Why does it take a million years for a photon moving at the speed of light to reach the sun's surface from its core?

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• Why does it take a million years for a photon moving at the speed of light to reach the sun's surface from its core?
• What makes nuclear fusion as an energy source difficult to produce?
• [astronomy] If the universe expanded at the same rate during the Big Bang why are there areas of high mass density( galaxies) and areas of low mass densities?
• How does the process of turning protons + electrons into neutrons happen?
• If two video projectors play a movie in adjacent walls and their image beams cross each other, would there be any measurable degradation to the quality of the images?
• Can a black hole lose enough mass to be visible?
• How are we able see the laser in darkness if all the photons are moving in one direction?
• Does Arrow's impossibility theorem make discussion about the recent elections popular vote a waste of time?
• What/how quantum mechanically would one constitute a stable atom/element from an unstable one? I.e how does one determine that neutrons, protons and electrons are stable?
• Why does small-angle approximation work the way it does in Physics?
• Why are there no high refractive index materials in the visible region?
• Why is routine bloodwork not recommended for children?
• How can we tell if light has been red-shifted?
• What ever happened to graphene?
• What is the fundamental difference between a space dimension and a time dimension?
• Is there any connection between red clay soil types and gold veins?
• Before it became associated with the period of a 133 Caesium atom, what was the consensus as to how long a second was?
• Are molecular orbital theory and hybridization compatible?
• Are there stars that are powered by fission?
• When I shower in the winter, a fan pulls the warm air out of the room while a vent pushes warm air into the room. Does this make the room warmer by venting heat in or colder because of Bernoulli's principle?

Why does it take a million years for a photon moving at the speed of light to reach the sun's surface from its core? Posted: 25 Jan 2017 05:00 PM PST Bonus question...how much of the light reaching earth is million year old light vs. Light that was created close to the surface and is more like 5 minutes old? submitted by /u/podank99 [link] [comments]

What makes nuclear fusion as an energy source difficult to produce? Posted: 25 Jan 2017 04:51 PM PST I've read a lot about it and I'm studying mechanical engineering, so I understand the concept generally. But I'm curious/having trouble understanding the constraints on our ability to produce this kind of power. submitted by /u/AHighFifth [link] [comments]

[astronomy] If the universe expanded at the same rate during the Big Bang why are there areas of high mass density( galaxies) and areas of low mass densities? Posted: 26 Jan 2017 04:05 AM PST submitted by /u/Big_Throbbing_Bunny [link] [comments]

How does the process of turning protons + electrons into neutrons happen? Posted: 26 Jan 2017 05:57 AM PST I'm in first year of high school physics and am currently doing a poster on the life cycle of stars. I was reading a bit in-depth about how the pressures inside neutron stars are so immense that the electrons are "pushed" into the protons, thus creating neutrons. What I don't understand is how this happens? As far as I know a proton consists of 2 up quarks and 1 down quark, and a neutron consists of 1 up quark and 2 down quarks. Wouldn't this proton+electron interaction mean that the proton would need to transform one of it's up quarks into a down quark? How can something like this just happen? Also, wouldn't you need more than just a proton + electron to make a neutron? When a lone neutron undergoes beta decay it becomes a proton but also releases an electron AND an electron antineutrino. If that is the product of beta decay, why do you not need an antineutrino to turn protons and electrons into neutrons. Sorry if this set of questions is not clear I tried to make it as understandable as possible! *EDIT: Fixed one spelling mistake submitted by /u/TrioXideCS [link] [comments]

If two video projectors play a movie in adjacent walls and their image beams cross each other, would there be any measurable degradation to the quality of the images? Posted: 25 Jan 2017 12:59 PM PST submitted by /u/wonderifthisistaken [link] [comments]

Can a black hole lose enough mass to be visible? Posted: 26 Jan 2017 12:54 AM PST Considering the effects of Hawking radiation, it is known that black holes slowly lose mass as they take in negative energy from nearby virtual particles and it is possible that they will eventually evaporate completely given enough time. Would it be possible, at least in principle, for a black hole to lose enough mass that it could no longer sustain an event horizon? Or does it happen that they are simply too dense? Would it depend on other factors, such as whether or not there is a true singularity at the centre, or an ultra dense arrangement of matter contained in a finite volume of space? How does our current understanding of physics explain this? I'm very interested in all your answers and please correct me if my understanding abut any of the above is wrong / incomplete. Thank you. submitted by /u/Afrotom [link] [comments]

