How do pigeons know where to go, when used as means of transporting messages?

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• How do pigeons know where to go, when used as means of transporting messages?
• How do molecules have such unique properties just being made up of atoms?
• How are islands connected to the internet?
• Why are Bio-Fermentors always tall and narrow?
• What in our universe is constant and not relative?
• If a young child is the recipient of an organ transplant, are they expected to be on Immunosuppressant drugs for life or is it possible that, atleast some organs, can be "replaced" on the cellular level in a ship of theseus sense?
• Is over or under generating truly possible in terms of matching generation to load on the power grid?
• What cause a jet engine to "flame out"?
• When an electron quantum tunnels, does it physically move through a barrier or does it "teleport"?
• Anti-deuterium from proton collisions ?
• In the time of supercontinents, where was the sea level and how does this affect maps?
• What causes lightning to form jagged shapes and strands as it comes to the ground?
• Why do dogs howl at seemingly random hours of the night?
• Why do we wake up with bad breath?
• What is the difference between Ergodic hypothesis and postulate of equal probabilities in statistical mechanics?
• How do scientists know how many animals of a specific species there are (are are able to give estimates)?
• [Biology] How much did Rosalind Franklin contribute to the discovery of DNA's double-helix structure?
• Why were Space Shuttle satellite deployment missions crewed with up to 7 people?
• death by Drowning: do people die because of the water in the lungs or lack of air?
• What's the science behind sunsets/sunrises? Why do some make more vibrant colors than others?
• If someone burnt 3,500 calories in a workout, at what time/point would they be 1 pound lighter?
• Does big flying objects like asteroids when passing through bigger celestial bodies like Earth or Moon alter their gravitational path?
• Is there any known correlation between smell or flavor (bitter, sweet, etc) and nutritional value?

How do pigeons know where to go, when used as means of transporting messages? Posted: 15 Jan 2019 02:30 AM PST submitted by /u/sayn14 [link] [comments]

How do molecules have such unique properties just being made up of atoms? Posted: 14 Jan 2019 08:22 PM PST I dont get how molecules can tuen out to have such radical properties, when atoms themselves are so bland? Like if you put a bunch of lego pieces together it'll still be a lego conglomerate, but if you put a bunch of atoms together you get an interesting substance. Its like making a lego set from bland legoes but afterwards when the set is done it magically glows or suddently becomes liquid at room temp. Like lets say pure carbon is just pencil lead or a diamond. Then you add a bunch of hydrogens to it, which is literally just adding a few more protons and you get oily fuel. Or you get the synthetic smell of bananas. Just by adding some atoms to it. submitted by /u/kaze_ni_naru [link] [comments]

How are islands connected to the internet? Posted: 15 Jan 2019 05:26 AM PST Hello there. I'm wondering how islands are connected to the internet? Is it a matter of a simple cable connection? And in the case of larger islands, (Ireland or Britain), are they connected at multiple points or in conjunction with satellites? Cheers! submitted by /u/stickyteeth [link] [comments]

Why are Bio-Fermentors always tall and narrow? Posted: 15 Jan 2019 02:17 AM PST Is it because it makes diffusing air or mixing the broth easier? Or is there a more sciency reason? Thanks! submitted by /u/MicrowavedPizza [link] [comments]

What in our universe is constant and not relative? Posted: 15 Jan 2019 04:12 AM PST If I'm not mistaken the speed of light in a vacuum is always the same no matter where you are in the universe. That is a speed. Are there other units which arent relative. Is there a size which it constant? (E.g the size of an atom, but i don't think that is constant). Or a weight, a temprature, another speed etc submitted by /u/swegling [link] [comments]

If a young child is the recipient of an organ transplant, are they expected to be on Immunosuppressant drugs for life or is it possible that, atleast some organs, can be "replaced" on the cellular level in a ship of theseus sense? Posted: 14 Jan 2019 06:05 PM PST submitted by /u/GrandpopLester [link] [comments]

