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Thursday, May 4, 2017

How do third party headphones with volume control and play/pause buttons send a signal to my phone through a headphone jack?

How do third party headphones with volume control and play/pause buttons send a signal to my phone through a headphone jack?


How do third party headphones with volume control and play/pause buttons send a signal to my phone through a headphone jack?

Posted: 04 May 2017 03:11 AM PDT

I assume there's an industry standard, and if so who is the governing body to make that decision?

submitted by /u/crossfirehurricane
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Any topology experts care to explain why this doesn't produce a knot?

Posted: 03 May 2017 06:17 PM PDT

Why do fluorescent tubes contain mercury vapour?

Posted: 04 May 2017 02:50 AM PDT

I understand the the mercury electrons become excited, move up and energy level and then release a UV photon which then passes on energy to the electrons of a phosphorus coating, but why can't the electrons from the voltage supply pass on their charge directly to the electrons of a phosphorus atom inside the tube which would then emit the visible light photons, removing the need for the mercury vapour?

submitted by /u/tepson7
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What are the practical applications of calculus?

Posted: 04 May 2017 01:50 AM PDT

Both in the modern day and at the time it was first discovered?

submitted by /u/MeatyOs
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If a person is right-handed, does such dominance include all voluntary muscles? For example, are the muscles in the larynx also somewhat right-dominant?

Posted: 03 May 2017 02:10 PM PDT

What causes the chaotic rotation of celestial bodies such as Pluto's moon Nix or Saturn's moon Hyperion?

Posted: 03 May 2017 04:54 PM PDT

Here is a simulation of the rotation of Pluto's moon Nix. According to wikipedia, it's rotation can only be predicted 30 days into the future before it becomes too chaotic. What causes this chaotic rotation?

submitted by /u/Fart17
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Is "touching" caused by electromagnetic forces or the Pauli exclusion principle?

Posted: 04 May 2017 12:54 AM PDT

Does string theory make predictions that can be measured in experiments?

Posted: 03 May 2017 11:40 PM PDT

I heard several talks about string theory, but usually they are very technical and no one was able to give me some examples of predictions made by string theory that can be investigated in experiments, for example, at the LHC.

submitted by /u/-lq_pl-
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Is it possible for the neurological effects of autism to wear off as a person gets older? If so, how?

Posted: 03 May 2017 11:45 AM PDT

Why are our organs in the places that they are? From an evolutionary perspective what benefit is there having our heart in between the lungs rather than elsewhere?

Posted: 03 May 2017 12:37 PM PDT

If every force is countered by a normal force in the opposite direction, how does anything actually move?

Posted: 04 May 2017 05:49 AM PDT

How did people calculate the Gravitational constant G?

Posted: 04 May 2017 05:03 AM PDT

What would happen if you ate a piece of meat with cancer cells in it?

Posted: 04 May 2017 04:51 AM PDT

Do objects less than 5730 years old have accurate dating measurements?

Posted: 03 May 2017 07:33 PM PDT

Okay so this may be a dumb question, but need an answer quick and didn't have the time to do enough research myself to answer it. So I'm having some debates with my parents (hardcore Creationists, I'm undecided at this point lol) one of my arguments for the errors in the creation story is the fact that dating techniques are pretty accurate and are no where near the claims of 7000 years like they like to say. I came across this one question though; if dating techniques are only accurate for greater than the half life of the element used, and carbon-14 has the smallest half life of 5730 years, is it hypothetically possible that all materials ever tested are less that 5730 years old (sort of close to a creationists timeline), and therefore all measurements can be listed as inaccurate? I may be completely out to lunch here and I apologize if I am. I'm not looking for other reasons as to why old-earth is a lot more plausible (there are enough that I am aware of already). Thanks for your time.

submitted by /u/Silvanus11
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Is it possible for nuclear fuel to accidentally reach criticality?

Posted: 03 May 2017 05:21 PM PDT

I'm gathering information for a story I'm writing and I want all aspects of the story to be as plausible as possible.

So as the question states, whether in travel or handling accidents, if fuel rods were majorly damaged in any way and the pellets somehow spilled into a massive pile could it possibly go critical?

Or is there a reactor fuel source other than PWR fuel rods that would be contained in a way that makes them more likely to go critical?

Thank you for any assistance you can lend in the matter.

submitted by /u/s_cudi
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What is it about the chemical properties of metals such as Gold, Silver, and Titanium that make them hypoallergenic?

Posted: 03 May 2017 12:53 PM PDT

My understanding is that most of a metal "allergies" are caused by irritation due to the metal's oxide. Even though these metals are considered to be relatively unreactive, they can still be oxidized. If this is the case, why are they less likely to cause problems?

submitted by /u/livelytostito
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When a full tooth is knocked out, then later reinserted, how does it re-bond with the gums?

