *standard candles. * A standard candles is a term for a super nova (or other physical event) that has a fixed luminosity due to the nature of the event. If it has a given apparent brightness, we can know how far away it is from another means.
the meaning of " ! " in mathematics?
It means factorial. Simply multiply the number by every smaller integer down to zero. for instance, 5!=5x4x3x2x1. 8!=8x7x6x5x4x3x2x1.
What happens to adrenaline once its in your system?
Adrenaline is released by the adrenal gland in your body. Almost everything is your body can use adrenaline (called adrenaline receptors). The effects you feel under stress are caused by the release of adrenaline, so once you feel it, your body's already used it. (Under normal conditions) Once your body decides there is no need to be stressed, adrenaline no longer gets released. I say "under normal conditions" because people who suffer from anxiety (panic attacks) have a release adrenaline, which then causes even more anxiety, releasing more adrenaline.
Are first world countries only wealthy because third world countries are poor?
I hope somebody can answer your question as it is a very good one. But it is very, very likely you are right, and that we only live comfortably because someone else works their ass off all for an unfair amount of hours and for a joke of a salary.
why is Volkswagens false emissions test hurting the company's reputation more than other more serious recalls that have killed people?
It is not that emissions are more important than a human life. It is the fact that in this case, it was a very purposeful lie. And it makes people wonder if they are lying about this, what other things might they be lying about that might directly affect their safety. To some degree, people accept that production errors can happen, but it is the way the company responds to them that makes the difference. If they cover it up, it'll have more of an effect on their reputation (again, because if they are lying about that, what else might they be lying about) than if they immediately set in order a recall once they have spotted there is a systematic failure.
What does North Korea's attack on South Korea mean for me?
What it means right now: North Korea and South Korea are having another dispute with North Korea puffing itself up like it usually does. What it could mean in the future: A war between both sides that could potentially ruin both Koreas, and possibly American intervention. If America does intervene in the possible war, it probably won't directly affect you, but would affect you the same way the war in Afghanistan does.
What "Real Hacking" Is
The term "hacker" has not really a clear definition people agree on. The disagreement is mostly about the idea of a hacker as a person which explores technology, vs. a person tries to get unauthorized access to a system. There was an attempt to call that second one "cracking", but I never really hear that term anymore. When someone says "dude, someone hacked my email account yesterday" the usually mean the second meaning vs. "that guy showed a really sick hack at the DEFCON conference" for the first meaning. When people complain, it's usually because a certain "hack" was not really new nor challenging. Firing up a program like metasploit and using it to run a number of attacks (other people wrote) on a system is an example of that type of "not really a hack". An example of a good hack would be something like *finding* a way to install custom software on a console, even the manufacturer tries to prevent that.
Has CERN found the Higgs particle or not? I know last year there were very strong indicators that they did and they would get back to all of us when they tested further. But I cant find anything but 8 month old speculative documents at this point.
The LHC shut down for upgrades in early 2013 and is due to restart soon, so there are likely to be more announcements once it's been running for a while and they've analysed the new data. The current position seems to be that they're confident they've found "*a* Higgs boson", but won't yet call it "*the* Higgs boson". In all the experiments so far it behaves as a Higgs boson is predicted to behave, but there are more predictions to test. They also haven't ruled out the possibility that this is one of several types of Higgs boson that exist.
In cases of mass shootings with one perpetrator, why do witnesses often report seeing multiple attackers?
Gunshots are very loud. That means that they echo in situations where other sounds wouldn't have audible echos. They hear shots from several directions, and tell that to the police, who decide to play it safe and act as though there are multiple attackers.
How are "knots" formed in trees?
Most often they are the point of an infection or infestation and the trees version of an immune system seals off that area from the rest of the tree to protect it.
When we drink the juice of a fruit, what are we drinking? What does the juice do for the plant?
Fruits are usually bait. The plant puts sugar and water in it to tempt some animal to come along and eat the fruit. In exchange for this food, the animal then distributes the seeds from that fruit elsewhere allowing the plant to spread.
Would using a local anesthetic like lidocaine help with the burning from hot peppers like habaneros?
