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Why are we taller than our ancestors? | Better nutrition is a good start. Compare the average height in South Korea with the average height in North Korea . And that's after just half a century of malnutrition. Not sure about the rest, but the importance if better nutrition cannot be overstated here. I can imagine there's been some evolutionary selection in ... |
How does flea medication for pets work? | Almost all modern flea meds are insect neurotoxins that effect receptors that mammals do not have. It depends on the treatment but imidacloprid , indoxacarb and Fipronil are dispersed over the body by natural skin oils and muscle movements. This can take 24-48 hours to happen completely. This is also why you should not... |
What gives the federal government the right to ban marijuana? And why can states violate that? [Serious] | The Commerce Clause of the Constitution gives Congress the authority to regulate items that have a high probability of being trafficked across state borders. States that have chosen to legalize marijuana are simply choosing not to enforce federal marijuana laws and have gotten rid of most of their own criminal & civil ... |
Why did Britain and France declared war on Germany over the invasion of Poland, but not the USSR? | Although the English and French were not on the best terms with the Soviet Union, the Soviets had not been acting aggressively for the last few years, unlike the Germans. Before the Polish invasion, the Germans broke the Treaty of Versailles, militarized the Rhineland, annexed Austria, invade the Sudetenland , and then... |
How hard is it for a horse to carry a human? And what would be the equivalent for a human? | From what I've found it looks like an average horse can easily carry about 240 pounds. It can carry up to around 360 pounds with some effort, and over that only with considerable strain. So a horse carrying an average-sized person would be within that easy weight. Another quick search shows that around the maximum reco... |
Google acquiring Motorola Mobility. | There may be real implications, but current consensus in the tech and business communities is that this is just another salvo in the ongoing patent "war" between the major tech giants. Companies like Google, Apple, Microsoft, Oracle, and a few others are snatching up patents left and right, and paying lots of money for... |
what is a kardashev civilization? | Kardashev created a loose scale to describe hypothetical civilizations based on how much energy they could harness, as energy harnessed roughly translates to work that can be achieved and people that can be supported. A Kardashev-1 civilization is capuring the full energy potential of their planet. A K2 civilization is... |
Why did the Roman Empire get divided? | The first split came in CE 285 when the emperor Diocletian decided that the Roman empire had become too large to be effectively ruled by one man. He split the empire into West and East, keeping the eastern part for himself because it was richer in goods and trade. In the western part he appointed Maximian, who was in t... |
How supplements are not drugs and drugs are not supplements | It entirely depends upon whether that particular substance has been put through the rigorous multi-year testing required by the US Food and Drug Administration to prove that said substance does actually help or cure the condition the company claims it does . That process is Hella fucking expensive, and if a company can... |
Why was the Irish potato famine such a big deal? Didn't they have other foods they could eat? | Ireland produced enough food during the famine, but it was seized by/owed to the English. The potato famine was less of a natural famine, and more of a genocide. Similar things happened to the Ukrainians at the hands of the Soviets during the HolodomorMost of Ireland was incredibly poor and engaged in subsistence farmi... |
If many states have no laws regarding age of tattoo with parental constant. How is it not considered child endangerment/neglect to allow your 6 year old to get a tattoo? | The same way it is not considered child endangerment/neglect to allow your 6 year old to see a rated R movie. Just because something has an age range does not make its particularly dangerous for people under that age |
How dry ice is made | Once you cool Carbon Dioxide, a gas at room temperature, enough, it becomes a liquid, and, after even more cooling, it becomes a solid, which is basically just dry ice. When the dry ice warms up enough, it returns to the natural gas state, but there's a certain temperature where it's a mist. That's the fog that comes o... |
If Muslims do not believe Jesus died on the cross, what exactly happened to the man? | My Arabic teacher explained it to me that some Arabs believe that Jesus was a dude and that Christ was a spirit that inhabited him and right before Jesus died Christ left him and went to heaven. And that is why he shouted "why have you forsaken me?" Because he didn't expect Christ to leave him. So Jesus did die on the ... |
Why did the Japanese side with the Germans in WWII? | I think even the most optimistic of the Germans at the onset of WWII realized that Germany wasn't a big enough country to conquer the entire world. Had Germany won in Russia and western Europe, and Japan not been defeated and eventually secured much of eastern Europe, sure, there's probably a decent chance they would'v... |