Is over or under generating truly possible in terms of matching generation to load on the power grid? Posted: 15 Jan 2019 07:03 AM PST When load increases frequency lowers until governors open more to restore frequency to nominal (60.00 Hz US). During these transients however is MW produced constantly matching MW consumed? The way I understand it you're never truly under or over generating, you're deviating from nominal frequency. Note, I understand that individual entities are over/under generating constantly in relation to other entities, and this is measured by their ACE equation. submitted by /u/blaisews [link] [comments]

What cause a jet engine to "flame out"? Posted: 15 Jan 2019 03:52 AM PST When a jet engine is deprived of an oxidiser they shoot a flame at the back. It seems counterintuitive to me because shouldn't this prevent combustion from occurring? Could someone please explain this to me? submitted by /u/bonsear [link] [comments]

When an electron quantum tunnels, does it physically move through a barrier or does it "teleport"? Posted: 15 Jan 2019 05:29 AM PST Is there even a actual physical barrier or do people just use it as a way to explain tunneling? Any details about this subject would be welcomed. I have a very rudimentary understanding of quantum tunneling, so please excuse my terminology. submitted by /u/chanpat [link] [comments]

Anti-deuterium from proton collisions ? Posted: 15 Jan 2019 03:19 AM PST Is there any experimental evidence of antimatter deuterium produced as a daughter product from a proton+proton collision ? Would appreciate a published citation. submitted by /u/Loquadi [link] [comments]

In the time of supercontinents, where was the sea level and how does this affect maps? Posted: 15 Jan 2019 01:09 AM PST Its common to see images of former supercontinents with today's continent or even country boundaries overlaid (e.g. Pangea) and the landmasses seem to neatly fit together like a puzzle. But as I understand sea levels have fluctuated hundreds of metres across the same time periods which would presumably place vast areas underwater. For example for Pangea (see link above) ~350m years ago the sea level might be 200m higher than today, presumably putting much of the modern world underwater including eastern north america, much of australia and russia. Maybe I'm missing something here. Are these maps wrong? Or have the continents changed in height? Thanks in advance submitted by /u/OstapBenderBey [link] [comments]

What causes lightning to form jagged shapes and strands as it comes to the ground? Posted: 14 Jan 2019 06:12 PM PST submitted by /u/brantgerald [link] [comments]

Why do dogs howl at seemingly random hours of the night? Posted: 15 Jan 2019 02:42 AM PST I was outside late tonight, and was treated to a choir of distant doggos howling away with each other. This made me wonder if there is some kind of instinct responsible for this behavior, and also why they feel compelled to join other howling dogs? submitted by /u/Brotatochips_ [link] [comments]

Why do we wake up with bad breath? Posted: 14 Jan 2019 03:09 PM PST submitted by /u/PayterG [link] [comments]

What is the difference between Ergodic hypothesis and postulate of equal probabilities in statistical mechanics? Posted: 14 Jan 2019 09:18 PM PST It sounds like both the hypotheses states that each available microstates will be equally occupied. What am I missing? submitted by /u/iBiple [link] [comments]

How do scientists know how many animals of a specific species there are (are are able to give estimates)? Posted: 14 Jan 2019 09:07 PM PST I see this a lot on many informational pages about animals but never know where these numbers come from. EDIT: the title is supposed "or are", whoops submitted by /u/ps134 [link] [comments]

[Biology] How much did Rosalind Franklin contribute to the discovery of DNA's double-helix structure? Posted: 14 Jan 2019 05:33 PM PST I've tried to Google this answer after Watson's sexist/racist beliefs recently came up in the news again. Everything I google basically tells me that they stole her data/didn't credit that data. Some pop-sci and bloggy type articles I read imply or state that Franklin discovered DNA's shape. Can anyone explain this situation to me? Is there something that kept Franklin from the "Aha!" Moment specifically? How much did she discover or understand about what her data proved? How much/what is lost to time? submitted by /u/VagabondingCanada [link] [comments]

