Askscience Megathread: Climate Change

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• Askscience Megathread: Climate Change
• What's the biological advantage of metamorphosis/pupating if the process is so energy-consuming (destroying the entire body in the pupa and rebuilding it again, rather than simply growing up) and vulnerable?
• Why can radio waves pass through solid objects?
• As of 2014, there were 10 people left in the world living in iron lungs. Do we not have the technology to remove them safely?
• Considering we have really big micro SD cards and normal sized memory cards, why does RAM memory in computers not go very high comparatively?
• Can we apply statistical mechanics / thermodynamics to a nucleus?
• Is there an end to the electromagnetic spectrum?
• Tensors in engineering mechanics: Can someone explain them to me in an intuitive, satisfying way?
• What causes certain eyes to become red in camera pictures ?
• What is the origin of all the different races we see of people in the world?
• How do astronauts live a normal life in space?
• What release more radiation, Fukishima and Chernobyl Vs every coal power plant ever?
• Does temperature have relativistic effects?
• Why is light reflected from the road polarized?
• What is Lie theory and its application in string theory/gravitational theories?
• How fast can data be transmitted using telegraph wires, with modern machines and transmission protocols?
• Why aren't humans constantly producing STEM cells? And what would the effects possibly be of creating a human who constantly produces STEM cells?
• How much energy total is radiated by all the stars and galaxies in the universe at any given moment?
• What causes plastic to appear to be moving when viewed through an infrared camera?
• What determines if your body will automatically 'revive' itself after various causes of death (drowning and coughing up the water afterwards, heart starting again randomly after other causes of death)?
• What is the 'evil eye' and how many cultures is this present in?

Askscience Megathread: Climate Change Posted: 01 Jun 2017 08:04 PM PDT With the current news of the US stepping away from the Paris Climate Agreement, AskScience is doing a mega thread so that all questions are in one spot. Rather than having 100 threads on the same topic, this allows our experts one place to go to answer questions. So feel free to ask your climate change questions here! Remember Panel members will be in and out throughout the day so please do not expect an immediate answer. submitted by /u/AskScienceModerator [link] [comments]

What's the biological advantage of metamorphosis/pupating if the process is so energy-consuming (destroying the entire body in the pupa and rebuilding it again, rather than simply growing up) and vulnerable? Posted: 01 Jun 2017 09:28 PM PDT Not to mention leaving the pupa immobile and completely vulnerable for long stretches of time. Why do almost all flying insects start as grubs, then mature to have wings, rather than just mature to have wings without pupating (like birds)? submitted by /u/BitLion [link] [comments]

Why can radio waves pass through solid objects? Posted: 02 Jun 2017 12:35 AM PDT submitted by /u/Tranquilsunrise [link] [comments]

As of 2014, there were 10 people left in the world living in iron lungs. Do we not have the technology to remove them safely? Posted: 01 Jun 2017 07:54 AM PDT I stumbled upon this news story, which talks about a man who has been living in an iron lung for the last 5 or 6 decades. I know the iron lung is an outdated and generally obsolete piece of medical equipment, so why can't we feasibly remove someone from it and simply hook them up to a normal positive pressure ventillator? Is it like the 'car-crash-victim-pinned-against-a-tree' kinda scenario wherein removing them would immediately kill them? Or is it just lack of money on their part? I have no medical knowledge so apologies if this a simple question submitted by /u/johnct [link] [comments]

Considering we have really big micro SD cards and normal sized memory cards, why does RAM memory in computers not go very high comparatively? Posted: 01 Jun 2017 10:04 PM PDT submitted by /u/into-thesky [link] [comments]

Can we apply statistical mechanics / thermodynamics to a nucleus? Posted: 02 Jun 2017 04:39 AM PDT If we have a large nucleus (>200 nucleons), then so long as there are no decays or incoming gammas or anything, it's an isolated box of particles with a fixed amount of energy. That means you can find the number of possible states based on the energy levels, and work out an entropy and a temperature. Is this a reasonable thing to do? I imagine you couldn't do it analytically, since the nuclear potential is all kinds of horrible, and there would be things to consider like spin. The nuclear force is short ranged, but the Coulomb force isn't, so protons would be a bigger headache than the neutrons. Also, 200 particles isn't very big compared to the size of the systems we usually talk about with thermodynamics, so maybe the usual approximations like Stirling wouldn't work so well. All that aside, are we able to do anything interesting by looking at the nucleus from a statistical point of view? If there's a temperature, how big is it? Does it say anything about nuclear collisions, or will they be in contact for too short a length of time for anything thermal to happen? Can we get phase transitions? submitted by /u/gatherinfer [link] [comments]