why do muscles get better the more you use them | It's efficient. A pound of muscle burns a dozen or so calories a day, just to sustain itself. By only building the muscles needed for your particular lifestyle, you save a lot of calories that can then be put toward reproduction or not starving. A fisher needs mostly upper body strength, a [persistence hunter]) needs c... |
Why were the the bodies of those who died of a fatal dose of radiation at the Chernobyl disaster still considered toxic and buried in Zinc lined coffins? | Two things. First, they probably got radioactive material from the accident site all over themselves. It's not just radiation that's escaping, it's also actual physical radioactive material that can contaminate body and clothes. This what they mean by nuclear fallout. So it's not like a bullet-riddled body, but more li... |
Why do certain policies work in countries such as Sweden and Germany, yet they "apparently" differ in America? | Yes these systems do work, but it is not possible for america to just switch from private health care is public. It would be like getting England to switch the sides of the road they drive on. It would be unimaginably expensive. Also, many americans think that anything socialized is bad and needs to not happenBecause, ... |
How are planes able to fly vertically. | Most planes can't fly straight vertically for any length of time without stalling . The ones that can have *extremely* powerful engines relative to their size, like in fighter jets, which provide so much thrust on their own that they don't need the lift from their wings to maintain their upward momentum. |
Why do you get startled/feel a rush of a adrenaline if you catch yourself falling asleep? | Are you talking about hypnic jerk ? That feeling where you jerk suddenly back awake sometimes when you're falling asleep? The prevailing theory is this is an evolutionary holdover from our earlier primate days, and is a danger response so our ancestors didn't accidentally fall out of trees. |
Why do delivery truck drivers wear high visibility jackets? | I would assume it has to do with Health & Safety regulations and legislation, I'm not sure about South Africa but in the UK, Health & Safety dictates that employees working in certain professions need to take certain precautions in their job, one of which could be the need for protective or high visibility clothing. I ... |
How can a sample of 2200 people represent the opinions of 315 million. | Imagine you have a massive jar of M & Ms filled with thousands of pieces. Now if I were to ask you what percentage of them were blue, yellow, brown, and red how do you do it most efficiently? You can dump all of it out and count them one by one but it would take forever. Or you can shake the jar until everything is ran... |
How does cutting tinfoil with scissors sharpen them? | This works by cutting several pieces of folded foil. As you cut the top layer of foil that layer is "pushed" sideways by the angle of the blade and rubs along the blade. As you cut more layers the combined pressure of the sheets means the blade is not able to "push" the next layer as sideways, so the next layer presses... |
- why some materials are more flammable than others. | In short, yes! When we talk about things "burning", what we actually mean is that the material is combining with oxygen , and releasing heat in the process. Some materials can combine with oxygen easier than others, and usually that is because of their molecular configuration and how their electrons are organized. |
Is there a biological reason why men don't appear as frightened as woman during dangerous situations? | Men have a lower level of fear response and suffer fewer long-term fear effects than women. [Survey] From a purely sociological standpoint, men further conceal their fear response because it is socially damaging to them in a way that it isn't for women. If you don't display fear, you tend to engender trust in others th... |
how does vaping vegtable glycerine, propylene glycol, and flavor concentrates (electronic cigarette juice) effect cilia trying to restore itself from cigarette smoke? | We don't know for sure yet because vaping is so new there aren't any long term studies. There have been studies about fog machines, however, which use similar glycol or glycerine based fluids. _URL_0_ It's a long section, but tl;dr exposure to glycol fog has been associated with negative respiratory effects by a number... |
How does Moore's law work. | They don't. It's not a law. He basically observed that: > the number of transistors that can be placed inexpensively on an integrated circuit doubles approximately every two years. *)* Not that it **has** to, but that it **seems** to do this when he made the statement, and is likely to continue to do so. He also said e... |
why will the sun burn something through a magnifying glass but if the sun hits eye glasses it wont burn your eyes? | Because glasses don't so much magnify as distort the light going through them to focus it where the eye needs it. You can create a heat spot with some lenses but you have to aim them directly at the sun and angle them just right so generally it's not an issue. |
What is the difference between a muffler, a suppressor, and a silencer If there are only at all. | a silencer is a made up thing movies use. a suppressor is a real thing that actually makes a gun sort of quieter but not even remotely silent or even quiet. A muffler is a car partA muffler goes on your car. Both the Silencer and the Suppressor are two terms for the same deviceA suppressor and a silencer are the same t... |