How are we able see the laser in darkness if all the photons are moving in one direction? Posted: 25 Jan 2017 09:51 PM PST Obviously in the above scenario laser is pointed in direction other than towards our face... submitted by /u/troninron [link] [comments]

Does Arrow's impossibility theorem make discussion about the recent elections popular vote a waste of time? Posted: 25 Jan 2017 10:06 PM PST I hope it is even possible to ask a question like this here given the political nature of it. I always thought (perhaps mistakenly) that due to Arrow's impossibility theorem, because we cannot satisfy all the fairness criterion that the majority of these arguments about the popular vote or the electorial college are largely a waste of time because whether we used that system or not, there would still be a hole (from a game theoretic perspective?). Having said that, I have never read any commentary regarding the US election in my adult life that has ever made mention of this result. Am I misunderstanding the theorem? Does it not apply in this circumstance? submitted by /u/jt_lau [link] [comments]

What/how quantum mechanically would one constitute a stable atom/element from an unstable one? I.e how does one determine that neutrons, protons and electrons are stable? Posted: 25 Jan 2017 08:44 PM PST submitted by /u/phrresehelp [link] [comments]

Why does small-angle approximation work the way it does in Physics? Posted: 26 Jan 2017 05:18 AM PST submitted by /u/moduhls [link] [comments]

Why are there no high refractive index materials in the visible region? Posted: 26 Jan 2017 04:11 AM PST It seems like the range of refractive indices in the visible region is very restricted. In infrared we have lots of materials like silicon, GaAs and tellurium. And in ultraviolet most refractive indices go up drastically, although not as much as the low bandgap semiconductors. In the visible range, the highest n I know of in a useful material is 2.4 in diamond. Why is that? submitted by /u/Wiz_Kalita [link] [comments]

Why is routine bloodwork not recommended for children? Posted: 25 Jan 2017 07:18 PM PST Why do we not perform or recommend yearly bloodwork screenings in children as we do in adults? Is it simply because being children they are less at risk? submitted by /u/LadyAithne [link] [comments]

How can we tell if light has been red-shifted? Posted: 25 Jan 2017 08:06 PM PST submitted by /u/Red__Burrito [link] [comments]

What ever happened to graphene? Posted: 25 Jan 2017 05:47 PM PST I remember reading up about it a while ago, the amazing miracle substance. The articles I looked at couldn't shut up about how amazing this stuff is and how it will basically improve everything. I did a little more research today and learned it was invented back in 2004, is it normal for the indoctrination of new materials to take this long? I know that apparently no one really knows how to mass produce it at a reasonable cost, I'm just wondering why it seems like very little progress is being made and how much longer till we start seeing graphene show up in more and more products. submitted by /u/Giant_Bearded_Face [link] [comments]

What is the fundamental difference between a space dimension and a time dimension? Posted: 26 Jan 2017 03:23 AM PST Referring to this SMBC comic. Why would multiple time dimensions make travelling through space easier? http://www.smbc-comics.com/comic/the-dimension-store submitted by /u/M4rkusD [link] [comments]

Is there any connection between red clay soil types and gold veins? Posted: 25 Jan 2017 08:48 PM PST Recently on /r/AskanAmerican, a Georgian commented that there's a lot of red clay out in Georgia. I grew up in the Gold Country of California. There's a lot of red clay out here too. America's first gold rush was in Georgia and its most famous was here in California. Is there some connection between red clay and gold veins? submitted by /u/RsonW [link] [comments]

Before it became associated with the period of a 133 Caesium atom, what was the consensus as to how long a second was? Posted: 25 Jan 2017 03:17 PM PST submitted by /u/Velteau [link] [comments]

Are molecular orbital theory and hybridization compatible? Posted: 25 Jan 2017 04:59 PM PST We learned about hybridization (sp, sp2, etc) in class and later we learned about molecular orbital theory. They seemed to give different shaped orbitals so I am a bit confused on if they are competing theories, if they are different sides of the same coin, or if I am misunderstanding. I would really appreciate some help, thank you reddit. submitted by /u/thebakedpenguin [link] [comments]

Are there stars that are powered by fission? Posted: 25 Jan 2017 10:41 PM PST I know that stars are fueled by nuclear fussion. But are there any stars that are powered by fission. And if not is it even possible by our current understanding of physics? submitted by /u/slayeropolis [link] [comments]

When I shower in the winter, a fan pulls the warm air out of the room while a vent pushes warm air into the room. Does this make the room warmer by venting heat in or colder because of Bernoulli's principle? Posted: 25 Jan 2017 06:53 PM PST submitted by /u/BecauseEricHasOne [link] [comments]

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Can new pimples and zits form on the body/face of someone after they have been declared clinically dead?