Interesting idea. I'm not sure if it would or wouldn't help. I will note that milk doesn't (directly) counteract the pain or heat, at least that's not its primary function. The hot substance in peppers is an oil which doesn't mix (easily) with water. Milk contains fats that will mix with it and wash it away. Normal soap is also somewhat helpful, but milk is one of the only things you'd want to put in your *mouth* if the burning issue was caused by *eating* a hot pepper. Lidocaine might help on skin, but might not be safe to use in your mouth (read the instructions carefully before using any product like that).
Why do online newspaper use a paragraph for each sentence?
This is what they teach in journalism schools. A paragraph should only contain one idea as readers would get bored with a wall of ink.
Can someone explain how drug control rooms help drug addicts?
How do they help addicts? They provide a safe environment, usually with clean needles, in which to use. There's medical attention nearby in case of OD. Most importantly, it's an environment where users can be exposed to *help,* where they can ask for help, where they won't be arrested or judged.
How time signatures work and why 4/4 (whatever that is) seems to be frowned upon etc.
4/4 is the most common time signature... I've never heard about it being "frowned upon"
Is there any difference between eating 10 cookies today and eating 1 cookie every day for the next 10 days?
Yes. Eating a large number of cookies will add many calories into your diet. Your body will be busy processing those calories and using them for energy as they come from fast-energy sources like simple carbs. Other food you eat with fat and protein after eating 10 cookies will be set aside until the cookie carbs are burnt, and will lead to weight gain. Eating 1 cookie a day is probably not a huge enough influx of carbs or calories and will be fairly inconsequential and not promote weight gain nearly as much.
How come artificial sweetener can be used in diet soda to reduce caloric intake but cannot be used in chocolate?
You could use artificial sweetener to reduce the calories in chocolate but a large number of calories from chocolate comes from all the fat that's necessary to give it a proper texture. This is a problem you have with most solid foods - there's few things you can use to give them volume & body that can pass through your body without problems. Drinks are easy because they're pretty much just water + flavoring.
Why do MLB games start at random times like 7:05, 7:10, 7:40 etc., instead of just starting at 7,8,9,etc.?
Because of television broadcasts. It let's the station start their broadcast at a normal time, say 7, and have five or ten minutes to do an intro to the game before first pitch.
Airlines rules against using electronics before 10,000 feet and having your seatback in the upright position for takeoff and landing
1. Takeoffs and landings are the most potentially dangerous parts of the flight. Electronics reduce focus during safety briefings and awareness during the takeoff/landing. Reclined seatbacks and ajar tray tables reduce passenger mobility in the event of an emergency, when the ability to evacuate the plane are of utmost importance. 2. Flight attendants are so adamant about enforcing the rules (even to the point of moving you from a malfunctioning seat) because they can personally be held liable if a passenger does not follow these rules.
Why do Snowflakes have a 6-based symmetry, and why is each one unique?
Caltech has an excellent primer [here](_URL_0_) but basically, the molecular structure of water itself leads to the 6-fold symmetry, and the fact that no two are exactly a like is a result of tiny imperfections in the crystals as they grow, combined with the staggeringly [huge](_URL_1_) number or possible shapes.
When/How did peanut allergies become so prevalent?
Pediatricians in America advised against nuts since they represent a choking hazard. An indirect effect was that children's immune systems were not exposed to nuts during its development. Once developed, their immune systems reacted, violently (anaphylaxis) at times. The American Academy of Pediatrics just recently realized that in other countries, nut allergies are very low, so they reversed their position on nuts and recommended introducing nuts in an easily digestable form as early as 6 months.
How does prizes like "Win Pespi 4 LIFE!" work?
It all varies on the prize. Sometimes they give you a huge upfront amount that they call a lifetime supply, sometimes they dole it out every so often in instalments, sometimes they get you to ring up and ask for more when you run out. It's not going to be an unlimited supply though. It's rarely bad to win a life time supply of something, regardless of how they're getting it to you or how much a life time supply turns out to be.
Why does it hurt our eyes to look at something that is bright?