Is there an end to the electromagnetic spectrum? Posted: 02 Jun 2017 03:50 AM PDT If Gamma Rays are the highest "end" of the spectrum, (for frequency/energy) is there a limit to how much energy a GR photon can contain? Conversely, is there a limit to how little frequency and energy a radio wave photon can have? submitted by /u/Pixelated_ [link] [comments]

Tensors in engineering mechanics: Can someone explain them to me in an intuitive, satisfying way? Posted: 01 Jun 2017 04:00 PM PDT That's it. I give up. I've spent a few weeks scouring the internet for a an explanation of tensors in the context of engineering mechanics. You know, the ones every engineering student know and love (i.e. stress, strain, etc.). But alas, I cannot find any explanations of tensors without running into crazy abstract formalisms like "homomorphisms" and "inner product spaces". I'm not looking for an explanation of tensors using abstract algebra or infinitesimal, generalized vector spaces. I just want some clarification on what the heck they actually mean and are doing in the nice 3D, Euclidean space, especially in the context of mechanics. There are a few questions that have been bugging me that I'm hoping all you smart people here can answer: 1) What's the difference between a linear transformation and a tensor? Somehow they can both be represented by a 3x3 matrix, but they do different things when acting on a vector? Like the columns of a 3x3 matrix of a linear transformation tell you where the basis vectors end up, but the same columns of a tensor don't represent basis vectors at all? 2) Furthermore, a linear transformation transforms all of space but a tensor is defined at every point in space? Does a tensor act on vectors the same way as linear transformations do? 3) What the heck is the difference between a tensor product, dyadic product, and outer product and why are engineering tensors like the Cauchy stress built from the tensor product of two vectors (i.e. traction vector and basis vectors). 4) Is it true that scalars and vectors are just 0th order and 1st order tensors, respectively? How are all these things related to each other? I have plenty more questions, but I figure the answers to these could already be enough to fill a whole textbook. Just to note, I have already searched reddit for tensors but have't found any explanations that make any sense to me yet. Thanks! submitted by /u/RobbieFresh [link] [comments]

What causes certain eyes to become red in camera pictures ? Posted: 01 Jun 2017 08:35 PM PDT Why do some eyes produce the "red eye" effect? What's the physical mechanism in the cameras that creates this? submitted by /u/Maxterchief99 [link] [comments]

What is the origin of all the different races we see of people in the world? Posted: 01 Jun 2017 11:13 PM PDT This question came about when I was pondering Pangea, and wondering if, if the world were still a single continent with no natural borders (ie, the ocean), would there still be different races of people? Different languages? submitted by /u/BactaBobomb [link] [comments]

How do astronauts live a normal life in space? Posted: 01 Jun 2017 11:07 PM PDT Doing normal activities such as eating, exercising, going to the bathroom, showering, even washing clothes? submitted by /u/Baguette_in_your_fac [link] [comments]

What release more radiation, Fukishima and Chernobyl Vs every coal power plant ever? Posted: 01 Jun 2017 05:54 PM PDT This was prompted by something someone said at https://news.ycombinator.com/item?id=14462533 "I'm sure Chernobyl and Fukushima have released more radioactivity than every coal fired plant that has ever been or ever will be." Curious if that is likely to be true or not. submitted by /u/trprog [link] [comments]

Does temperature have relativistic effects? Posted: 01 Jun 2017 08:58 PM PDT If movement of an object can slow it's clock relative to an observer, is it possible to heat an object to the point that the molecular motion associated with the energy increase would have noticible relativistic effects? i.e. slowed clock or increased mass submitted by /u/hedesec [link] [comments]

Why is light reflected from the road polarized? Posted: 01 Jun 2017 11:23 PM PDT If the road is seen as a flat surface, shouldn't all light be reflected, and not only some preferred direction of polarization? And yes I though about this in relation to sunglasses. submitted by /u/tyskstil [link] [comments]