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• Can new pimples and zits form on the body/face of someone after they have been declared clinically dead?
• Do neutrons bound to stable atoms decay the same way protons do over long timescales?
• Does tongue surface area affect taste sensitivity?
• If the Earth was shrunken down to the size of a marble but still had the same mass, would it form a black hole? How much mass would a marble need to have to form a black hole?
• Why don't waterfalls get worn down to gradual inclines?
• Could I make the case that any sequence of numbers i choose at random, no matter how long, like 53948714, can be found somewhere along the digits of pi?
• If the Planck Length is the smallest possible measurement of length, then is it also the shorted distance that can be traveled?
• Why does running on an inclined treadmill feel like running up a hill (needs more energy) even though you're not gaining elevation (potential energy)?
• Ask Anything Wednesday - Biology, Chemistry, Neuroscience, Medicine, Psychology
• What is the Pauli Exclusion Principle?
• What restricts temperatures from going above Planck's temperature(1.416785×10^32K)?
• If a proton consists of numerous quark/antiquark pairs and gluons, why is its mass only 80x larger than the net 2 up quarks and 1 down quark?
• With MRI Magnets being ridiculously strong, Why don't they affect compasses, systems, animals, etc ?
• If forces are mediated by particles, how does a mass deficit arise in bound systems?
• Expansion velocity of a nuclear fireball?
• Why are electromagnetic waves represented by their frequency?
• What are the arguments for and against Chronic Fatigue?
• How do they make sure when building a tall skyscraper, it remains straight ?
• When free falling, is it better to hold on to something or not?
• Why is Homo Florensiensis considered a new species of humans?

Can new pimples and zits form on the body/face of someone after they have been declared clinically dead? Posted: 24 Jan 2017 10:08 PM PST Random shower thought. I'm actually curious, since the bacteria and white blood cells on and in your body wouldn't die out immediately after death. submitted by /u/macabreswindler [link] [comments]

Do neutrons bound to stable atoms decay the same way protons do over long timescales? Posted: 25 Jan 2017 02:17 AM PST As in do the protons in an atom have to decay first untill the atom becomes an unstable isotope, making the neutrons decay into protons, and then the newly formed protons decay again. Or can neutrons decay into elementary particles directly in a similar way protons can? I know that the existance of proton decay is not confirmed, and some scientist may even say its unlikely. But does the hypothesis also include bound neutron decay? submitted by /u/empire314 [link] [comments]

Does tongue surface area affect taste sensitivity? Posted: 24 Jan 2017 10:04 PM PST Edit: To clarify, if it's not obvious, my intuition here is that greater tongue surface area translates to more taste buds, which means greater taste sensitivity. Reasons this might be wrong: Tongue surface area may not actually be correlated with number of taste buds. Maybe they're just less densely spaced. Number of taste buds may not translate to greater taste sensitivity. Maybe with more taste buds, the brain is less sensitive to input from any one taste bud. The way I imagine one might test this hypothesis is by seeing whether ability to detect sugar, acid, salt, or some bitter compound dissolved in water at low concentrations is correlated with tongue surface area. I was unable to find any such research, though. submitted by /u/brberg [link] [comments]

If the Earth was shrunken down to the size of a marble but still had the same mass, would it form a black hole? How much mass would a marble need to have to form a black hole? Posted: 25 Jan 2017 05:35 AM PST submitted by /u/suckit5253 [link] [comments]

Why don't waterfalls get worn down to gradual inclines? Posted: 24 Jan 2017 07:59 AM PST submitted by /u/En_lighten [link] [comments]

Could I make the case that any sequence of numbers i choose at random, no matter how long, like 53948714, can be found somewhere along the digits of pi? Posted: 25 Jan 2017 02:57 AM PST submitted by /u/Zoidbrg [link] [comments]

If the Planck Length is the smallest possible measurement of length, then is it also the shorted distance that can be traveled? Posted: 24 Jan 2017 06:58 PM PST Of course, assuming one could control movement to such a minute increment. submitted by /u/Running-Fox [link] [comments]