Posted: 03 May 2017 02:13 PM PDT

Basketball player Isaiah Thomas had his tooth knocked out then had a dentist procedure the next day to reinsert it. Do dentists just stick it back in and the gums clamp back down on it? Or do they use a biodegradable glue, or a mechanical fixture?

submitted by /u/SkinnyHusky
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Four years after the confirmation of the Higgs Boson, what has been the impact on theoretical physics? Are there any new theories developed from it, or theories abandoned?

Posted: 03 May 2017 01:05 PM PDT

I think I read that Supersymmetry took a big hit because of the 125 GeV, but I really don't know much more beyond that.

submitted by /u/cahman
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Will the derivative of the proca action with respect to time and velocity result in the momentum that of a photon?

Posted: 04 May 2017 01:35 AM PDT

How do fusion reactors work?

Posted: 03 May 2017 04:31 PM PDT

How can you get more energy out of the reaction than you put in to get it too the required temperature and pressure?

submitted by /u/10111001110
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What is entanglement entropy?

Posted: 03 May 2017 01:29 PM PDT

Can someone give a simple explanation what the idea behind entanglement entropy is?

submitted by /u/KuusamoWolf
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Wednesday, May 3, 2017

How are we able to estimate the Planck's constant at a much higher accuracy (44 per billion) than the gravitational constant G (120,000 per billion)? What is affecting the measurement of G?

How are we able to estimate the Planck's constant at a much higher accuracy (44 per billion) than the gravitational constant G (120,000 per billion)? What is affecting the measurement of G?


How are we able to estimate the Planck's constant at a much higher accuracy (44 per billion) than the gravitational constant G (120,000 per billion)? What is affecting the measurement of G?

Posted: 03 May 2017 03:58 AM PDT

I'm asking because I was reading about the Planck's units and how almost all of the uncertainty in them comes from the value of G.

submitted by /u/Niamrej
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When you dip a napkin in water and the napkin eventually soaks up, where is the energy coming from to move the water up the napkin?

Posted: 03 May 2017 03:19 AM PDT

The water moves up the napkin and eventually soaks it upwards, what is making the water and moisture move upwards? Where does the energy lifting the water up come from given energy cannot be created or destroyed? Might be a dumb question, but it's bugging me.

submitted by /u/pillihp
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Why is the specific heat capacity of an object dependant on its temperature?

Posted: 03 May 2017 03:19 AM PDT

Where would I weigh less? The top of Mount Everest, which is further from the Earth but has less centripetal force acting on you to make you lighter, or the top of Mount Kilimanjaro, which is very close to the equator, but also closer to Earth?

Posted: 02 May 2017 06:09 PM PDT

I realise that the effect of centripetal force is incredibly minor, but is it a smaller effect than the change in gravity between those two places?

submitted by /u/GameDesignerMan
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Why is the periodic table such a great historical accomplishment? I understand that Mendeleev was ahead of his time but I never understood what it is he actually did, or how he did it to be able to get his results.

Posted: 03 May 2017 04:56 AM PDT

'Chemistry'

submitted by /u/fleebflob
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Which evolved first, herbivores or carnivores?

Posted: 02 May 2017 06:38 PM PDT

I looked through various google results but I couldn't figure it out.

submitted by /u/freshthrowaway1138
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Are LEO satellites visible with the naked eye?

Posted: 03 May 2017 03:37 AM PDT

Does the depletion of oxygen in the sea vary with level of pollution in the respective area?

Posted: 03 May 2017 12:47 AM PDT

Are all the planets in our Solar System rotating around the sun on the same level (plane)?

Posted: 02 May 2017 04:48 PM PDT

All pictures show the planets on the same level or plane. Is that true or is it simplified for the general public? Or do the planets circle the sun with each planets orbit following it's own path?

If they do orbit the sun on the same level is that because the sun causes them to rotate along a certain axis?

Sorry if it's been explained before but I couldn't find the answer to my actual question(s). Thanks in advance

submitted by /u/cynic_male
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How do black holes get larger?

Posted: 02 May 2017 09:01 AM PDT

When an object moves towards the event horizon of a black hole, it experiences increasing time dilation from our perspective. If it takes an infinite amount of time for matter to "cross" the event horizon then how can a black hole grow in size in any meaningful time period? Wouldn't all the new matter just run into the old matter outside the event horizon as it hits slower and slower time "areas"?

submitted by /u/Midvia
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In what ways does microgravity induced osteoporosis differ from osteoporosis gained in normal gravity?