Why does Paper make such loud noises when I rip it? | It is made up of a lot of strands with their own tension, when you rip paper you are breaking a lot of strands at once. Its like a rapid fire popping sound of that tension being released. |
Don't franchises suck the money out of local economies? Say a small town with 13 of the same coffee shop franchises. Also strangling local independent businesses? | Franchises are owned by the owner of the franchise, not the corporation. It is a locally owned business, just not "independent" But its not really any different than an independent shop who buys their good to sell from outside the local area. Thats all a franchise is doing too, buying their good to sell from someone el... |
How long do you have to be dead before you're stopped being referred to as " the late"?. For example the late Margaret Thatcher sounds fine but the late Shakespear does not. | That's an interesting observation. This seems like it's likely a vague thing with hazy boundaries that no firm definition will suffice for. With that said, though, I 'd say a good general rule might be something along the lines of "Margaret Thatcher was alive during the living memory of the vast majority of people who ... |
How do animals have multiple births at a time and humans(most of the time) only have one | It all revolves around our brain and development. Humans have adapted to give birth to highly developed offspring with big heads to house our complex brains. Brain development, big heads, and organs capable of supporting the brain take a lot of time to develop from a single cell . There are also a lot of resources need... |
why do we need coin currency? Why not set prices to a flat dollar amount? | The fractal amounts are still meaningful in many transactions. For example, if gasoline could only be sold for $4/gallon or $5/gallon would make a huge difference to the vendor and the consumer alike. Also, some industries live off those fractions. Credit cards, for example, charge the vendor a small fraction of the ch... |
What is the ethical justification(s) behind being pescetarian? | I knew a girl once who was an outspoken PETA member and pescetarian. I think she just wanted to reap the moral superiority behind being a vegetarian, but liked fish too much. Not to make fun of Nonmeat-eaters. I know a very lovely Vegan women.Some people don't like eating meat due to the inhumane conditions in which th... |
Why do my hands sometimes feel like they "fell asleep"? | When you put enough pressure on a nerve or set of nerves they stop functioning correctly and your brain interprets that as pins and needles, pain or numbness. From the [National Institute of Neuroligacal disorderds and Storke]: > What is Pinched Nerve? > The term "pinched nerve" is a colloquial term and not a true medi... |
Why can't everyone be nice to each other? | I'd say for two main reasons. Humans love to break into tribes. With a clear divide between Us and Them. Typically that creates some sort of feeling of superiority or resentment. And also, treating someone like crap actually makes you feel good. It makes you feel powerful and important. It's why we like sarcasm and a g... |
How does diplomatic immunity work and why do we have it? | There have been cases in which the other country will forfeit diplomatic immunity. There was a famous case in D.C. where a drunk Russian diplomat plowed down some people in Georgetown, and the Russians eventually waived his immunity and extradited him back to the U.S. But they didn't *have to.* |
How do hotel comparision websites earn money? | Yes, they earn commissions. All of these online travel sites, whether for hotels or flights or whatever, are just travel agencies with a web-based storefront. Like traditional travel agencies, they earn a commission from the airline/hotel when they make a booking. |
How come when you step into the cold you always feel like you have to pee? | So your pee has to stay at a constant temperature at above average body temp. So you're body needs to put extra effort to keeping your pee at the proper temperature. When you go outside the rest of your body feels colder because you are using more energy to preserve your urine temp. If you pee, your core temp will rise... |
Why doesn't the US or any other country use napalm/chemical warfare in modern day wars like in Vietnam? | 188 countries have signed the Chemical Weapons Convention which is an arms control agreement that outlaws the production, stockpiling and use of chemical weaponsNapalm got a lot of bad press during vietnam, so now the army uses [white phosphorus] |
Where do metals originate from? | the coolest thing about all matter is that it comes from the stars - literally. Everything you see and everything you are made of is from an exploded star. Metals are fairly complex elements and so they come from only certain kinds of spent starsThey came from the same place that every other element on Earth heavier th... |
What happens to the sound on my headphones when they're not plugged in all the way? | "Getting half a stereo feed" is exactly what you're hearing. Headphones are what we call Stereo, or Left/Right. Only one feed or side of that stereo is what we call Mono. On your headphone plug you'll see it is stereo because there are 3 conductors on it. The tip, the ring, and the sleeve. On a mono plug it would only ... |