Why does running on an inclined treadmill feel like running up a hill (needs more energy) even though you're not gaining elevation (potential energy)? Posted: 24 Jan 2017 07:26 PM PST If you run up a hill, you have to work harder and that work (energy) is transferred into potential energy because at the end you are higher in elevation then when you began. Running on an inclined treadmill feels like running up hill, and seems to require the same increase in energy but without the extra potential energy at the end. Where does that extra energy go? submitted by /u/uscmissinglink [link] [comments]

Ask Anything Wednesday - Biology, Chemistry, Neuroscience, Medicine, Psychology Posted: 25 Jan 2017 07:04 AM PST Welcome to our weekly feature, Ask Anything Wednesday - this week we are focusing on Biology, Chemistry, Neuroscience, Medicine, Psychology Do you have a question within these topics you weren't sure was worth submitting? Is something a bit too speculative for a typical /r/AskScience post? No question is too big or small for AAW. In this thread you can ask any science-related question! Things like: "What would happen if...", "How will the future...", "If all the rules for 'X' were different...", "Why does my...". Asking Questions: Please post your question as a top-level response to this, and our team of panellists will be here to answer and discuss your questions. The other topic areas will appear in future Ask Anything Wednesdays, so if you have other questions not covered by this weeks theme please either hold on to it until those topics come around, or go and post over in our sister subreddit /r/AskScienceDiscussion , where every day is Ask Anything Wednesday! Off-theme questions in this post will be removed to try and keep the thread a manageable size for both our readers and panellists. Answering Questions: Please only answer a posted question if you are an expert in the field. The full guidelines for posting responses in AskScience can be found here. In short, this is a moderated subreddit, and responses which do not meet our quality guidelines will be removed. Remember, peer reviewed sources are always appreciated, and anecdotes are absolutely not appropriate. In general if your answer begins with 'I think', or 'I've heard', then it's not suitable for /r/AskScience. If you would like to become a member of the AskScience panel, please refer to the information provided here. Past AskAnythingWednesday posts can be found here. Ask away! submitted by /u/AutoModerator [link] [comments]

What is the Pauli Exclusion Principle? Posted: 25 Jan 2017 05:15 AM PST I don't know a whole lot about quantum mechanics, and I know the main example is electrons and their position and interaction between other electrons. But a more detailed explanation would be greatly appreciated. submitted by /u/cleverpenguin10 [link] [comments]

What restricts temperatures from going above Planck's temperature(1.416785×10^32K)? Posted: 24 Jan 2017 07:52 PM PST 1)I was reading about 'absolute hot' on the wiki and do not understand why "particle energies become so large that gravitational forces between them would become as strong as other fundamental forces" would prevent higher temperatures than planck's temperature. 2)Based on the wiki, the universe experienced this temperature 10-42 seconds post-bigbang, doesn't this indicate that the time before then would have higher temperatures than planck's temperature? submitted by /u/lightningblaze [link] [comments]

If a proton consists of numerous quark/antiquark pairs and gluons, why is its mass only 80x larger than the net 2 up quarks and 1 down quark? Posted: 24 Jan 2017 01:38 PM PST I was going through this article which begins explaining the chaos that is a proton. Yet I was a little uncertain on why the observed mass of a proton is not significantly larger than these "zillion" quark/antiquark pairs. submitted by /u/CallMeDoc24 [link] [comments]

With MRI Magnets being ridiculously strong, Why don't they affect compasses, systems, animals, etc ? Posted: 24 Jan 2017 08:07 PM PST I have heard that MRI magnets are something like 60,000 x stronger than the earth's magnetic field. If this is true, with thousands of them in operation world wide. Why aren't compasses, animals who navigate by the earth's north pole, instruments, and even the earth's magnetic poles affected by them ? submitted by /u/mythos_logos [link] [comments]

If forces are mediated by particles, how does a mass deficit arise in bound systems? Posted: 24 Jan 2017 01:41 PM PST For example, gravitationally bound objects have lesser mass when their potential energy increases. If the force is mediated by a graviton, is it not this massless particle giving rise to the bound nature of the system and increasing its potential energy? How exactly does mass decrease when gravitons (or in generally any force-mediating particles) are present? submitted by /u/CallMeDoc24 [link] [comments]

Expansion velocity of a nuclear fireball? Posted: 24 Jan 2017 03:57 PM PST After the reaction begins, how rapidly does this thing expand, from like 0 - 10m or 0 - 50m? I would assume its velocity drops over distance but I don't know. submitted by /u/Leg_day_ft_LordBoros [link] [comments]