What is Lie theory and its application in string theory/gravitational theories? Posted: 02 Jun 2017 01:11 AM PDT submitted by /u/spk96 [link] [comments]

How fast can data be transmitted using telegraph wires, with modern machines and transmission protocols? Posted: 02 Jun 2017 04:28 AM PDT submitted by /u/kpjoshi [link] [comments]

Why aren't humans constantly producing STEM cells? And what would the effects possibly be of creating a human who constantly produces STEM cells? Posted: 01 Jun 2017 10:13 PM PDT submitted by /u/DeadFoxTails [link] [comments]

How much energy total is radiated by all the stars and galaxies in the universe at any given moment? Posted: 01 Jun 2017 11:21 PM PDT I ask because this Atlantic article (https://www.theatlantic.com/science/archive/2017/06/gravitational-waves-black-holes/528807/?utm_source=atlfb) states "[t]he collision of two black holes releases more energy than all the stars and galaxies in the universe radiate at any time." This seems like a stretch to me. The collision they reference released the energy of three solar masses, mass-energy equivalence predicts 5.36E47 joules. I realize this is an almost unimaginable number, but has the finitude of the universe even been established? What's the current thinking about this? Secondly, the article quotes a few astronomers expressing surprise that they found so many large black holes, ranging from 20-60 solar masses. Are the supermassive black holes thought to be in the center of galaxies, ranging in the thousands to billions of solar masses, just in another category altogether? I don't get the surprise. submitted by /u/hotsauce1987 [link] [comments]

What causes plastic to appear to be moving when viewed through an infrared camera? Posted: 01 Jun 2017 10:40 PM PDT When looking through my indoor infrared security camera, a piece of hard black plastic (part of a stereo) appears to be moving/growing. Little organic rounded blobs come out and then back in to the plastic. What causes this phenomenon? submitted by /u/throwcorner [link] [comments]

What determines if your body will automatically 'revive' itself after various causes of death (drowning and coughing up the water afterwards, heart starting again randomly after other causes of death)? Posted: 01 Jun 2017 09:53 PM PDT TLDR: Generally curious about what is happening when people appear to be dead and randomly start breathing again(I focus on drowning as an obvious example but interested in other causes of death as well). Are the drowning victims that cough up the water on land without CPR not actually dead yet? Is it possible for their heart to be completely stopped and have themselves recover when they reach the surface without any aid? What about when people 'die' but then their heart re-starts on it's own and they end up being alive, without any external stimulus (i.e: defibrillation). What causes of death have this associated with it generally? (I would assume heart-attack victims have the potential for their heart to re-start after it has stopped without any aid) If your heart is stopped and you are dead, does your body react to any natural stimulus that can re-start your heart? For example will your body know that you are now on the surface and can breath again after drowning and your heart having completely stopped? How many minutes does this effect last if so? submitted by /u/Sol515 [link] [comments]

What is the 'evil eye' and how many cultures is this present in? Posted: 01 Jun 2017 09:24 PM PDT I've heard of the 'evil eye' in Greek, Italian, Indian, and Roma culture, I'm wondering if this concept is present in other cultures as well. And what exactly is it? submitted by /u/ignorethisnamepleaae [link] [comments]

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How do i calculate probability of a probability distribution?

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• How do i calculate probability of a probability distribution?
• By observing a radioactive atom, is there any way of knowing whether it will decay soon or in a million years' time?
• Is there something to addition like what addition is to multiplication?
• Have we ever monitored the brain of a dying individual and if so were there any interesting phenomenon observed?
• What's the consensus on the executive function model of ADHD?
• How pausible would it be for planes/jets to operate on solar energy?
• How do I calculate the probability of a frequency distribution
• What is actually happening when I see a 'shooting star'?
• Overheard that it is possible to represent more than 2^n states using n bits. How?
• How can a spectrometer split the light into its components?
• Why are power outlets in the US typically in groups of 2?
• Why do we wake up from sleeping after certain amount of time?
• If diamonds are found in and around lava tubes, why do we not find them around Hawaii or other volcanic islands?
• Is a tube more conductive than a solid wire?
• What is the origin of the anti-A & anti-B antibodies in Type O plasma?
• What is the law for the amount of momentum transferred in a collision of two elementary particles ?
• How does private key encryption work?
• Why do air bubbles "wobbles" as they rise?
• If selective breeding can allow us to work towards desirable traits in organisms, would it be possible to change the likelihood of an organism's sex?
• What happens to a phagocyte after phagocytosis?