Why were Space Shuttle satellite deployment missions crewed with up to 7 people? Posted: 14 Jan 2019 07:14 PM PST Most early Space Shuttle missions were just deploying satellites, something we have pretty much always been able to do without requiring human intervention. Why were those missions crewed by up to 7 astronauts? submitted by /u/Serialk [link] [comments]

death by Drowning: do people die because of the water in the lungs or lack of air? Posted: 15 Jan 2019 03:51 AM PST not sure if right sub but yeah. submitted by /u/TheMadCherry [link] [comments]

What's the science behind sunsets/sunrises? Why do some make more vibrant colors than others? Posted: 14 Jan 2019 02:09 PM PST submitted by /u/msgreenman [link] [comments]

If someone burnt 3,500 calories in a workout, at what time/point would they be 1 pound lighter? Posted: 15 Jan 2019 03:24 AM PST Excluding sweat and water weight, when does your body actually use up that pound of fat? submitted by /u/quickcrow [link] [comments]

Does big flying objects like asteroids when passing through bigger celestial bodies like Earth or Moon alter their gravitational path? Posted: 14 Jan 2019 06:52 PM PST submitted by /u/asatomasadgamaya [link] [comments]

Is there any known correlation between smell or flavor (bitter, sweet, etc) and nutritional value? Posted: 14 Jan 2019 10:57 AM PST Curious as to what taste buds are detecting, chemical composition? submitted by /u/Fear_ltself [link] [comments]

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A flu shot is a vaccine, right? But they seem to be far less reliable than other vaccines (I know many people who get flu shots each year then get the flu). What is the reason for this, and are flu shots really that important?

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• A flu shot is a vaccine, right? But they seem to be far less reliable than other vaccines (I know many people who get flu shots each year then get the flu). What is the reason for this, and are flu shots really that important?
• How did scientists calculate the amount of hydrogen left on the sun and thus calculated the age of the sun?
• Can you grow a plant just by the light from a wood fire?
• Is the universe itself spinning just like galaxies do?
• Is there any difference between mine salt and sea salt? How do we have 2 seemingly different sources of salt?
• How does a strong magnet fall in a copper tube?
• How massive can a rocky planet be?
• How do we know it takes plastic 1k yrs to decompose if we used plastic for only 100 yrs?
• Is there any difference in getting vitamins and minerals from a multivitamin as opposed to actual food?
• Does the efficiency of a nuclear power plant depend on the level of uranium enrichment? And if so, where is the “sweet spot” of enrichment?
• Is it possible to have very vivid false memories?
• What is spreading pressure and how is it related to the description of multicomponent adsorption?
• How do space agencies prevent germs and bacteria on their rovers (Mars Rover) from contaminating the planet they visit?
• Why doesn’t chemotherapy have a 100% success rate?
• How does a receiver antenna physically recieve em waves? Trying to understand bluetooth radio.
• Why are all the continents wider in the north?
• Why does a positive caster angle in cars lead to the rise of a self-centering wheel effect in cars? Specifically what is the physics behind it?
• Can isolated mountains like Erebor, the Lonely Mountain from LOTR actually exist in real life?
• Since DNA is changed by transcription errors/ionizing radiation, do different parts of your body have very slightly different DNA?
• Is there a reason for rocky planets to be closer to a star and gas giants to be farther, or is that grouping in our solar system coincidental?
• How big can a planet get??
• How is a stock's price determined?
• Can an object move through time independent of space?

A flu shot is a vaccine, right? But they seem to be far less reliable than other vaccines (I know many people who get flu shots each year then get the flu). What is the reason for this, and are flu shots really that important? Posted: 14 Jan 2019 07:45 AM PST submitted by /u/magicscreenman [link] [comments]

How did scientists calculate the amount of hydrogen left on the sun and thus calculated the age of the sun? Posted: 13 Jan 2019 10:36 PM PST submitted by /u/iwannaknowwhoami [link] [comments]

Can you grow a plant just by the light from a wood fire? Posted: 13 Jan 2019 02:41 PM PST Also, would there be a difference in growing a plant by a wood fire or a natural gas fire, given both flames were the same general brightness? Is it possible to grow food by that firelight? submitted by /u/academicpursuit [link] [comments]