Why are electromagnetic waves represented by their frequency? Posted: 24 Jan 2017 05:08 PM PST I might be wrong but aren't all waves traveling like this ? This is an example of sound waves but isn't it the same for electromagentic waves? submitted by /u/Kaisen25 [link] [comments]

What are the arguments for and against Chronic Fatigue? Posted: 24 Jan 2017 10:49 AM PST I have been trying to find information on Chronic Fatigue and there seems to be a lot of contradicting information surrounding whether or not it's a real disease. Some of the info also didn't seem like it was credible (both for arguments for and against). I also asked a friend of mine in the medical field and she seemed just rolled her eyes but didn't say much more. So I'm genuinely curious now what the arguments are for and against Chronic Fatigue. submitted by /u/moxie516 [link] [comments]

How do they make sure when building a tall skyscraper, it remains straight ? Posted: 24 Jan 2017 08:19 AM PST ive always wondered when you see these 200 + meter skyscrapers, how do they keep them perfectly straight when building ? Considering most of the work is done level by level, a slight error in measurements will mean the tower will slowly taper off to being crooked. Is there special tools that they use ? submitted by /u/Stealthbombing [link] [comments]

When free falling, is it better to hold on to something or not? Posted: 24 Jan 2017 10:41 AM PST If I was to jump out of a 5th story window (disregarding the shape/composition of the object), would it be better to free fall or strap myself to an object i.e. would something I had strapped myself to absorb any of my impact with the ground? Would I have a better chance of survival jumping solo or riding an object to the ground? (we're assuming I'm able to "ride" it to the ground, that's not up for debate) submitted by /u/mm3pt14 [link] [comments]

Why is Homo Florensiensis considered a new species of humans? Posted: 24 Jan 2017 08:01 AM PST The only fossil specimen available is that of a female of small stature. How did the scientists consider this as a new species? Just at, that is a very insignificant sample size. So why the hurry? Edit : please forgive the typo : it is Homo Floresiensis. submitted by /u/anandmallaya [link] [comments]

You are subscribed to email updates from AskScience: Got Questions? Get Answers.. To stop receiving these emails, you may unsubscribe now.	Email delivery powered by Google
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Why do they say not to put a car battery on a concrete floor?

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• Why do they say not to put a car battery on a concrete floor?
• If your visual cortex is damaged, can you see in your dreams?
• Why does staring at a moving optical illusion and looking away cause what you're looking at to appear to be moving?
• How do radio waves (low energy) travel through walls and gamma rays (high energy) travel through walls, but visible light (medium energy) can't go through walls?
• What do all the numbers and letters mean in celestial bodies? i.e. APM 08279+5255 [Super massive black hole]
• Why are some metals stronger than others?
• Is there any evidence to suggest that plant yields are lower in microgravity?
• Hi all. I have seen it stated as fact by those who don't believe in man made climate change that more damage is done by the explosion of one volcano than by all the harmful chemicals released by China in an entire year. Is this myth?
• How do electric and magnetic multipole operators transform under Lorentz boosts?
• Are there any opaque, liquid solutions that become transparent or at least translucent when agitated?
• If has been said of Artificial cranial deformation, which was notably practiced by the Incas of Peru, that it might have resulted in pain and possibly psychiatric issues. To what degree, and on what basis, is that established fact?
• [biology] [reproduction] Can/does a successful and healthy pregnancy affect fertility for a woman?
• Where does the excess energy gained from fission and fusion come from?
• What would happen to metals left in water for exceedingly long amounts of time?
• How to calculate fridge efficiency rating? (EU scale)
• What would happen if you didn't use the restroom, forcing yourself to hold in your waste for an extended period of time?
• How to compute probability distribution function of measurements?
• When a wireman climbs a radio tower etc... are there any maleffects from waves?
• If the pressure from stars fuses hydrogen into heavier and heavier elements, then why were the first hydrogen atoms not fused together shortly after the big bang when they were still very close together and under immense pressure?
• In the context of computer networking, how are 0 bits transmitted and subsequently detected?
• How do neuron action potentials create different information?
• What determines a fluid's boiling point?
• In feynman diagrams, why are positrons viewed as moving backwards through time? How is this a more useful model?