Human eyesight evolved in a specific environment to serve a specific purpose, so eyes are attuned to the needs of that environment. Eyesight is merely a light collection device, so any light spectrum greater than the normal range can damage these sensitive tissues. A pain reaction serves to avoid damage and is therefore a necessary biological function to protect eyesight. This is also why filters are needed to photograph bright light such as the sun. A normal camera lens functions within specific ranges attuned to human eyesight since being viewed by humans is the purpose of a camera.
Why did we come up with Magenta, Cyan and Yellow for printers instead of Red, Green and Blue?
It's the difference between additive coloring (RGB) and subtractive coloring (CMYK). The paper is white so by using Magenta, Cyan, or Yellow you are using the ink to "hide" portions of the white coloring (which contains every color) thus allowing the unhidden portions through. If you used all 3 the result would be black, but black ink is simply used for this instead. Using magenta and yellow for example obscures everything but the red light so the result appears red when you put Magenta+Yellow ink on a spot. In RBG coloring (electronics - tvs, monitors, etc.) there is no white paper so you are simply adding red, blue, and green together in mixtures to get any color you want. If you use them all you get white, if you use none you get black.
Why isn't mouthwash a good enough substitute for toothpaste?
Toothpaste is a mild abrasive.This means that it is better at scraping, specifically scraping plaque from the teeth. Mouthwash does not have this property, and may not remove all plaque and food scraps from the teeth.
Movie Volume - Action scenes VS dialogue
It's more of a side effect when converting from surround sound to stereo. Because surround has 7 speakers around you, each one requires less volume to make a large total sound. When you compress these 7 speakers into 2 for stereo, the action sequences that use all 7 speakers normally, get compressed into two speakers and are made very loud. While the dialogue scenes with only 2 speakers being used initially, are not compressed so they are at their initial volume which is very quiet compared to the action scenes.
Why do optometrists and opticians refuse to tell me my pupil distance?
If they give you the PD value, then you can go on-line and buy glasses for a tiny fraction of the price which they would like to sell them for. Without the PD value you may have the right prescription on the lens, but the lens will not be in their ideal position on your face which causes distortion. You might be able to get a close number by using a friend with steady hands and mm ruler. I saved about 90% on my second set of glasses by going on-line ($50 instead of $500).
Do firefighters use fresh water to extinguish the flames? If so, why not use salt water? Also, why is the pressure of the water from the fire hydrant so high? I would like to know it’s practical use and what causes it to be so high, like maybe PV=nRT?
Salt water is unavailable most places, unless it's created. Also, salt water is far more corrosive than fresh. PV=nRT is the ideal gas law, and doesn't apply to liquids. Pressure is high because they have fat pipes with high pressure water feeding the hydrants.
How can a video have more likes than views?
Videos are stuck at 301 because YouTube starts to change the way they count views and they check the video starting after 300, so videos will often get stuck at 301 because it's the first number after 300, then youtube had to process it on their end before they start to count those views
Why do schools still insist on standardized tests even though all the teachers and students find them to be dumb?
Pretty simple. Because they are easy to grade and organize students based on a score. There are much better ways to gauge learning, but they require a lot more time and effort than filling in bubbles and running them through a machine.
How does rolling something between your hands produce an almost perfect sphere?
Imagine starting with a cube-shaped chunk of play-doh and rolling it in your hands. The corners get smushed, because they stick out. There are still some edges that stick out though. If you roll carefully, you'll eventually smush down all the corners and edges without making new ones. A shape that doesn't have ANY corners or edges is a sphere!
How can people die from skin cancer? Why can't the cancerous part simply be cut away?
Cancer is cancer because it spreads. If its a benign tumor or you catch it early enough then you can easily cut away the affected area and everything is fine If the tumor metastasizes(spreads) then your melanoma(skin cancer) can go from tumors on your skin to tumors in your liver or kidneys or lymphnodes. These tumors will also grow and spread throughout your body. Now you've gone from cancer on your skin to cancer throughout your body which can't just easily be cut out, this is where Chemotherapy and full body radiation come in as they attempt to kill all the pesky cancers that have spawned around your body.
What is the reason for car alarms going off due to vibration?