How do i calculate probability of a probability distribution? Posted: 01 Jun 2017 02:59 AM PDT Dear people. Hear me out. I have histogram of the probability of certain values x of a random experiment. Its looks very nicely like a normal distribution. Then I have the data of an experiment that I did that tells how many times I measured value x. I would like to find out how likely it is to find that specific value distribution of given the probability distribution that I have but I can't figure out how to calculate this. in other words, I would like to figure out how likely it is that my measured distribution is random or ordered. In analogy, I thow a dice 1000 times and I get the distribution of results. I want to figure out how likely it is that this distribution of numbers happened by random chance or not. Can you help me out? submitted by /u/TunnelFET [link] [comments]

By observing a radioactive atom, is there any way of knowing whether it will decay soon or in a million years' time? Posted: 01 Jun 2017 04:35 AM PDT Is radioactive decay truly random? And do radioactive atoms show signs that they are about to decay before they do so? submitted by /u/xkimlam [link] [comments]

Is there something to addition like what addition is to multiplication? Posted: 31 May 2017 11:27 PM PDT So multiplication is repeated addition 2*3=2+2+2. we know we can go further with Exponentiation being rpeated multiplication 23 = [;2\uparrow3;] = 2*2*2 and we can keep going like that [;2\uparrow\uparrow3;] = 32 = 222 [;2\uparrow\uparrow\uparrow3;] = [;2\uparrow\uparrow2\uparrow\uparrow2;] = [;2\uparrow\uparrow4;]=2222 etc. but can we go into the other direction? like 2+3 = [;2\downarrow2\downarrow2;] and [;2\downarrow3;] = [;2\downarrow\downarrow2\downarrow\downarrow2;] submitted by /u/TheWhiteWarrior [link] [comments]

Have we ever monitored the brain of a dying individual and if so were there any interesting phenomenon observed? Posted: 31 May 2017 10:32 AM PDT submitted by /u/STR-6055 [link] [comments]

What's the consensus on the executive function model of ADHD? Posted: 01 Jun 2017 07:59 AM PDT I'm an adult who was diagnosed with ADHD as a child (called ADD at the time). Thanks to the video that was on the front page a few days ago, I was recently introduced to the work of Dr. Russell Barkley. Much of what he said about ADHD being primarily an impairment of executive function sounded like it made a lot of sense, and it matched up very well with my own experience of my disability. Is this a well established theory of the cause and nature of ADHD? Is it well supported by the work of other researchers, or is Dr. Barkley on the fringe? If it goes against the consensus, then what is the consensus? Or what are competing theories? Here's a video that summarizes his ideas. submitted by /u/TalksInMaths [link] [comments]

How pausible would it be for planes/jets to operate on solar energy? Posted: 31 May 2017 11:14 PM PDT submitted by /u/crisx101 [link] [comments]

How do I calculate the probability of a frequency distribution Posted: 01 Jun 2017 03:09 AM PDT Dear people. I did an experiment that results in a frequency for a set of stochastic variables x. I also did a computation that predicts the distribution of the variable x given random chance (the probability distribution of x given randomness). Now I would like to know how likely it is that my experiment x is just random. Similar to throwing a dice 1000 times, counting the occurence of each eye and then calculating how likely it is that this dice is fair or that it is unfair. How does one do this? submitted by /u/TunnelFET [link] [comments]

What is actually happening when I see a 'shooting star'? Posted: 31 May 2017 06:19 PM PDT submitted by /u/dynomite4444 [link] [comments]

Overheard that it is possible to represent more than 2^n states using n bits. How? Posted: 01 Jun 2017 07:42 AM PDT submitted by /u/Dirkdirichlet [link] [comments]

How can a spectrometer split the light into its components? Posted: 31 May 2017 05:20 PM PDT I understand that faraway planets' atmospheres can be analysed because light refracts differently based on what the light is passing through, but I don't know how a spectrometer can determine how many and what kinds of light(-components) make up the light we receive down here. submitted by /u/Frieso [link] [comments]