Is the universe itself spinning just like galaxies do? Posted: 13 Jan 2019 03:01 PM PST submitted by /u/HelpMeDevices [link] [comments]

Is there any difference between mine salt and sea salt? How do we have 2 seemingly different sources of salt? Posted: 14 Jan 2019 03:50 AM PST submitted by /u/datvm [link] [comments]

How does a strong magnet fall in a copper tube? Posted: 13 Jan 2019 08:41 PM PST It can be shown when a magnet is dropped through a copper tube its change in magnetic flux creates a retarding force therefore slowing the magnets rate of decent. It can also be shown that this flux is proportional to the change in the magnets velocity. My question plainly is what happens when the magnets "strength" or corresponding electromotive magnitude approaches infinity? At first I assumed the magnet would no longer move but if that where the case there would no longer a velocity, resulting in the retarding force becoming zero. It seems the magnet would neither fall or not fall. The paradox at hand and my lack of knowledge of Lenz law has prevented me from studying this case in any intimate mathematic detail. Perhaps such a strong magnet and uniform field would not initiate enough change in flux to create a retarding force at all. What could this say about uniform fields and "infinitely strong" sources? submitted by /u/Bobasheto [link] [comments]

How massive can a rocky planet be? Posted: 13 Jan 2019 10:10 AM PST Is there an upper limit to how much mass a rocky planet can have? If so what happens beyond this limit? submitted by /u/melkor237 [link] [comments]

How do we know it takes plastic 1k yrs to decompose if we used plastic for only 100 yrs? Posted: 13 Jan 2019 02:18 PM PST submitted by /u/1WhiteDude [link] [comments]

Is there any difference in getting vitamins and minerals from a multivitamin as opposed to actual food? Posted: 13 Jan 2019 07:40 AM PST For example, could one live a healthy lifestyle by eating a a good mixture of whatever fats, carbohydrates, and proteins they prefer plus a multivitamin? submitted by /u/IntoTheMystic1 [link] [comments]

Does the efficiency of a nuclear power plant depend on the level of uranium enrichment? And if so, where is the “sweet spot” of enrichment? Posted: 13 Jan 2019 07:30 PM PST Context: I was reading a little on the Iran nuclear deal in the news and they mentioned that the deal limited them to a pretty low percentage, but the Iranians had considered making a plant that could produce up to 20% enrichment. A quick google search suggested 80-90% enrichment is needed for weapons.... so what would the higher enriched uranium be good for? submitted by /u/CharlesV_ [link] [comments]

Is it possible to have very vivid false memories? Posted: 13 Jan 2019 01:48 PM PST So a good while ago, I had a traumatic experience where I was blackmailed during a conversation with 3 people/strangers that I met somewhere. Ever since, I have been medicated for severe anxiety and depression and it ruined my life. After 3 years of digging, I still can't find a trace of these individuals. Nothing, zelch. I was on both adderall and diazepam at the time and i was a bit exhausted/sleep deprived. I am starting to question if the conversation even happened. I recall the memory with extreme clarity. Is it possible to have full on vivid and traumatic false memories? submitted by /u/Benzorepent [link] [comments]

What is spreading pressure and how is it related to the description of multicomponent adsorption? Posted: 14 Jan 2019 02:40 AM PST submitted by /u/Tricert [link] [comments]

How do space agencies prevent germs and bacteria on their rovers (Mars Rover) from contaminating the planet they visit? Posted: 13 Jan 2019 08:50 AM PST Or do they even try and prevent it? Am I correct in thinking that the scientists have something in place to stop living organisms/bacteria contaminating Mars when objects come in contact with the planet? If so how is it done? submitted by /u/blueboy1980 [link] [comments]