Why do they say not to put a car battery on a concrete floor? Posted: 23 Jan 2017 11:14 PM PST The old wive's tale has been proven anecdotally that putting a car battery on a concrete floor kills the charge. Is there any science behind this or is it coincidental? submitted by /u/bykobbackwardsnu [link] [comments]

If your visual cortex is damaged, can you see in your dreams? Posted: 23 Jan 2017 07:10 PM PST Particularly, can a patient in a coma dream if the auditory or visual cortex is damaged? submitted by /u/hunglikejesus- [link] [comments]

Why does staring at a moving optical illusion and looking away cause what you're looking at to appear to be moving? Posted: 23 Jan 2017 10:11 PM PST For example, the illusions in this video submitted by /u/Trtlman [link] [comments]

How do radio waves (low energy) travel through walls and gamma rays (high energy) travel through walls, but visible light (medium energy) can't go through walls? Posted: 23 Jan 2017 04:29 PM PST It just seems strange that I can send a text when indoors, but the walls block light which has more energy. submitted by /u/AutoCorrekted [link] [comments]

What do all the numbers and letters mean in celestial bodies? i.e. APM 08279+5255 [Super massive black hole] Posted: 23 Jan 2017 07:41 PM PST submitted by /u/Rev_Dragon [link] [comments]

Why are some metals stronger than others? Posted: 23 Jan 2017 11:02 PM PST submitted by /u/rare_wolf [link] [comments]

Is there any evidence to suggest that plant yields are lower in microgravity? Posted: 23 Jan 2017 06:53 PM PST I've been doing some cursory research into plant growth in space and cannot seem to get an answer to this question. There is an abundance of papers on whether plants can grow at all in space (they can), but very little on how microgravity actually affects their yields per unit of growing area. I suppose another way of looking at it would be how plant growth in whatever medium they're using compares to conventional hydroponics or aquaponics. The overarching question I am trying to answer is whether it is worth implementing some form of artificial gravity for future plant growth habitats. Thanks in advance for any help! submitted by /u/propionate [link] [comments]

Hi all. I have seen it stated as fact by those who don't believe in man made climate change that more damage is done by the explosion of one volcano than by all the harmful chemicals released by China in an entire year. Is this myth? Posted: 24 Jan 2017 03:49 AM PST To me it seems impossible as it would totally undermine the idea that humans can significantly effect climate change, although I can find no actual data to back up what is, in my experience, a fairly common argument. submitted by /u/Dwights_Bobblehead [link] [comments]

How do electric and magnetic multipole operators transform under Lorentz boosts? Posted: 23 Jan 2017 05:14 PM PST We learn electric and magnetic fields are simply frame-dependent phenomena (e.g. if moving with charge then one only observes a magnetic field). Is there an analog with the dipole operators? If we were in another frame, would this magnetic dipole operator appear to be an electric dipole operator? Since electric dipole operators change parity, would an electric dipole operator appear to change parity in one frame and not the other? The monopole case (i.e. a charge) is Lorentz-invariant, but what about multipoles in general? submitted by /u/CallMeDoc24 [link] [comments]

Are there any opaque, liquid solutions that become transparent or at least translucent when agitated? Posted: 23 Jan 2017 04:24 PM PST Like, you could use it to make a reverse snow-globe that would reveal the scene when you picked it up and shook it. submitted by /u/Solesaver [link] [comments]

If has been said of Artificial cranial deformation, which was notably practiced by the Incas of Peru, that it might have resulted in pain and possibly psychiatric issues. To what degree, and on what basis, is that established fact? Posted: 24 Jan 2017 05:14 AM PST I'm referring to practices such as displayed on the Paracas skulls and some Maya. I'm supposing it is not being practiced anymore, but I do not know so for a fact. Anything else we know about this practice and its effects is fair game. submitted by /u/Gargatua13013 [link] [comments]

[biology] [reproduction] Can/does a successful and healthy pregnancy affect fertility for a woman? Posted: 23 Jan 2017 07:43 PM PST In my case, after my first child, my menstrual cycles were actually lighter, shorter, and less painful. I'm wondering if there's any bearing on fertility after a healthy pregnancy, like the body "recognizes" that it's done this before and can work better at doing it again? I searched online, but all the info I found was on factors affecting infertility. submitted by /u/HautHauswife [link] [comments]

