What are the main complications stopping us from using nuclear fusion?

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• What are the main complications stopping us from using nuclear fusion?
• Why doesn't the glass inside optic fibers break?
• Why doesn't electromagnetism violate parity conservation?
• Ask Anything Wednesday - Biology, Chemistry, Neuroscience, Medicine, Psychology
• How does star size affect planetary characteristics?
• How do we know how much % of its fuel the sun has burned through?
• How come protons in a nucleus don't instantly "push" each other away but rather the nucleus decays over a long time?
• Today I saw the equation "PV=nRT". Why do the variables all match exactly? Why don't we have to multiply R by 1.25? Or P by 0.5?
• Is it possible to change the shape of a single molecule (stretching, compressing, flexing, etc.) without breaking the atomic bonds?
• How did China utilize quantum entanglement to transfer data?
• Why do energy levels converge at higher energies?
• Why can't we capture carbon with trees or technology?
• Does a Bragg curve apply to beta particles too?
• Have we figured out why electricity and magnetism so closely related?
• How efficient is a star's conversion of matter into energy?

What are the main complications stopping us from using nuclear fusion? Posted: 03 Oct 2017 06:14 PM PDT submitted by /u/Noveross [link] [comments]

Why doesn't the glass inside optic fibers break? Posted: 04 Oct 2017 06:47 AM PDT submitted by /u/meshal-alnashri [link] [comments]

Why doesn't electromagnetism violate parity conservation? Posted: 03 Oct 2017 03:58 PM PDT The Wu experiment demonstrated that the weak force violated parity conservation because the direction of emission of electrons from cobalt atoms changed when an electrical coil around them was mirrored. But doesn't the same effect happen when you remove the cobalt and just look at the magnetic field produced by the coils? The magnetic field changes from pointing up to pointing down (or vice versa) when the coil's direction is changed, so the mirror image changes more than just the reflected coordinate. submitted by /u/Skylord_a52 [link] [comments]

Ask Anything Wednesday - Biology, Chemistry, Neuroscience, Medicine, Psychology Posted: 04 Oct 2017 08:10 AM PDT 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]

How does star size affect planetary characteristics? Posted: 03 Oct 2017 03:09 PM PDT I'm most interested whether the current model(s) of star/planet formation show any trends between star size and the characteristics of planets in orbit. For example, are larger stars expected to have more or fewer planets? Is there a negative or positive correlation between star and planet size? Are "Hot Jupiters" more or less likely with giant or dwarf stars? Answers to any and all of these questions would be very helpful since I've had a devil of a time looking them up. submitted by /u/aeyamar [link] [comments]

How do we know how much % of its fuel the sun has burned through? Posted: 04 Oct 2017 04:12 AM PDT I understand that we can look at the sun and, through various methods (e.g. spectroscopy) determine its mass and composition. But how do we know that the sun has burned through (about) half of its fuel? Phrased another way: how do we know how much fuel it started with? submitted by /u/drafterman [link] [comments]

How come protons in a nucleus don't instantly "push" each other away but rather the nucleus decays over a long time? Posted: 04 Oct 2017 01:38 AM PDT submitted by /u/RestInBeatz [link] [comments]

Today I saw the equation "PV=nRT". Why do the variables all match exactly? Why don't we have to multiply R by 1.25? Or P by 0.5? Posted: 03 Oct 2017 07:39 PM PDT It boggles my mind that everything is so.... perfect. Did n and R only come about because of this equation, and so were given arbitrary values that caught on? submitted by /u/soupmeister [link] [comments]

Is it possible to change the shape of a single molecule (stretching, compressing, flexing, etc.) without breaking the atomic bonds? Posted: 03 Oct 2017 09:30 AM PDT submitted by /u/pope4president [link] [comments]

How did China utilize quantum entanglement to transfer data? Posted: 04 Oct 2017 05:41 AM PDT submitted by /u/speech_freedom [link] [comments]