Why do other countries (outside of the US) have little or no commercial breaks on TV? | As an example, I believe England has their stations technically run by the government, kind of like PBS here The US on the other hand leases out different bands to companies so they have to pay for their costsYou may want to be more specific as many countries have just as many commercials on TV as the US doesTurkey has... |
Why are dogs not intimidated when a human snarls and shows their teeth? | Dogs are hard wired to recognize the body behavior of other dogs, not humans . Also, there is a lot of other body language going on besides just the noise and teeth baring at work that humans are physically incapable of reproducing. Edit: holy crap, make a quick half added paying and 24 hours later it explodes. 1. I di... |
what is my body doing in the "Aaaah, AAAAAAH-" moment of a sneeze? Why does it vary in length? | When you start to sneeze, it's because of some sort of irritation in your nose to release histamines. When histamines reach the nerve cells in your nose, it tells the brain to start what I'll call the Sneeze Sequence. The "Ah" sound you make is due to your body reflexively taking a large breath. During this time, the m... |
When a song gets "leaked", where does it come from? | When a band is recording a song or album, there are many people involved from the time they start recording until the media is sent out for sale. Any one of the people who are involved in that process can get a copy of the song or album and leak it. So, once the music is recorded and mixed, copies of that music are sen... |
Why is it that the brain remembers seemingly unimportant events and encounters but not information that can considered more useful? | I think it is the wrong question, because the brain *does* remember useful information. Just not every time. So the question is rather: why is the brain not *perfect* at distinguishing out what to store safely? If you accept "why expect perfection from humans?" as an ELI5 answer, then good. Otherwise my, this could be ... |
What causes small droplets of saliva to be launched out of your mouth sometimes when you open it. | I think you are refering to gleeking. In general, gleeking occurs when an accumulation of saliva in the submandibular gland is propelled out in a stream when the gland is compressed by the tongue. The stream of saliva is released in the general direction of the front of the mouth. If the mouth is open the jet may proje... |
Why is there a ringing in your ears in total silence? | Assuming there isn't anything in your parents house that actually emits that sound , then the sound is "imagined" by your brain, it's not actually there. It all comes down to your brain not receiving a signal for certain frequencies. This can have many causes , most common probably being damaged hair cells . Your brain... |
How do dogs decide where to use the restroom? | Dogs may circle their chosen bathroom site as a way to stomp down grass and weeds in order to have a place to poop. Originally, wild dog ancestors may have lived in areas with long or tall vegetation and they developed this instinctual behavior to maintain their hygiene while defecating. Another explanation could be th... |
Why does it feel so much better to get a massage than when we rub our own shoulders or feet, etc? | Because you are not relaxed when you are working on your body and focusing. When someone else does it for you you can relax and physically and mentally shut down. |
Why do Catholics pray to Mary and the Saints? | Catholics believe that the saints and Mary are very close to Jesus and God. They don't pay directly to saints and Mary, but rather they pray that they intercede for them. Meaning that the saints pray to God on their behalf, and since they are so close to God to put in a good word |
How come Google can search the entirety of the internet instantly but when I search my C: drive through the Windows Start Menu it takes forever? | It's because of indexes. When I want to find something in a textbook, I go to the index first. That helps me find the right page. If there was no index, I'd have to read every page until I found the right one. That could take a long time. Your C: drive probably doesn't have an index. It is possible to create an index, ... |
How do fans work if all they do is warm the air? | While, technically, heat is the result of molecules moving faster, in practice you need to make air move hundreds of miles per hour for it to become measurably warmer. The little 10mph breeze from a fan is basically an immeasurable increase in the energy of that air. Our bodies are hot so the air around us heats up. A ... |
Why Gravity/General Relativity and Quantum Mechanics don't fit togeather | There's something physicists do in quantum field theory called renormalization. Basically, you often end up with values that are infinity, but you can "renormalize" them by subtracting another infinity of the same "size." This is mathematically and logically weird, but it turns out to work. With the electromagnetic, st... |
Why is "they are" correct grammatically, while "everyone are" is incorrect, when they are both used as singular pronouns? | Think of 'everyone' as 'each and every one'. 'One is', singular. 'They' is used when there is a plurality of people *or* when there are plural options for addressing someone and you don't know which to use. 'They are', plural."They are" is plural. It's the fallback for when I don't know if a person is a he or a she, so... |