Why are power outlets in the US typically in groups of 2? Posted: 31 May 2017 01:45 PM PDT submitted by /u/Rageflapjack [link] [comments]

Why do we wake up from sleeping after certain amount of time? Posted: 31 May 2017 09:27 AM PDT submitted by /u/Aar0n_F [link] [comments]

If diamonds are found in and around lava tubes, why do we not find them around Hawaii or other volcanic islands? Posted: 31 May 2017 02:54 PM PDT It seems to be similar in my simple mind. submitted by /u/DC74 [link] [comments]

Is a tube more conductive than a solid wire? Posted: 31 May 2017 11:02 AM PDT To be more specific, does the greater surface area of a tube allow a greater flow of electrons than a wire with an equivalent outer diameter? If there is a difference, what is it and what are the applications? Edit: As pointed out by /u/undercoveryankee, the phrase "equivalent outer diameter" is potentially ambiguous. The intended expression was "same diameter". Ex: a pipe with 1mm OD compared to a solid wire with 1mm OD. submitted by /u/daerogami [link] [comments]

What is the origin of the anti-A & anti-B antibodies in Type O plasma? Posted: 31 May 2017 11:27 AM PDT A blood question that deserves a bloody answer! (Heh. Pun intended. Frustration also intended.) I have a BS in biology and was in a discussion with my coworker. I have type O+ blood and so does he. We're wondering if people like us with Type O blood are born with the anti-A and anti-B antibodies in our plasma or if we would have to be exposed to type A/B/AB in order to get these antibodies? Please support with reliable source if possible. submitted by /u/ellie_love1292 [link] [comments]

What is the law for the amount of momentum transferred in a collision of two elementary particles ? Posted: 31 May 2017 01:58 PM PDT Is there a law for the probability of transferring some amount of momentum between two ( lets say ) electrons, given some initial conditions ? Do they simply switch momenta or ( what i think ) is it random, depending on e.g. the angle ? What is the law ? submitted by /u/Coousey [link] [comments]

How does private key encryption work? Posted: 31 May 2017 01:39 PM PDT I understand the basic idea that you encrypt using your private key and their public key and they can decrypt using their private key and your public key, but if your public key is the inverse of your private key, how does your private key stay secret? can't people figure it out by just finding the inverse of your public key? submitted by /u/waltzingwizard [link] [comments]

Why do air bubbles "wobbles" as they rise? Posted: 31 May 2017 09:26 PM PDT Why dont they rise straight up? submitted by /u/ehbuster [link] [comments]

If selective breeding can allow us to work towards desirable traits in organisms, would it be possible to change the likelihood of an organism's sex? Posted: 31 May 2017 10:38 AM PDT submitted by /u/isaacbee1 [link] [comments]

What happens to a phagocyte after phagocytosis? Posted: 31 May 2017 10:55 AM PDT submitted by /u/meeturself [link] [comments]

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Where do Newtonian physics stop and Einsteins' physics start? Why are they not unified?

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• Where do Newtonian physics stop and Einsteins' physics start? Why are they not unified?
• Has the introduction of emojis into Western language structures made our minds more capable of learning Eastern pictorial languages?
• Why can't we just inject a ton of power into a phone at once to instantly charge it? Is that just too dangerous, or just not possible?
• Why is it so hard to shoot ICBM's out of the sky?
• Does the nuclear testing make a significant contribution to the normal amounts of radiation we receive daily?
• How did scientists measure the radius of atoms and other stuffs?
• How do electronics keep track of time when they are turned off/ out of battery?
• I don't know if this is the right question for this subreddit, but how would a pack of raptors, let's say deinonychus, fair in the modern day Savannah/Serengeti?
• Why do polarised sunglasses make some screens difficult to read?
• What does 'error variance' mean in this chart?
• Can pions (or other mesons) form a "nucleus" by binding to other pions via the strong force?
• Would syringe hold liquid in vacuum?
• How are seedless watermelon grown if they are seedless?
• If I point randomly into the sky, how likely is it that I'm pointing at a star?
• What is used to date old stone tablets?
• Are there currently any known uses or benefits to inducing radioactivity in normally non-radioactive substances?
• What are cosmic rays, and what are some ways that astronauts would be able to protect themselves if they were exposed to them?
• What happens to the parts of the brain which control amputated body parts?
• How would relativity affect the "length" of speed of light data transfer like a radio transmission?
• If electricity can be turned into heat and photons with a light bulb, can photons be turned back into electricity?
• How Does Auto-Shut Off Engine Design Not Destroy Engines?
• Why does the current decrease when the voltage increases in the National Grid?
• Does lepton number have to be conserved in nuclear decay?