10+ years selling/installing alarms here. It's not a vibration sensor, it's a "shock" sensor. 504D is a common part number. It alerts the owner to an impact. For instance, your ex taking a Louisville Slugger to both headlights, or a thief smashing a window. Things that wouldn't trigger the alarm if it just went off for an opened door/hood/trunk. It's also a deterrent, thieves know to tap a car and see if it chirps. No one wants to stand there while an alarm goes off. The fact that it goes off for a severe vibration (thunder, motorcycles, etc) is a side-effect of a poorly adjusted sensor. They do have a sensitivity dial, and most pro's set it at a point where you need a *real* impact to set it off. Out of the box, it's often way too sensitive.
fluoride ingestion vs fluoride topically on teeth
> Will fluoride ingested orally react with HCl in the stomach? No. Fluoride is F- (a negatively charged ion) and it will remain F- when it's in your stomach. It doesn't react with anything there, especially at the very very low concentrations you'd find it in water and other drinks. > Every time someone say fluoride is safe, I wonder how it travels in the body until it gets to teeth. Please eli5 :) It actually goes straight from your mouth (the water in your mouth) to your teeth. This is why Fluoride toothpaste and mouthwash work even though you don't swallow them. For the purposes of tooth health, there's no reason to swallow it. However, there's not really any risk to swallowing it as long as you don't swallow A LOT of Fluoride every day for a long time.
Why is Europe so much focussing on going as "green" as possible, even while the most polluting areas are Asia, South America and Africa?
Europe is setting an example which other nations can learn from. It would be hypocritical of Europe to denounce the waste and pollution in other areas of the world and make no effort to improve its own efficiency.
What would it look like if we could see radio waves?
Phones and wireless access points would all glow, and their light would stream through walls like light through a lampshade. Radio towers would do the same, like distant lighthouses through a fog. All phones would be the exact same color, but the wireless access points would all be slightly different shades of the same color. The radio towers would each have it's own color. Radio also bends around objects well, so corners would light up just a little bit, like the corners of a glass fish tank with a light inside.
How come I can drink milk just fine during the day, but if I do it at night I wake up with horrible stomach pains?
Maybe you're somewhat lactose intolerant. Since digestion slows down at night, it could be that your body doesn't produce enough lactase to digest the lactose sugar in milk. Perhaps your body has JUST enough lactase when your digestive system is most active during the day.
If user "data" is so valuable, how exactly do we define it's "ownership"?
He who creates it and defends it, owns it. Company data is created by the company, not by a user. data sets are created and collected by the company. Users don't create the dataset, they make the data by actions, but by agreement with the TOS, they hand over that data to the company.
Why do so many stores require a minimum amount of purchase for you to use your credit/debit card? (Usually a $10 minimum or so).
The fees to operate the machine can usually seem exorbitant. Especially in smaller towns, you'll see some credit card reader companies charge a base fee per swipe and then a percent of total cost. Basically, if you spend less than $5, some places could technically lose money when all costs are accounted for.
Does the human brain have a "refresh rate"?
We haven't seen any significant evidence thus far to conclude that it does. Part of the issue is the brain just isn't organized enough for any kind of cohesive, system-wide refresh rate. That said, individual nerves have a resting period in between signals in which they are unable to fire (or at least it's more difficult for them to fire), so there could be an argument for such a phenomena when looking at small nerve systems.
If the economy is getting better, why is it so difficult to get a job?
To my knowledge we only solved the unemployment issue by creating low paying jobs, like technical and blue collar. But we didn't help the middle class which is the heart and soul of a countries economy. [Edit] to add-on this was what the last administration did. We have yet to see how the new administration will and what to do.
How come Doctors don't get sick more often?
Doctor here. I don't touch my face, eyes or nose unless I have just washed my hands. I don't eat in public without washing my hands. When I get sick, I can usually trace it back to some kind of shared food, like appies at a meeting or restaurant, and then I blame someone else. Some time ago I took an outdoor course that involved building things outside. It was dirty work. The food (lunch and dinner) was provided. I had to walk about five minutes round trip to properly wash my hands, and I was pretty much the only one who did. Everyone got diarrhea. Wash your hands. Don't touch your face.
What is the difference between "feels like" temperature and actual temperature?
Not a professional but factor of humidity and windchill. The temperature may be 80 but if it's humid, it's going to feel much hotter. It's it's 30 degrees and there's a strong wind. It will feel colder.