Where does the excess energy gained from fission and fusion come from? Posted: 23 Jan 2017 03:26 PM PST Every visualization of fission and fusion just shows excess energy flying away after the reaction, but where does that energy come from. On fusion, i read that the low binding energy per nucleon enables you to realese energy, but how and why? Also, i sometimes hear that the bonds, both atomic and chemical, doesn't hold energy, instead, you realese energy when you put things together, whats up with that? I thought that bonds was holding stored energy? submitted by /u/Cookie_Nation [link] [comments]

What would happen to metals left in water for exceedingly long amounts of time? Posted: 24 Jan 2017 06:45 AM PST For example, say you left a piece of steel or iron for 100 days or even a few years, what would happen to it by the time you came back for it? And, would different metals exprience the same reaction or lackthereof? submitted by /u/Dragonesus [link] [comments]

How to calculate fridge efficiency rating? (EU scale) Posted: 23 Jan 2017 06:08 PM PST Hey guys. I'm looking to find out how to calculate the efficiency rating for a fridge (European Union scale). I know the capacity of the fridge, and the kWh consumption in a week of standard use. Long story short, I'm living in a rented apartment and I noticed the fridge had the compressor running very often (fridge was included in the apartment). Then I looked at the label and noticed it says "Made in West Germany". That seemed odd, it's not everyday you run into an appliance that's probably older than you. I bought one of those energy consumption meters and measured the weekly consumption during a week of standard use, and multiplied by 52 to obtain the consumption per annum. Turns out this tiny old 164L fridge has a yearly consumption of 842.4 kWh (16.2 weekly). Considering how energy expenses are not included in the rent, I feel compelled to bring this up with the land lord, and I'd like to have a rough idea of where in the efficiency scale this fridge would fit. Thank you. submitted by /u/Deimos_F [link] [comments]

What would happen if you didn't use the restroom, forcing yourself to hold in your waste for an extended period of time? Posted: 23 Jan 2017 04:34 PM PST submitted by /u/RickDLetsDraw [link] [comments]

How to compute probability distribution function of measurements? Posted: 23 Jan 2017 03:24 PM PST I have a set of wave heights for ~20 years in monthly averages and I need to find the probability distribution function, could someone guide me with some steps to do that? Thanks in advance! submitted by /u/pikapsou [link] [comments]

When a wireman climbs a radio tower etc... are there any maleffects from waves? Posted: 23 Jan 2017 11:26 PM PST submitted by /u/therealrufusvex [link] [comments]

If the pressure from stars fuses hydrogen into heavier and heavier elements, then why were the first hydrogen atoms not fused together shortly after the big bang when they were still very close together and under immense pressure? Posted: 23 Jan 2017 12:51 PM PST submitted by /u/opis08 [link] [comments]

In the context of computer networking, how are 0 bits transmitted and subsequently detected? Posted: 23 Jan 2017 07:32 PM PST Say for example I have a router that is transmitting a network message over a fiber optic cable. As I understand it, the router will transmit this message as a series of bits represented by light pulses. I assume a 1 bit (representing an "on" state) would be sent as a light pulse, but in this case how would a 0 bit be sent? Also how would the network device on the other end confirm that it has received a 0 bit? submitted by /u/meineMaske [link] [comments]

How do neuron action potentials create different information? Posted: 23 Jan 2017 05:52 PM PST Basically, every action potential really is just the influx and exit of Na+ and K+ ions, right? And then they'll release neurotransmitters which just make it more or less likely to fire. So my question is: How does the brain treat a neuron action potential from the ears different from one from the eyes? And if neurotransmitters only increase or decrease the likelihood of an action potential, then why not just name them "excitatory" or "inhibitory"? Why does the brain SEE from one AP, but HEAR from another if it's really just the same information? If I were to somehow reroute neurons from my auditory sense and make them connect to the vision area of my brain, would I "see" when I am actually "hearing"? submitted by /u/bennettsaucyman [link] [comments]

What determines a fluid's boiling point? Posted: 23 Jan 2017 02:30 PM PST I was recently looking over temperatures at which gases become liquids, and noticed that helium boils at -452 degrees Fahrenheit, while hydrogen boils at -423 degrees Fahrenheit. What determines these temperatures? Is it atomic/molecular structure? submitted by /u/Mouth0fTheSouth [link] [comments]

In feynman diagrams, why are positrons viewed as moving backwards through time? How is this a more useful model? Posted: 23 Jan 2017 10:16 AM PST How is this possibly more useful than a positron moving forward in time? submitted by /u/LiveClimbRepeat [link] [comments]

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