Where do Newtonian physics stop and Einsteins' physics start? Why are they not unified? Posted: 30 May 2017 05:42 PM PDT submitted by /u/Jange_ [link] [comments]

Has the introduction of emojis into Western language structures made our minds more capable of learning Eastern pictorial languages? Posted: 30 May 2017 06:44 PM PDT submitted by /u/gizzytausend [link] [comments]

Why can't we just inject a ton of power into a phone at once to instantly charge it? Is that just too dangerous, or just not possible? Posted: 31 May 2017 07:38 AM PDT submitted by /u/willgetzen [link] [comments]

Why is it so hard to shoot ICBM's out of the sky? Posted: 30 May 2017 04:21 PM PDT We have been working on this since the 80s. It seems like an impossible feat for that era of technology; However, in the last 18 years we have only hit 10 of 18 targets in testing. It is an awful long time between tests, and the results still vary. submitted by /u/resinis [link] [comments]

Does the nuclear testing make a significant contribution to the normal amounts of radiation we receive daily? Posted: 30 May 2017 07:37 PM PDT It has contributed in some areas such as Trinity and such, but has it made an impact on where most of civilization lives? Globally? submitted by /u/sbundlab [link] [comments]

How did scientists measure the radius of atoms and other stuffs? Posted: 31 May 2017 05:58 AM PDT They can seem to measure very accurate things at 10 decimal places. How do they do it? submitted by /u/AeolDrias [link] [comments]

How do electronics keep track of time when they are turned off/ out of battery? Posted: 30 May 2017 06:07 PM PDT My iPod died a few months ago and was completely without power until a few days ago when I plugged it in. When it opened it was down to the second. It also wasn't connected to wifi. How does it keep track? submitted by /u/JBman2001 [link] [comments]

I don't know if this is the right question for this subreddit, but how would a pack of raptors, let's say deinonychus, fair in the modern day Savannah/Serengeti? Posted: 31 May 2017 02:18 AM PDT Would they be able to compete with other predators like lions, hyenas, and crocodiles, or would they die out? (Assuming they can adapt to the environment) I know dinosaurs are supposed to be on average a lot larger and stronger than modern day animals, but I thought it was interesting the raptor called deinonychus only weighed 150 pounds (compared to a female lion which weights 280) was able to hunt other dinosaurs such as tenontosaurus which weighed around 2000 pounds (compared to zebras and water buffaloes which weigh around 1000 pounds). Would these dinosaurs dominate the food chain today? Or were they only specialized for the animals of their time and fail at hunting the herbivores of the savannah/Serengeti. submitted by /u/Bosombuddies [link] [comments]

Why do polarised sunglasses make some screens difficult to read? Posted: 30 May 2017 03:21 PM PDT I'm a crane driver and find it hard to look at my instrument screens when wearing my polarised sunnies. It's difficult having to choose between reading my vitals and avoiding sun strike. submitted by /u/Gopshop [link] [comments]

What does 'error variance' mean in this chart? Posted: 31 May 2017 02:59 AM PDT This is the chart in question. It's the results of a psychological study measuring the characteristics of mystical experiences. There are three groups of items: introvertive/extrovertive/interpretative, and I'm struggling to make sense of the numbers and what the implication is. submitted by /u/Euthalius [link] [comments]

Can pions (or other mesons) form a "nucleus" by binding to other pions via the strong force? Posted: 30 May 2017 07:19 PM PDT For example, a π+ and π0 acting as the meson equivalent of the proton and neutron. Can this not happen because the π0 decays too quickly, or is there another reason? Also, if these meson "nuclei" can occur, are they potentially more stable than the constituent mesons (like neutrons become stable when bound in a nucleus)? submitted by /u/USI-9080 [link] [comments]