Why doesn’t chemotherapy have a 100% success rate? Posted: 13 Jan 2019 11:57 AM PST From what I understand from A level chemistry chemotherapy uses cisplatin to stop the replication of the DNA in cancer, and subsequently affects the healthy DNA aswell. The Cl is displaced as the platinum bonds with the guanine in the DNA of the cancer, so if this stops it replicating why does chemo not have a 100% success rate? submitted by /u/WombatNipples65 [link] [comments]

How does a receiver antenna physically recieve em waves? Trying to understand bluetooth radio. Posted: 13 Jan 2019 09:30 PM PST Just out of generally curiousity , I'm wondering how an anetenna "recieves" the em waves / radio waves. Not sure how to google this sort of question. Does an electromagnetic field induce an electric current in the anetnna, sending electric current patterns (pulses or waves) down the antenna? Then the antenna transfers the current to wherever, like a wave interpreter module or something. If this is the case, How would a Bluetooth antenna know which set of waves or current patterns to select? If they communicated on a different channel then other types of wireless antennas , how would a device work if a Bluetooth antenna was sitting in the middle of ten other blue tooth devices transmitting sending a bunch of signals? submitted by /u/horrofan [link] [comments]

Why are all the continents wider in the north? Posted: 13 Jan 2019 01:39 PM PST All the continents (except Australia) are wider in the north and thinner in the south, why is that? submitted by /u/Yeetgodknickknackass [link] [comments]

Why does a positive caster angle in cars lead to the rise of a self-centering wheel effect in cars? Specifically what is the physics behind it? Posted: 13 Jan 2019 12:55 PM PST submitted by /u/mp1101 [link] [comments]

Can isolated mountains like Erebor, the Lonely Mountain from LOTR actually exist in real life? Posted: 13 Jan 2019 08:40 AM PST You usually find a mountain as a part of a mountain chain. Is it possible for geological phenomena to favor the formation of a fairly large mountain that exists in isolation, without being a part of a mountain chain? submitted by /u/bbqking6969 [link] [comments]

Since DNA is changed by transcription errors/ionizing radiation, do different parts of your body have very slightly different DNA? Posted: 13 Jan 2019 01:52 PM PST DNA is changed... for better or worse (usually the latter) by transcription errors or by getting hit by ionizing radiation. But IF that cell survives to replicate, it's not like that strain of DNA will eventually be everywhere in your body. A mutated skin cell that still survives won't eventually become a blood or lung cell. So my real question is this: Could you take samples of dna from all over your body and come up with the DNA you had when you were born? Aka YOUR genetic code before any errors were made? (Minus the telomeres of course, once those are lost it's not like you can figure out what they used to be, but it doesn't matter cause you can just throw some gibberish on there to extend them.) submitted by /u/corrado33 [link] [comments]

Is there a reason for rocky planets to be closer to a star and gas giants to be farther, or is that grouping in our solar system coincidental? Posted: 13 Jan 2019 11:18 AM PST submitted by /u/Nerrolken [link] [comments]

How big can a planet get?? Posted: 13 Jan 2019 11:49 AM PST I feel like most planets fall within a certain size but I don't know why size would have anything to do with a clump is mass. What would prevent a planet from becoming the size of our solar system or something? Would it turn into black hole? submitted by /u/VirtuousHomie [link] [comments]

How is a stock's price determined? Posted: 13 Jan 2019 08:17 AM PST I understand supply and demand and so forth, I'm asking how the actual number that goes on the sidescrolling screens is determined. What is that number, exactly? Who or what gets to decide what the displayed number is? I'm guessing it's the highest price that a share of that company is sold for, but I think I'm missing something since the price fluctuates so fast that you need supercomputers linked straight to the stock market to keep up. My google-fu has failed me on this one, so I'm hoping someone here has an answer for me. submitted by /u/baldman1 [link] [comments]

Can an object move through time independent of space? Posted: 13 Jan 2019 11:22 AM PST To preface I'm not a physicist of any kind so forgive me if this is a daft question in the field. But I was thinking about how in Doctor Strange, the Dr. moves an aple through it's timeline and does so without moving it through space. To clarify; if 3D space is defined by the axis' X, Y, and Z on a graph. An object can move along one axis without moving on the others. If a 4th dimension of time is added to the model and defined by the axis T, could an object move along the T axis without moving on the others? Thanks in advance. submitted by /u/GJokaero [link] [comments]

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Can Three of the Four Types of Volcanic Eruptions Happen Underwater?