Why do energy levels converge at higher energies? Posted: 04 Oct 2017 05:26 AM PDT For example, in the emission line spectrum of hydrogen the lines of the different series converge because energy levels converge at higher energies. submitted by /u/lolodoggo [link] [comments]

Why can't we capture carbon with trees or technology? Posted: 03 Oct 2017 06:49 PM PDT just wondering submitted by /u/Rrrdude [link] [comments]

Does a Bragg curve apply to beta particles too? Posted: 03 Oct 2017 10:46 AM PDT I am currently working on my High School thesis about ionising radiation and while working on the penetration ability of the different types of radiation, I wondered: Does a Bragg curve apply to beta particles too? Or more specific: Is the relation between the stopping power and distance traveled of beta particles the same as alpha particles? Thanks in regard! (Apologies for any mistakes in term of grammar or vocabulary, english is not my native language) submitted by /u/Dr_Oetlul [link] [comments]

Have we figured out why electricity and magnetism so closely related? Posted: 03 Oct 2017 08:30 PM PDT We know moving charges produce magnetic field and magnetic fields create emf. But have we figured out what causes this and why does it happen? submitted by /u/cranky-alpha [link] [comments]

How efficient is a star's conversion of matter into energy? Posted: 03 Oct 2017 10:33 AM PDT What percentage of each hydrogen atom is actually converted to energy while undergoing fusion? submitted by /u/myliit [link] [comments]

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Does running a mile in 10 minutes burn the same number of calories as walking a mile in 20 minutes?

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• Does running a mile in 10 minutes burn the same number of calories as walking a mile in 20 minutes?
• Are there kinds of stars in the universe that are completely "abnormal" compared to stars that we know of?
• What are the differences between a GPU and a CPU? How is the GPU able to render graphics better?
• Will a concave mirror cancel out the convex mirror effect and vice versa?
• If an object with mass is moving near the speed of light towards me. Does the light reflected from that object "blue shift" into dangerous gamma rays?
• Why can't we create electricity to charge electric vehicles from the rotation of the wheels?
• In the current planning of long-term missions on the Moon, Mars and asteroids, how is the issue of bringing back to Earth terrestrial life forms being addressed?
• When people are allergic to certain animals, what is it about the animals that the human body reacts badly to?
• You're looking at a giant chunk of radioactive material. Are there any visible indications of decay?
• Why does the sun have a well defined surface instead of a smooth transition from dense to diffuse? In other words why doesn't the sun look fuzzy?
• How much energy will the ITER produce if successful--in layman's terms?
• How does a hypernova occur?
• Is there a material that is the equivalent of a superconductor, but for light instead of electricity?
• How do reaction mechanisms go from proposed to approved?
• Why do batteries have internal resistance?

Does running a mile in 10 minutes burn the same number of calories as walking a mile in 20 minutes? Posted: 02 Oct 2017 03:51 PM PDT submitted by /u/8337 [link] [comments]

Are there kinds of stars in the universe that are completely "abnormal" compared to stars that we know of? Posted: 02 Oct 2017 12:38 PM PDT I know of black holes, neutron stars / pulsars, brown dwarfs, and hypergiants... But what else? submitted by /u/IvanOfSpades [link] [comments]

What are the differences between a GPU and a CPU? How is the GPU able to render graphics better? Posted: 02 Oct 2017 06:35 PM PDT submitted by /u/ClF3FTW [link] [comments]

Will a concave mirror cancel out the convex mirror effect and vice versa? Posted: 02 Oct 2017 05:22 PM PDT Also are there any technologies that utilise this? submitted by /u/bananabenana [link] [comments]

If an object with mass is moving near the speed of light towards me. Does the light reflected from that object "blue shift" into dangerous gamma rays? Posted: 02 Oct 2017 06:54 PM PDT So it is my understanding that the light coming from objects moving toward an observer is "blue shifted" and the wavelengths compressed. If this is true can the light be so shifted that it is harmful to an observer? For example, if say "the flash" was holding a flashlight and running toward me at relativistic speeds, does the light get compressed to gamma rays? submitted by /u/SkunkMonkey420 [link] [comments]