Would syringe hold liquid in vacuum? Posted: 30 May 2017 05:27 PM PDT As the tilte reads. I think it should, because it does hold water and it does not care about the atmospheric pressure. But also, shouldn't the liquid vaporize? What if syringe would hold liquid with much higher/lower density in medium which has much lower/higher density than the liquid inside the syringe? Would the liquid also hold? submitted by /u/paulysch [link] [comments]

How are seedless watermelon grown if they are seedless? Posted: 30 May 2017 03:42 PM PDT submitted by /u/Revake [link] [comments]

If I point randomly into the sky, how likely is it that I'm pointing at a star? Posted: 30 May 2017 03:52 PM PDT Edit: phrased differently, If I extend a line from the tip of my finger to the edge of the observable universe, what's the probability that that line intersects with the body of a star? This was inspired by reading about Olber's Paradox or the "dark night sky paradox". submitted by /u/hexachoron [link] [comments]

What is used to date old stone tablets? Posted: 30 May 2017 11:01 PM PDT I was curious and tried to find the oldest known piece of writing and in seeing all the stone tablets I was wondering how their age is determined. With old papyrus or parchment they can use radiocarbon dating to find out when the paper was made to have a rough idea. I know rocks can be dated using different radioactive dating and magnetic dating techniques but that just tells you when the stone was made not when the story was written. Even if you date the layer they are in wouldn't that just tell you when that rock was created? submitted by /u/MelodicBenzedrine [link] [comments]

Are there currently any known uses or benefits to inducing radioactivity in normally non-radioactive substances? Posted: 30 May 2017 04:54 PM PDT submitted by /u/Cbreezy517 [link] [comments]

What are cosmic rays, and what are some ways that astronauts would be able to protect themselves if they were exposed to them? Posted: 30 May 2017 05:32 PM PDT Where do cosmic rays come from in large quantities? I know that some of them come from the sun, but where else? And, hypothetically, say that a team of astronauts on a space shuttle happened to venture into an area with a lot of cosmic rays. How would they protect themselves, if they even could? If they couldn't, what would be the effect? submitted by /u/Xilc [link] [comments]

What happens to the parts of the brain which control amputated body parts? Posted: 30 May 2017 04:00 PM PDT submitted by /u/bradysites [link] [comments]

How would relativity affect the "length" of speed of light data transfer like a radio transmission? Posted: 30 May 2017 04:39 PM PDT Let's say that I was to send a 10 second long Radio Transmission from an object going 0.9 the speed of light relative to another receiver. Would that receiver get a "sped up" and compressed radio transmission? submitted by /u/Karnman [link] [comments]

If electricity can be turned into heat and photons with a light bulb, can photons be turned back into electricity? Posted: 31 May 2017 03:50 AM PDT submitted by /u/bucketmanism [link] [comments]

How Does Auto-Shut Off Engine Design Not Destroy Engines? Posted: 30 May 2017 09:30 AM PDT I rent cars quite a bit for work and over the last six months I have gotten a handful that have a feature where they basically shut off when the car stops and then start back up when the car tries to move. I've been told starting up the engine is one of the harshest things an engine goes through, yet this approach to design seems to unnecessarily add a ton of off/on cycles to a drive. Is the notion / assumption that start up is the harshest out of date or are special precautions taken to mitigate the damage of this particular feature? submitted by /u/dza76wutang [link] [comments]

Why does the current decrease when the voltage increases in the National Grid? Posted: 31 May 2017 03:27 AM PDT In school I learned that in circuits that voltage and current are proportional to each other; when one increases the other does aswell. In the National Grid however, the opposite seems to happen. Is it something to do with the transformers or that it's an alternating current? Thanks! submitted by /u/Nafiblu [link] [comments]

Does lepton number have to be conserved in nuclear decay? Posted: 31 May 2017 03:21 AM PDT I was looking at examples of radioactive decay earlier, and I noticed something strange. In an alpha emittance example, it gave Uranium-238 decaying to Thorium-234 via the emittance of an Alpha particle and a neutrino. Why would a neutrino be produced here? As far as I'm aware, conservation rules apply to all decays don't they? There are no leptons on the Uranium side, so all it does is offset the balance. submitted by /u/TRPAlternative [link] [comments]

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