the consequences of not bailing out the big banks and companies | When a company of that size goes under it's not isolated. You have to understand that our money is built on debt and the expectation that that debt will mostly get paid. Generally what happened is you own stock in Company A. A own stock or debt in B and B in c and c in d. Now D fails. This brings down c to a as well. S... |
Why are most company head quarters in California? | California is the most populous state and it's been a major tech hub for several decades now. But there are plenty of major companies that aren't headquartered there- financial firms are more likely to be based out of New York or Chicago, defense companies are more likely to be based out of Washington DC or nearby in M... |
Why American toilets don't have a half-flush feature? | It hasn't really caught on as the standard yet in North America because – compared to Australia – the United States and Canada have very large sources of fresh water . North America also tends to have a lot more precipitation, so rainwater is helping to replenish fresh water sources all the time. Basically there is no ... |
Why does saliva sometimes spray out of your mouth like a shower when you yawn? | It's caused by accidently putting pressure on the saliva gland under your tongue. The slang term for this is 'Gleeking' .Ok I feel like a freak now, I do this all the time. You can control it by kind of folding your tongue back under you front teeth, so the underside i pointing out, then press your jaws down on each ot... |
Why does ice sink in warm grease but float in cold? | Like most things, grease expands as it heats up. As a result, cold grease is denser than warm grease, so I've can float in it. |
How the street names of New York are organised e.g. 30 & 5th. | The roads are set up like a grid. There will be a Central St/Ave tha is where the numbering starts. One direction will 1st Ave North, 2nd Ave North, 3rd Ave north, etc. The other will be 1st Ave South, 2nd Ave South, 3rd Ave South. Their cross roads will often be be the opposite 1st St, 2nd St, 3rd St. The "St" will of... |
Why does cannibalism have negative side effects? | Any disease that the person who died has is obviously capable of infecting other humans. And societies tend to look down on eating their own, because it would be seen as encouraging murder. But otherwise, yes, meat is meat. It is said to taste a lot like porkCannibalism is a great way to transmit protein based diseases... |
What is the difference between shaving using a trimming machine , a razor or waxing besides the physical method and why is one preferred over the other | A trimmer leaves the hair partially there and is merely cutting it down to a certain length. You use this when you want to keep your beard but groom it, and trimmers are often used when doing normal haircuts for the areas that are going to be relatively short. A razor cuts much closer, shaving off almost all of the exp... |
How do aquired tastes work? | It doesn't smell any different to you as it does to me. You have created associations in your brain between the smell, the taste, and the effect. You enjoy the effect, so you start to enjoy the smell because you anticipate the result. It still has the same smell though chemically to your smell receptors in your nose. Y... |
why does milk taste so good after eating something with syrup or peanut butter? | **Likes disolve likes. Polar substances like water disolve polar substances like sugar. Non-polars like oil, fat, and gasoline dissolve non-polars. We've all seen this, oil doesn't mix with water. Chocolate and peanut butter have fat which don't disolve well or at all in water, but do in milk because milk has fat.** |
Why do we get blisters when wearing new shoes for the first time? | The average foot is covered with fairly soft and scrapeable skin. That skin wears away when it's rubbed or tugged against something over and over again. If the constant pulling action is along the surface of the skin and it's in short quick jerks, it can actually separate the top layer of your skin from the bottom. Flu... |
The Difference between a Mechanic, Technician, Engineer, etc. I hear the terms used (seemingly) interchangeably. | Mechanic generally only means someone working on engines. Technicians are doing practical work with something at least vaguely technical. You could call a mechanic an auto-mobile technician or something if you want to. An engineer generally mean a university-trained professional that designs new systems; they often lea... |
Can electric appliances cause WIFI disturbance? | Motors with brushes have some arcing associated with them. The arcing emits a very wide range of frequencies which can interfere with any consumer radio system. _URL_0_WiFi is an electric signal using a wavelength. I doubt the vacuum motors induced magnetic field would be strong enough to alter the WiFi signal. But the... |
Why do we chill when we are actually burning with fever? | There's a part of your brain that controls your temperature called the hypothalamus. When you get a fever, your immune system makes your hypothalamus change your desired temperature higher. Your body basically wants to get warmer, so it makes you feel cold. When you feel cold, you try to get warmer yourself and you shi... |