Why can't we create electricity to charge electric vehicles from the rotation of the wheels? Posted: 02 Oct 2017 08:50 PM PDT submitted by /u/dtorg29 [link] [comments]

In the current planning of long-term missions on the Moon, Mars and asteroids, how is the issue of bringing back to Earth terrestrial life forms being addressed? Posted: 03 Oct 2017 02:04 AM PDT EDIT: I just want to make clear that I am thinking about terrestrial life forms that after surviving in space are brought back to Earth, not alien forms of life and I am not asking about protecting other planets, but the Earth. Since governments and private companies are planning long-term missions, colonies and mining activities on other celestial bodies, and given that some terrestrial life forms will survive and become very resistant to harsh conditions, what measures are being established now while planning those missions in order to avoid spreading these organisms on Earth? submitted by /u/luxux3 [link] [comments]

When people are allergic to certain animals, what is it about the animals that the human body reacts badly to? Posted: 03 Oct 2017 05:32 AM PDT submitted by /u/ory1994 [link] [comments]

You're looking at a giant chunk of radioactive material. Are there any visible indications of decay? Posted: 02 Oct 2017 04:13 PM PDT Like if the half-life of the isotope is 15 minutes or so, could you look at it and be able to see that it's decaying with the naked eye? submitted by /u/JohnnyStringbean [link] [comments]

Why does the sun have a well defined surface instead of a smooth transition from dense to diffuse? In other words why doesn't the sun look fuzzy? Posted: 02 Oct 2017 11:43 AM PDT Do the rules regarding the density of a plasma yield the observed solar surface? submitted by /u/_bobby_tables_ [link] [comments]

How much energy will the ITER produce if successful--in layman's terms? Posted: 02 Oct 2017 08:20 AM PDT I was reading this article which states that the ITER will produce 500MW of power out of an input of 50MW. The efficiency itself is very exciting, but what does it actually mean? How many homes can you run on that, and for how long? And will it produce 500MW a day, 500MW an hour...? Bonus: Assuming ITER works 100% as intended, will they use it commercially or is it just a proof-of-concept? What'll the lifespan of this behemoth of a reactor be in a best case scenario? submitted by /u/danherczak [link] [comments]

How does a hypernova occur? Posted: 02 Oct 2017 05:56 PM PDT I know it has something to do with a supernova having a supernova. submitted by /u/DeKingWalrus [link] [comments]

Is there a material that is the equivalent of a superconductor, but for light instead of electricity? Posted: 02 Oct 2017 12:47 PM PDT I understand that there are "superconducting" materials which can achieve an electrical resistance of zero ohms - is there a similar material or class of materials (not a vacuum) that can achieve a zero attenuation for light or other EM wavelengths? submitted by /u/foodfighter [link] [comments]

How do reaction mechanisms go from proposed to approved? Posted: 02 Oct 2017 05:19 PM PDT Pretty much what it says in the title, I've just been wondering lately, what makes a mechanism be recognized by the scientific community as the most likely thing that happens on the molecular/atomic level when the corresponding chemical reaction takes place in real life? submitted by /u/Three-Oh-Eight [link] [comments]

Why do batteries have internal resistance? Posted: 02 Oct 2017 08:44 AM PDT College student here with some questions after my basic EMF physics lecture. The prof brought up a lot of things but can't go over them due to time constraints so I'd ask here. 1) Why do batteries have internal resistance? 2) How does a defibrillator return the heart to a normal beating rate when such a current through the body would stop it in the first place? 3) Why has the conventional "positive charges flow" not been changed now we know it is electrons that move through the circuit? Thank you everyone for your time, I'm sure to be back with more questions in the future. submitted by /u/IamWongg [link] [comments]

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If doctors can fit babies with prescription eye ware when they can't talk, why do they need feedback from me to do the same thing?