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• Can Three of the Four Types of Volcanic Eruptions Happen Underwater?
• At the heat death of the universe, will most black holes eventually merge due to the incredibly long timescale before they evaporate from Hawking radiation, or will most black holes not merge due to the sheer vastness of space between them?
• Why did the matter that formed our solar system form 8 planets instead of clumping into a bigger star?
• How to determine the melting point of a mixture, which is composed of substances having different-different melting points?
• We know that introducing forests into dry/hot climates has the potential of changing local climates into something much more habitable. What would be the effect on local climate of artificial afforestation in barren but wet/cold places?
• Why does this wrench with 50,000 amps current running through it appear to heat up from the edges inward?
• How is it possible to measures very high temperatures?
• What does an Atom actually look like?
• Is it possible for a star to have a low mass yet have a large volume?
• Do different gasses have different drag coefficients? Do they generate different amounts of resistance based on their molecular structure?
• Occasionally we see plans to “bring back” extinct mammals like Mammoths, but in reality they would be Mammoth-Elephant hybrids. Would this method work with non-mammals like bringing back the Moa using other ratites like the Emu or Ostrich?
• Why is the entropy of a continuous random variable not infinite?
• How do I calculate the force and collision time for an object which an impulse acts upon due to an inelastic collision?
• Why are photo files different sizes?
• How does temperature work in space?
• Deep-sea brine pools—how do they form, and do they make sounds?
• Can Radiation Kill on Contact or Cause Immediate Physical Damage?
• How do telescopes “hold still” during the long exposure times needed for images like the Hubble deep field photos?
• Why do we see from the front of our eyes if the retina is in the back? Why don’t we see the inside of our eyes?
• If two planes fly by one another in opposite directions, each going Mach 0.5, would there be a sonic boom? Or one that only the pilots could hear?
• Regarding statistics, of what significance is the mode? Are there any useful applications?
• If tick is attached to the host and put under water, can it take oxygen from host blood to stay alive?

Can Three of the Four Types of Volcanic Eruptions Happen Underwater? Posted: 12 Jan 2019 04:48 PM PST A volcanic eruption is measured in two constants--gas and viscosity. For clearance, low viscosity is like squirting water off a nozzle, whereas high viscosity is like squirting caramel off a nozzle, which takes more effort to do, which ultimately makes it more dangerous. In geology, there are four different kinds of volcanic eruptions: Low Gas + Low Viscosity = A quiet lava flow. High Gas + Low Viscosity = A fire fountain eruption. Low Gas + High Viscosity = A dome-building eruption. (This sort of eruption doesn't reach critical right away.) High Gas + High Viscosity = A Ring of Fire explosion. These sorts of eruption are impressive enough on land, but in the event of someone doing some serious worldbuilding, this question puts three of the four types underwater. Type #1 has long been confirmed to happen underwater, but the oceanic differences in temperature and pressure have produced a different result called "pillow lava". ​ Is it possible for eruption types numbers 2, 3 and 4 to occur underwater? If yes, then would the oceanic differences in temperature and pressure make them look and act differently from how they have acted above sea level? submitted by /u/JohnWarrenDailey [link] [comments]

At the heat death of the universe, will most black holes eventually merge due to the incredibly long timescale before they evaporate from Hawking radiation, or will most black holes not merge due to the sheer vastness of space between them? Posted: 13 Jan 2019 07:16 AM PST submitted by /u/Porencephaly [link] [comments]

Why did the matter that formed our solar system form 8 planets instead of clumping into a bigger star? Posted: 13 Jan 2019 03:33 AM PST submitted by /u/Martijngamer [link] [comments]