Why do televisions often cut the end off of recorded programs, even if space is available? | They often have a schedule for advertisers and later programming, and the program was "fudged" in that time slot. Sometimes programs, especially live broadcasts, go over or under time by a few minutes, but shows later in the day have to be on at a certain time. Since everything is set to run in the same time intervals,... |
What does "meta" actually mean? | Meta means "viewing things at the next higher conceptual level". For example, an analysis might study the effectiveness of a particular drug. A meta-analysis studies multiple analyses. Meta can **sometimes** result in self-reference, like a TV show making a joke about being a TV show. But saying meta is the same as sel... |
Student debt is making it harder for millennials to buy houses in stead of renting. What effect will this have on the economy? | Student debt is not just dragging down the housing market, it's dragging down the entire economy. Reducing the discretionary spending power of the currently largest demographic block in the US is obviously detrimental to the entire economy. Part of why the US's growth rate in the past 10 years has been less than stella... |
Why do we need car dealerships? | Same reason we need any store, some people like to try things out before they buy itAs I recall, the "car dealership" model was put in place to prevent Ford from having a monopoly on the car selling industry. A new car manufacturer wouldn't have to compete with the entirety of Ford, it would have to compete with a numb... |
How is it possibly true that "the Girl Scout Cookie Program is the largest girl-led business in the United States" - is it really led by girls? | I believe that almost all the upper level management of the Girls Scouts is also female.Their CEO is currently Anna Maria Chávez, and if you look at their [list of past leaders], it's pretty much entirely females. So yes, it's a very large business that's led almost entirely by women. I'd say their material checks out. |
Where have all the college-student jobs gone? | Well, for starters, in 1979 you could pay for an entire semester of college by working for two weeks at minimum wage. In 1993, you could pay for a week of school with 20 hours of minimum wage work a week. Now, you have to work 48 hours a week of minimum wage to pay for school. So, it makes more sense to take out a stud... |
Why is it always so cold in the hospital? | Bacteria and viruses don't survive as long on cold surfaces. Making it a bit chilly saves lives from infection.Hospitals and other healthcare facilities have high air change rates, sometimes up to 25 air changes per hour for an operating room. So every hour the entire volume of air in that space is being supplied and e... |
home come drinking salt water makes you vomit, but having something like chicken broth doesn’t? Even though it has water and salt in it | Pretty sure there's way more salt proportionally in ocean water than even the saltiest chicken broth.Salt water? 🤔 Like drinking water from the ocean? |
Why does the hair on your head need to be cut continuously but the hair on the rest of your body knows when to stop? | All hair have a certain lifespan, your eyebrow and eyelashes can only grow for a month or two before they die and fall off. Your hair on the other hand can grow for about 7 years The hair on your head also has a terminate length. It is just much longer than body hairIf you let your head hair grow normally, it would sto... |
Why do I crave something specific when I'm hungry and some times I don't know what I want? What is happening in my body? | Sometimes your body will be lacking so kind of mineral/nutrient, so it will direct you towards foods containing that nutrient. It could also just be dependent on sensory cues. |
Why do most rappers say "uh, yeah" before a song? | It's just a way for rappers to find their rhythm and get into the song. It's the equivalent of bobbing your head to the beat or something. |
Why do bubbles have that strange rainbow kinda color? | Very thin films take on a sharp color. This is due to light reflecting off of both surfaces of the film and interfering with itself. This happens with a bubble, but the film is not uniform in thickness. So instead of getting one very distinct color, [you get rainbow patterns]. |
What are the current Problems with nuclear Fusion? | You are creating something as hot as a star. No physical material we have is strong enough to withstand that kind of heat and pressure. Any metals, ceramics, even carbon nanotubes would melt and rupture instantly. So the reaction is contained by floating it inside of a magnetic field so it doesn't actually touch anythi... |
How are denial of service attacks still possible? | Same reason McDonalds can't do anything about one guy coming in an ordering 30 large fries and holding up the entire store for a half hour. That's basically what a DDoS attack is. There are counter measures that these companies take, but ultimately there is little they can do that would not also negatively effect their... |
Why are simple antibiotics not available without a prescription? | Because antibiotic resistance is a huge problem. People overuse antibiotics for things that sometimes don't even need them, like the flu which is a virus and not bacterial. If the general public were able to purchase antibiotics off the bat then resistance would go up massively. Plus, there are so many different types ... |
This difference between running inside and running outside | ELi5 isn't really for questions about personal health so this has been removed. If serious ask a doctor. |