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• If doctors can fit babies with prescription eye ware when they can't talk, why do they need feedback from me to do the same thing?
• What exactly happens when you have a knot in your back? If the muscle hasn’t actually tied itself up, has it hardened?
• Are there documented cases or evidence supporting postpartum depression in animals other than humans?
• Why can humans control an involuntary action (breathing) but not choose to control your heart rate?
• What are the environmental side-effects of burning oil fields during wars?
• Does 'mastering' fusion mean making current fusion reactor designs a lot more efficient, or is there a different design or process we are hoping to figure out?
• Are we wholly dependant on naturally-produced curare for surgery, or are there synthetic alternatives? If we have synthetics, how do they compare?
• Does our moon have a name in common english?
• What is the radiation level on the ISS and Mars compared to Earth?
• What is the smallest size stars can have?
• What happens if an astronaut gets a nosebleed while in space?
• If a bowl of fresh strawberries is sprinkled with sugar, and a few minutes later the berries are covered with juice, how does that happened?
• What exactly is the "mass" of an atom or a partitcle? And how did the particle have mass?
• What happens if two electrons collide when they are orbiting a nucleus?
• How do shoes affect your feet's bones and muscles?
• How do Majorana Fermions exist? And why do people think that neutrinos are a example of a Majorana Fermion?
• Would it be possible to create helium-4 by introducing helium-3 to a neutron rich environment?
• How long does it take UV rays absorbed by your skin to be converted to vitamin D?
• Is there a scent that distinguishes all (or most) female mammals from males? Can animals tell the difference between females and males of other species?
• what sources do we have to understand climate in early historical times?
• Why does light not bend when it hits perpendicular to a new medium?

If doctors can fit babies with prescription eye ware when they can't talk, why do they need feedback from me to do the same thing? Posted: 01 Oct 2017 07:20 PM PDT submitted by /u/professional_novice [link] [comments]

What exactly happens when you have a knot in your back? If the muscle hasn’t actually tied itself up, has it hardened? Posted: 02 Oct 2017 03:03 AM PDT submitted by /u/thebulge93 [link] [comments]

Are there documented cases or evidence supporting postpartum depression in animals other than humans? Posted: 01 Oct 2017 08:37 PM PDT submitted by /u/karineha [link] [comments]

Why can humans control an involuntary action (breathing) but not choose to control your heart rate? Posted: 01 Oct 2017 02:52 PM PDT submitted by /u/leftfootedeagle [link] [comments]

What are the environmental side-effects of burning oil fields during wars? Posted: 02 Oct 2017 01:53 AM PDT I mean, it definitely doesn't look healthy when ISIS is burning oil fields in Iraq, or when Iraq was burning the oil fields in Kuwait. However, is burning the oil straight from the fields any different from refining it then burning gasoline, or burning diesel? Does it even out in the long-term, even if it must create a massive amount of smog (or something) while it is burning? submitted by /u/pat_the_brat [link] [comments]

Does 'mastering' fusion mean making current fusion reactor designs a lot more efficient, or is there a different design or process we are hoping to figure out? Posted: 02 Oct 2017 07:38 AM PDT You hear people talking about the amazing potentials if we master or 'have' easy fusion, while current designs are struggling to be positive in net energy output. Does 'having fusion' just mean making the current design a lot more efficient, or is there a specific design, process or way of approaching fusion we don't know how to do yet? submitted by /u/Impriv4te [link] [comments]

Are we wholly dependant on naturally-produced curare for surgery, or are there synthetic alternatives? If we have synthetics, how do they compare? Posted: 02 Oct 2017 03:55 AM PDT submitted by /u/Gargatua13013 [link] [comments]

Does our moon have a name in common english? Posted: 01 Oct 2017 08:00 AM PDT Saturn's moons all have names, what is ours? submitted by /u/SloppyMoses [link] [comments]