The difference between global warming and climate change if there's one?
The terminology changed to be more broad. Global warming was what we figured out first, then someone went "oh wait, because the planet is getting *overall* hotter, that makes the weather do weird things. It's now rainier over here than usual, drier over there than usual... and a couple spots are even snowier than usual, even though overall it's too hot! We need to change the word."
How does a software company offering a "free student subscription" know you're a real student?
The answers here are correct, but I want to add: Autodesk doesn't actually care a whole lot whether you're a student or not. Autodesk makes all its money selling software to businesses. These businesses can get in serious trouble for violating the EULA of their software (such as using a student version for business purposes). It's also very hard to get away with; all software made in student software is flagged as such, so it'll quickly become apparent to those you do business with that you're effectively stealing. If you're not actually a student but just some random shmuck who wants to learn CAD, Autodesk is actually happy to help; if you manage to get a job with it, that will just encourage the employer to then buy the software that you're familiar with.
Why do we still use propeller planes in the Air Force?
Turboprop engines are far more fuel efficient than jet engines, and more reliable in unimproved areas with lots of dust, sand, grass, and rocks. So they are the engine of choice in applications where speed is not valued, but reliability and cost per mile is highly valued.
Why can't the UN intervine in whats happening between Palestine and Israel?
The UN doesn't have the kind of military force necessary to invade Israel - even if they managed to pass such a vote (exceedingly unlikely). Moreover, what would that accomplish? The Palestinians do not have a functional economy or government. They're almost entirely dependent on Israel for all of their infrastructure. I suspect Israel's desire to continue providing that support would be diminished by an invasion. You also have to consider the fact that what you're suggesting is that foreign powers expel the people living on those lands - who have been living on those lands for generations - in favor of what is essentially an invading force. It would be akin to the UN invading the U.S. to hand California over to Mexico.
Why is a broken leg a death sentence for a horse?
Horses must be able to have even pressure on all 4 legs. They have very poor circulation in their legs and need their feet to be on the ground to keep the blood flowing properly. When you have poor circulation or none at all, tissue starts to die off. This is why horses must be able to stand on all 4 legs. If they put more weight on another leg to compensate for a hurt leg that can cause laminitis which is extremely painful/deadly
If blueberries are blue and blackberrys are black, why are strawberries not called redberries
There are more berries (lingonberries, cranberries, etc.) that aren't named after colors than that are. So...maybe your question is "why did we give a couple of berries names that are as bland as their color?" Strawberries are frequently covered with straw during their overwinter process to keep them warm enough to not die, protected from the elements.
Why hackers can access database from big companies but can't access Google's search algorithm?
Are you so certain that people have not hacked or have access to these materials? I'm not so certain. Hackers don't announce their hacks 999/1000 times. They don't make it public. Why would they? That just means people will know they got hacked, fix the problem, and try to find the hacker. Or the hacker could just shut up and continue doing whatever they are doing.
Why does each piece of a broken mirror have its own reflection
When you break a mirror, you multiple smaller mirrors. Unless those mirrors are oriented in exactly the same way, the light will bounce off of them at a different angle and give you a different mirrored image. If they *are* oriented the the same way, they will still reflect the same angle back at you.
With today's modern audio technology, such as ISDN, why is the sound quality still so poor in phone conversations?
New phone tech has to be backwards compatible with old phone tech, which means the quality is on par with old phone tech.
why do people get so passionate about their sport's team when they are technically not affiliated with them?
from what I've seen, a lot of people think of their sports team as direct representation of the region they live in/are from, and are trained to see it that way since childhood (if their family are also big into the team). you see this a lot with teams based in smaller cities, like the Green Bay packers, because as a smaller community it really brings them together as a community and also kind of puts them in a national spotlight where they wouldn't be without the team. it's just like a pride thing I think, kind of like people who really identify with their country of origin.
Why can't we attach a 100X microscope to the eye piece of a 100X telescope and get a 10000X zoom?