What is the difference between emotional infidelity and a close friendship? | There is no big book of relationship regulations. Discuss relationship expectations with your partner. But personally if my partner expected me not to be close with my friends, I would not accept that. |
Why don't laptops have a slot to clean fan dirt? | The more user-servicable you make a piece of electronics, the bulkier and less reliable it will be. People generally make their purchasing decision based on aesthetics or specs and not on the ease of maintenance. This is the same reason that iPhones don't have removable batteries. |
- how can you get stretch marks on your bum from sitting down too much? | Your can't. You get stretch marks from rapid weight gain or growth. So if you put on a lot of weight in your hips and butt you can get stretch marks there. Something you can get from sitting down too much are pressure sores commonly called bed sores, or hemorrhoids. |
This morning I read that the universe is expanding at a rate of a billion miles an hour in every direction. Does this include the space within in my own body? | Imagine blowing up a balloon. The balloon gets bigger, and two points far apart on the balloon get further apart very quickly. But two point which are close together move further apart only very slightly as the balloon inflates. The universe is a bit like that. So the space which your body exists in *is* expanding, but... |
When a tennis player challenges an in-out call, how is the CGI clip generated to make the right call? | Cameras track the ball's movement with a technology called "computer vision". This is a powerful tool that is used to identify rejects in an assembly line, and what self-driving cars use to navigate, for example. |
when I sleep in my bed and my hand touches the concrete wall, it feels really cold but when I touch my wood bedframe it's warm. | Hotness/coldness isn't a measure of the temperature of the object. It's a measure of how fast the heat enters or leaves your hand. A metal bar feels colder than a wooden one on winter's night because metal is a better conductor of heat. It literally sucks the heat out of your hand faster than wood. Concrete isn't as go... |
Why exercise speeding up your heart rate is good, but drinking caffeine to speed it up is bad? | Ok, best guess here, only because no one else has bothered to give a decent answer, would be that exercising to keep your heart rate up is only a benchmark for how you should feel to know you're doing it right. Having an increased heart rate alone is not the point. Obviously when you're exercising, it effects a lot mor... |
How do Blood Thinners (Rat Poison) work? What makes the blood "thin"? | Your blood contains things called platelets - these are basically a type of cell whose job it is to plug any holes that might form in your bloodstream. And normally, these holes and tiny tears happen *all the time*, but you never notice them because your platelets plug said holes and prevent any leakage. Blood thinners... |
When a woman gives birth how long does it take for her stomach area to go down? | It's different for each woman and it just depends on her body type, whether she delivered vaginally or by cesarean, and her activity levels before and after pregnancy. I mean, she will immediately not look pregnant anymore once the baby and placenta are out, but she won't be back to her pre-baby size for a while, and s... |
Why can't we just throw satellites or sensors into a black hole to see what happens? | The nearest black hole is 1600 light years away, for a start. Even if we have a black hole at easy reach the definition of a black hole is that it is so massive that its escape velocity is faster than the speed of light. Information can't move faster than light, so if we sent a satellite into a black hole it and all of... |
From a cancer-risk point of view, is 10 minutes in the sun each day for 12 days equivalent to 2 hours in the sun during one day? | If you burn, it's definitely not equivalent. When you get burnt, your skin is showing signs that cells are actually dying. Your body contains mechanisms to deal with the DNA damaged caused by UV radiation, but when these mechanisms become overwhelmed, your cells need to abort and kill themselves to prevent skin cancer.... |
Why has Africa generally been unable to develop like the rest of the modern world? | It's not that Africa hasn't been able to develop, it's been actively undermined. Nearly all of the continent was under colonial administration until the end of World War II. It's spent hundreds of years having its resources siphoned away and having its political systems eroded. Once independence finally came, it was gr... |
How do those penny auction websites work? | The price of the items is dirt cheap. But what they fail to mention is that you have to pay for bids and the auctions end times extend after every bid. So while you may have purchased that new laptop for $10, you spent $500 in bids, just like all the losers of the auction also spend hundreds in bids.tl;dr: The _winner_... |
how do scientist discover new things about the universe? | They do it with the scientific method: 1) Conjecture that something "could" be possible . 2) Create an experiment that will test your hypothesis in such a way as to be sure you are actually measuring what you think you are measuring. 3) Use the results of your experiment to classify your initial hypothesis as valid or ... |
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