What is the radiation level on the ISS and Mars compared to Earth? Posted: 02 Oct 2017 06:44 AM PDT With all the news about humans going to Mars, and articles claiming that it could not be the best idea, I would really like to know what is the difference. Basically, if Earth is very good (due to the "magnetic bubble") being a 10/10, and space is very bad (1/10) I was wondering how bad the radiation is on the ISS or on Mars. Is there anything that can be done? Any kind of material good enough to be used as a shelter? Would underground construction on Mars (or the Moon) would make more sense? submitted by /u/readball [link] [comments]

What is the smallest size stars can have? Posted: 02 Oct 2017 12:37 AM PDT I just learned the difference between Big and Massive. If the least smallest mass a star can have is the fine line between gass giant and brown dwarf, what is the smallest size a star can have? Is it possible for it to be anything more than a brown dwarf? submitted by /u/AoiMizune [link] [comments]

What happens if an astronaut gets a nosebleed while in space? Posted: 01 Oct 2017 12:27 PM PDT I've heard that liquid balls up when exposed to the microgravity of space and this happening in a body part like the nose could be dangerous to the astronaut. Is there a protocol or something? submitted by /u/bk2mummy4u [link] [comments]

If a bowl of fresh strawberries is sprinkled with sugar, and a few minutes later the berries are covered with juice, how does that happened? Posted: 01 Oct 2017 07:01 PM PDT submitted by /u/PulseFiighter [link] [comments]

What exactly is the "mass" of an atom or a partitcle? And how did the particle have mass? Posted: 02 Oct 2017 06:10 AM PDT I've been reading some books and documents about this but they seem to be very difficult to understand. I would love to be enlighted. Please, any one??? submitted by /u/bboydragonwing [link] [comments]

What happens if two electrons collide when they are orbiting a nucleus? Posted: 02 Oct 2017 06:09 AM PDT Just researching Cosmos. It got me thinking. As electrons orbit an atoms nucleus, what would happen if two of the electrons collided? submitted by /u/whidzee [link] [comments]

How do shoes affect your feet's bones and muscles? Posted: 01 Oct 2017 06:43 PM PDT submitted by /u/drfrango69 [link] [comments]

How do Majorana Fermions exist? And why do people think that neutrinos are a example of a Majorana Fermion? Posted: 02 Oct 2017 05:48 AM PDT I was researching about Dirac fermions when I came across Majorana fermions. these fermions are supposedly their own antiparticle yet from what I've learnt, when particles interact with the counterparts they annihilate each other. So wouldn't Majorana fermions be constantly annihilating itself? Also if neutrinos are an example of a Majorana particle then what is beta decay emitting when the neutron changes to a proton? Thanks so much for the answers in advance! submitted by /u/JackTalle [link] [comments]

Would it be possible to create helium-4 by introducing helium-3 to a neutron rich environment? Posted: 02 Oct 2017 05:43 AM PDT submitted by /u/Mythical_NZer [link] [comments]

How long does it take UV rays absorbed by your skin to be converted to vitamin D? Posted: 01 Oct 2017 02:01 PM PDT I have a vitamin d deficiency so I've been sunning myself every day for thirty minutes. Only for a couple days so far though. How long does it usually take for the absorbed nutrients from the sun to convert to vitamin D in one's body? submitted by /u/russkiyedinarog [link] [comments]

Is there a scent that distinguishes all (or most) female mammals from males? Can animals tell the difference between females and males of other species? Posted: 01 Oct 2017 04:36 PM PDT submitted by /u/whythecynic [link] [comments]

what sources do we have to understand climate in early historical times? Posted: 01 Oct 2017 05:12 PM PDT submitted by /u/JaxxManican [link] [comments]

Why does light not bend when it hits perpendicular to a new medium? Posted: 01 Oct 2017 10:40 AM PDT submitted by /u/skierman98 [link] [comments]

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