Posted: 02 May 2017 03:22 PM PDT

As well as this, how is osteoporosis induced from microgravity treated differently to other types of osteoporosis?

submitted by /u/ohreo
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Why is a group of clouds often on an equal altitude instead of varying in altitude?

Posted: 02 May 2017 12:14 PM PDT

If salt is dehydrating, how is it used in sports drinks to keep you hydrated?

Posted: 02 May 2017 12:35 PM PDT

I understand salt helps retain water, but then why do they say that eating salt is bad for dehydration?

submitted by /u/ifyoureadthisfuckyou
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Are there any animals that are known to celebrate events?

Posted: 02 May 2017 12:32 PM PDT

Humans celebrate all sorts of things, from events like birthdays to achievements like getting a raise or winning a game. We typically perform some sort of celebration that involves other humans. Are there any animals which do similar things and if so, which ones and why?

submitted by /u/LMGagne
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Why are so many earthquakes in Skagway Alaska showing up as 0.0km depth?

Posted: 02 May 2017 03:38 PM PDT

Can frequent use of Benzodiazepines such as Xanax cause permanent brain damage?

Posted: 02 May 2017 03:23 PM PDT

I recently came across this study, which indicates that frequent use of Benzodiazepines can result in "permanent [cognitive] deficits or deficits that take longer than 6 months to completely recover." Another study, however, found that patients who have ceased Benzodiazepine intake have eventually restored cognitive function after several years. I'd like to know if there have been more conclusive studies done on this subject or if there are any experts here that could shed light on whether a frequent user of Benzodiazepines can eventually restore their former cognitive function.

Side note: I am asking this as a former user of Xanax. Although I personally have not noticed any cognitive impairments as a result of the taking the drug, I've come across many patients who have complained about impaired memory.

submitted by /u/OKRocket
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Is there any wildlife unique only to North Korea?

Posted: 02 May 2017 10:44 AM PDT

Given that North Korea is the most isolated country in the world, and has a large area it stretches on, are there any forms of life unique to North Korea? If so, is there any collaboration between North Korean biologists and biologists from other countries?

submitted by /u/noisleahcim2
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Why does the sun look red as it nears the horizon?

Posted: 02 May 2017 02:34 PM PDT

Why does the color black attract more heat than other colors?

Posted: 02 May 2017 09:34 AM PDT

How do AC to DC adapters work?

Posted: 02 May 2017 10:15 PM PDT

I've been studying AC transformers in my class, and it got me thinking about adapters used for phones, laptops, etc. I know the principle of transformers don't work with DC and the adapters have something to do with diodes. Thanks for the help!

submitted by /u/MoonMoon_2015
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Is it possible to estimate the population density of an organism by analyzing the environmental DNA present in the surrounding medium?

Posted: 02 May 2017 11:21 AM PDT

Hello everyone, I'm a biologist with a specialization in aquaculture. After a conversation with an entrepreneur in the field, I've been researching eDNA as a possible detector for unwanted organisms close to fish farming sites. From what I've read (skimmed through a couple of articles) it should be possible to detect the presence of a specific organism in the water column, but what I'm trying to figure out is if its possible to measure the actual level of this unwanted organism in the water column. Though I'd ask here before I waste my time doing research in the blind.

submitted by /u/Fisco
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Tuesday, May 2, 2017

How will we use the power from a fusion reactor?

How will we use the power from a fusion reactor?


How will we use the power from a fusion reactor?

Posted: 01 May 2017 07:43 AM PDT

Everyone talks about how fusion reactors will change everything. My question is, how will we USE all of this energy? Will we just use it like we do a fission reactor, using the excess heat to generate steam? If so, it seems kind of a waste of money. Or, is there some way to use the plasma to generate electricity (kind of like the EPS conduits in Star trek).

I am only a layman, but I hope to get an answer I can understand. Perhaps they are only concerned with actually getting a working fusion reactor, and then sweating the details later.

Thanks!

submitted by /u/Trevor30024
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How far away could SETI detect Earth?

Posted: 01 May 2017 06:17 PM PDT

Tried to keep the title short, but basically if you duplicated Earth, how far out could you move it before SETI would not be able to detect our current EM emissions?

submitted by /u/Agarax
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How did humans realize that space had no breathable atmosphere before sending the first man into space?

Posted: 01 May 2017 09:29 PM PDT

Does Earth's gravitational field look the same as Earth's magnetic field?

Posted: 02 May 2017 06:54 AM PDT

would those two patterns look the same?

submitted by /u/FoxBattalion79
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Do animals have an individual scent as well as a "species" scent? Can other animals tell them apart?