How to determine the melting point of a mixture, which is composed of substances having different-different melting points? Posted: 13 Jan 2019 01:51 AM PST submitted by /u/suyogya1 [link] [comments]

We know that introducing forests into dry/hot climates has the potential of changing local climates into something much more habitable. What would be the effect on local climate of artificial afforestation in barren but wet/cold places? Posted: 12 Jan 2019 07:59 AM PST I live in Scotland which is super barren as a result of human activity some few hundred years ago. I was wondering what, if any, effects on the local climate would have an extensive afforestation of the region? Making the place less windy would be probably one of the effects, but would it be also likely to alter the temperature much? What about precipitation? How extensive would the afforestation be for the effects to be measurable? submitted by /u/Sanuuu [link] [comments]

Why does this wrench with 50,000 amps current running through it appear to heat up from the edges inward? Posted: 12 Jan 2019 06:09 AM PST I would expect since roughly the same amount of electricity is flowing through the whole thing that it would heat more evenly. What's going on? ​ https://i.imgur.com/Um00Qdr.gifv submitted by /u/ILikeLeptons [link] [comments]

How is it possible to measures very high temperatures? Posted: 13 Jan 2019 03:18 AM PST I've just read an article about nuclear fusion reactors and the article said something about plasma temperatures of many million degree Celsius. How is it possible to measure these high temperatures? submitted by /u/SuperPenguin1701 [link] [comments]

What does an Atom actually look like? Posted: 12 Jan 2019 07:07 PM PST In school, were always taught that an atom looks like a bunch of electrons orbiting the nucleus in a circular motion. However, quantum mechanics tells a completely different story of probability. What does an atom actually look like? submitted by /u/secretspace2060 [link] [comments]

Is it possible for a star to have a low mass yet have a large volume? Posted: 12 Jan 2019 10:47 PM PST Similar to how neutron stars have a high mass and low volume, does the opposite exist? submitted by /u/Alphecho015 [link] [comments]

Do different gasses have different drag coefficients? Do they generate different amounts of resistance based on their molecular structure? Posted: 12 Jan 2019 08:48 AM PST submitted by /u/BrosephToDaMoon [link] [comments]

Occasionally we see plans to “bring back” extinct mammals like Mammoths, but in reality they would be Mammoth-Elephant hybrids. Would this method work with non-mammals like bringing back the Moa using other ratites like the Emu or Ostrich? Posted: 12 Jan 2019 04:47 AM PST As noted in the title often when talking about bringing back an extinct species it's usually in regards to a mammal that went extinct fairly recently due to (from my understanding) the fact species exist today that are closely related enough that it may be possible to produce a hybrid offspring. However I never see any talks about being back extinct birds or reptiles or other egg-laying creatures. Is there some biological reason why it would be harder to produce hybrids using egg-laying creatures. Is artificially inseminating egg-layers not a thing? Or is it simply a case of mammoths and Tasmanian tigers etc are easier "first steps" on the path to bringing back extinct animals? submitted by /u/---TheFierceDeity--- [link] [comments]

Why is the entropy of a continuous random variable not infinite? Posted: 12 Jan 2019 06:41 PM PST I understand entropy to be the "amount of randomness" involved in a random variable. In other words, the entropy of a random variable could be characterized as the number of bits of truly random information extractable from a variable. For example, if my variable is a coin flip, it makes sense that I would be able to extract one bit of entropy from that source. The Linux kernel makes use of this concept by "harvesting entropy" from various sources. But let's say I sampled from a uniformly distributed continuous random variable on the interval [0,1]. Could I not use the digits of such a random number as an infinite source of random bits? "Alright," you say, "you cannot truly sample from a continuous source." But even if we discritize this continuous random variable, allowing us to sample from it, we should always be able to get more random bits but simply slicing it more and more finely. Slicing it in half, gets 1 bit of entropy, slicing it into 128 sections gives 7 bits of entropy, etc. Can someone please help me understand? Thanks! submitted by /u/TubbyGb [link] [comments]