It's really hard to answer this in an ELI5 manner, there's a lot of complex optical physics in play. What is important in optical systems, particularly when you are talking about 'zoom' is resolution. By resolution, I don't mean how many pixels are on your screen, or how many megapixels the camera has. It is, the smallest details which can be resolved. The classic example used to illustrate resolution is car headlights. When the car is moving towards you from a great distance, at what point do you stop seeing a single point of light, and start seeing two distinct points of light? Without getting into the complexities, the resolution of an optical system is determined based on the size of your objective. This is why telescopes used to look at deep space objects are so large. In your example, while you may very well be able to obtain 10000x zoom, you will have extremely poor resolution so will not actually be able to see anything at all.
Why do all the planets in our Solar System orbit the sun in a latitudinal path/on the same plane?
A nebula ie a cloud of gas starts to collapse. The conservation of angular momentum result in that is spins. If you have a spinning cloud with particles that travel in random direction they start to collide. A spinning direction will be dominant and a disc start to form Particles that have a another orbit then the disc will pass trough it and collide with it. so the only way to orbit and not collide is to be in the disc. Planets are formed in the disk so they will all be in the same plane.
Why can't a brute force attack break cryptography key?
They can, but "just brute force it" is a process that can theoretically take years to do. Even with very powerful computing clusters (like the fastest ones known in the world), symmetric encryption can easily be long enough that the average time to brute force it would be hundreds of years... *easily*. The "password" (the key) being brute forced is simply too long to do it fast enough to matter.
Why do I always have lint in my belly button and on my balls? And why is it always blue?
The winner of the Ig Nobel Prize in 2002 did a survey on Belly Button lint. _URL_0_ The results show why people get lint and how different body types, skin colors, and shirts change the lint! Also, I read somewhere that blue is a common color for lint because the dark threads in blue clothing overpowers lighter thread colors!
How did we program computers with a concept of time?
Computers have a [crystal oscillator](_URL_0_), an electronic component that resonates at a fixed rate. The same type of component is used in ordinary quartz clocks.
How do those bladeless fans work?
The pedestal of the fan contains a brushless electric motor that takes in air and feeds it into the circular tube. Air flows along the inside of the device until it reaches a slit inside the tube. This provides the basic airflow that creates the breeze you'd feel if you stood in front of the fan. Dyson claims that the Air Multiplier generates a breeze with 15 times more air than what the device actually takes in. There **are** blades in the fan -- you just can't see them. The pedestal hides the blades. A motor rotates nine asymmetrically aligned blades to pull air into the device. According to Dyson, these blades can pull in up to 5.28 gallons (about 20 liters) of air per second.
Why is it that my PC can run high-end games easily, but is unable to emulate Nintendo DS games smoothly?
Emulators are basically software that are pretending to be hardware. If the software is doing a bad job of pretending to be hardware, you can throw all the computing power you want at it and you're still going to see a bottleneck in performance within the emulator itself. Emulation software is SUPER complicated to write for anything newer than the SNES/Genesis generation. It also doesn't help that a lot of games rely on hardware-level tricks to pull off some of the things they do, and if those specific tricks aren't available in the emulator, the game might not run or otherwise have problems. tl:dr; emulation is hard.
Why does Saudi Arabia oppose Assad's regime in Syria?
Isn't this a shia vs sunni thing? Iran-Assad-Hizbullah are shia, KSA and the others are sunni.
Why does fusion release energy?
Ummm, the energy released during fission is not, like, stored inside the nucleus of the atom, but it's actually (some part of) the nuclear mass, which gets transformed into energy. This is called as "mass defect", and the same is the cause of release of energy during fusion .i. e. When two nuclei fuse under pressure some of the mass gets transformed into energy.
What will happen if cat will have sex with dog and get pregnant?
You obviously haven't seen the show catdog.. huh? Edit: spelling
Why did the automotive industry choose 12v systems over other voltages?
A very long time ago automotive electrical systems were in fact 6 Volts. Someone figured out that if the voltage was doubled the current would be halved and thus allowing smaller Gage wire to be used and a significant cost savings to be realized. Wait for it...it won't be too much longer and we will be seeing 24 Volt systems to become the next standard.
Why are a bunch of boards closed to the public like /r gaming?
Reddit fired Victoria, the wonderful lady who coordinated a lot of the celebrity AMAs in /r/iama. iama and a few other subs are going down because this actually really fucks the way they operate. The others are going down in a show of solidarity.