Posted: 01 May 2017 03:29 PM PDT

For example, could my dog (hypothetically) know which individual squirrels have been in our backyard, or just that squirrels in general have been there?

submitted by /u/vogon-jeltz
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How does Cassini send back images of Saturn and its moons? Using what technology?

Posted: 01 May 2017 10:25 PM PDT

[Engineering] Why does spacex prefer to land on the ground instead of on a barge at sea?

Posted: 01 May 2017 06:03 PM PDT

Today Spacex landed a rocket again, and it went back to the landing zone in Florida. But why do they do this instead of landing on a barge? Wouldn't it save on fuel and therefor costs?

submitted by /u/JustadudeAMA
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What's the processing power of an average car computer and how does that compare to a normal desktop computer?

Posted: 01 May 2017 04:19 PM PDT

What gives chocolate its low melting point?

Posted: 02 May 2017 02:21 AM PDT

if I go with nearly the speed of light in outer space, how long would it take for me to stop moving due to friction?

Posted: 02 May 2017 01:18 AM PDT

If you have asthma are your lungs always somewhat constricted?

Posted: 01 May 2017 04:27 PM PDT

Also, does taking asthma medicine such as rescue inhalers make the airways comparable to a normal person's or are they still somewhat constricted?

I'm wondering if people with asthma feel its effects even when it's not a full-on asthma attack.

submitted by /u/Benobo
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If a large enough object collided with the sun, would it make a "splash"?

Posted: 01 May 2017 09:54 AM PDT

Do aircraft experience sonic booms as the cross multiples of the speed of sound?

Posted: 01 May 2017 06:54 PM PDT

Also: Is there a complementary boom when decelerating past sound?

What do all of these noises sound like to pilots compared to how they sound on the ground?

submitted by /u/teufelkatzen
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Why does it not matter the way you plug a phone charger in?

Posted: 01 May 2017 06:31 PM PDT

You can plug a phone charger upside down as well as right side up. I know that with motors, they will spin the opposite direction if the polarities are switched. So why doesn't this happen for the phone?

submitted by /u/quadnerd
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Why does your risk of cancer increase as you get older, but your cells lose the ability to divide?

Posted: 02 May 2017 04:07 AM PDT

What is the distance between pulses of light in a fibre optic cable?

Posted: 02 May 2017 03:51 AM PDT

In an undersea fibre optic cable, say for example the Hibernia Transatlantic cable, the bandwidth is in excess of 5Tbps. What is the spacing between the pulses of light and how long are the pulses of light in these high bandwidth cables?

submitted by /u/phiphedog
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Given how powerful it is, how does earth's magnetic field affect humans at a biological level?

Posted: 01 May 2017 03:18 PM PDT

Do the laws of thermodynamics apply to quantum theory?

Posted: 02 May 2017 02:56 AM PDT

Can't find a straightforward answer on google - any help? :)

submitted by /u/hobojones123
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Why does classical science fail at the molecular level?

Posted: 02 May 2017 02:44 AM PDT

I tried searching for this on the internet but I might not have been using the correct keywords because I didn't find anything satisfying. My question is why can't we use newtonian laws (if I understand the conflict correctly) at the level of atoms. Can the attraction between atoms and their repulsion not be modeled like gravitational attraction? I'm aware of things like the heisenberg uncertainty principle but I struggle to understand why the same problems don't present themselves at the planetary or even our scale. Is it just because of the fact that the molecules are affected exponentially more due to their size?

submitted by /u/wololololow
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Is the Quantum Mechanics concept of superposition falsifiable through any possible experiment?

Posted: 01 May 2017 05:55 PM PDT

The math of Quantum Mechanics implies superposition in created particles that have not yet been observed. This concept is also used to describe the real-world state of actual particles. But it seems equally possible that real, actual particles have defined characteristics that are simply unknown until observed. (It's not like we can observe the particle prior to observing it.) Is there any possible experimental setup that could falsify superposition?

submitted by /u/ranchoparksteve
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Can string-theory's Strings be detected by physical means?

Posted: 01 May 2017 03:51 PM PDT

Or are they like "by definition undetectable"?

submitted by /u/LucyNyan
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How do scientists measure the average surface temperature of the earth? Also what's the accuracy?

Posted: 02 May 2017 01:01 AM PDT

What kind of power cord would you need to be able to extract power from a cell phone?

Posted: 01 May 2017 09:09 PM PDT

I have seen it done where you can have a cord plug into a phone with 100% battery and charge a phone with 0% battery. I am just wondering how this is done and if some phones have software or other things that may prevent this.

submitted by /u/willieb3
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