How do I calculate the force and collision time for an object which an impulse acts upon due to an inelastic collision? Posted: 12 Jan 2019 03:04 PM PST I've been trying to work out the mechanics for this all afternoon but I'm stuck. I can show you my notes if that would help. If I have two objects moving towards each other, and I know their masses, velocities and accelerations before impact and the coefficient of restitution between them, how do I calculate the force on each object as a result of the collision? Secondly, how do I calculate the length of time this force is applied for (collision time)? (Impulse = the force I need * the time I need) Thanks submitted by /u/DaCukiMonsta [link] [comments]

Why are photo files different sizes? Posted: 12 Jan 2019 06:19 PM PST Digital cameras have sensors that detect a certain number of megapixels. Why are some photo files larger than others if each photo was taken using the same sensor recording the same number of pixels? submitted by /u/Jglash1 [link] [comments]

How does temperature work in space? Posted: 12 Jan 2019 04:01 PM PST Im curious. Lets say a city sized rock is floating in space. Just an ordinary, mineral based rock. Not going anywhere really, just existing. What would its temperature be like, if lets say, it was the same distance from the sun, as earth is. Would its surface temperature hit 200C? What would its "core" temperature be like? ​ submitted by /u/Magyarharcos [link] [comments]

Deep-sea brine pools—how do they form, and do they make sounds? Posted: 12 Jan 2019 09:11 AM PST Hey everyone, I have a couple of questions about deep-sea brine pools (briefly described here, and also in Blue Planet II, episode 3). Why/How do these pools form? Specifically, why does the extra salt stay in the pool instead of being diluted by the surrounding ocean? If I were standing at the edge of such a pool (without dying, etc.) and threw a rock into the pool, would it make a sound? submitted by /u/Wonderful_Toes [link] [comments]

Can Radiation Kill on Contact or Cause Immediate Physical Damage? Posted: 12 Jan 2019 09:45 AM PST Hello, I am writing a science fiction story and looking for a believable weapons system for the characters to use. I'm looking into radiation as an option, as it has the ability to delete cell functions and kill cells. Everywhere I look either says it takes a minimum of a week to die from radiation exposure or that, and to quote an answer to a similar question on this subreddit, "if you run at a nuclear reactor core right after pulling it out, you'll die before touching it". So my question, in more detail is, if radiation could be shot from a gun in extremely high concentrations, could it damage the brain or heart enough to cause instant death, and could it damage the skin enough to cause visible physical trauma? What would this trauma look like? submitted by /u/ellieisherenow [link] [comments]

How do telescopes “hold still” during the long exposure times needed for images like the Hubble deep field photos? Posted: 12 Jan 2019 10:30 AM PST In long exposure photography, I know a camera must be held very still or be able to perfectly track the object to produce a clear image. Because Hubble is in orbit, how does it "hold still" for 11 day exposure times? Is it because the distance between Hubble and the area it's photographing is so great or is it compensated for by some computer wizardry? I've tried googling this, but I've never been able to find a reasonable answer. submitted by /u/Nerfo2 [link] [comments]

Why do we see from the front of our eyes if the retina is in the back? Why don’t we see the inside of our eyes? Posted: 12 Jan 2019 06:41 AM PST submitted by /u/prettymuchamine [link] [comments]

If two planes fly by one another in opposite directions, each going Mach 0.5, would there be a sonic boom? Or one that only the pilots could hear? Posted: 12 Jan 2019 07:57 AM PST From each pilot's point of view, the other plane is traveling at the speed of sound. So would this produce a sonic boom? And if not, are sonic booms only produced when an object is going Mach 1 relative to the Earth's surface? submitted by /u/otterman_empire [link] [comments]

Regarding statistics, of what significance is the mode? Are there any useful applications? Posted: 12 Jan 2019 11:09 AM PST submitted by /u/Ohm_eye_God [link] [comments]

If tick is attached to the host and put under water, can it take oxygen from host blood to stay alive? Posted: 12 Jan 2019 02:35 AM PST submitted by /u/Florox [link] [comments]

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