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Monday, May 22, 2017

Why does my shower curtain seem to gravitate towards me when I take a shower?

Why does my shower curtain seem to gravitate towards me when I take a shower?

Why does my shower curtain seem to gravitate towards me when I take a shower?

Posted: 22 May 2017 03:53 AM PDT

I have a rather small bathroom, and an even smaller shower with a curtain in front.

When I turn on the water, and stand in the shower, the curtain comes towards me, and makes my "space" even smaller.

Why is that, and is there a way to easily prevent that?

submitted by /u/DaftDrummer
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Does the volume of my headphones effect battery life, if so, what is the optimal listening volume for energy consumption?

Posted: 22 May 2017 01:19 AM PDT

The title says it all.

submitted by /u/deisidiamonia
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ELIMathematicianNotPhysicist: Quantum Bayesianism. What is it, and how is it different from all the other ways to look at QM?

Posted: 22 May 2017 12:58 AM PDT

Is there anything in space we can see at two different times because of the bending of light on the way here? How much of a difference could be expected?

Posted: 21 May 2017 09:11 AM PDT

I read something like this ages ago and it intrigues me. Can you really see the same thing in two places in the sky?

submitted by /u/hanoian
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What would happen if you shot a nuclear bomb?

Posted: 21 May 2017 05:40 PM PDT

Any gun, let's say like the kind of bombs used on Nagasaki or Hiroshima? Are the shells designed to withstand that? Because I'd guess a big drop has a larger momentum than a gunshot

submitted by /u/CameronBerry96
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When people take videos from older phones, why is it that the video itself will warp so that straight lines become bent?

Posted: 22 May 2017 01:11 AM PDT

How does brain control heart rhythm in people that are from neck down paralyzed?

Posted: 21 May 2017 04:28 PM PDT

If a person is paralyzed due to serious injury to their spinal cord around neck, how does the brain still control the heart or even simple breathing is possible?

submitted by /u/forexross
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Could living things sink or dive into lava? Or is it simply too dense?

Posted: 21 May 2017 05:07 PM PDT

This link is near the top of r/all right now: https://gfycat.com/GranularAnnualBactrian

The comments are full of people talking about diving in.

Would a human actually sink or even be able to get below the surface? Or is molten rock too dense for that? I've wondered this since I was a kid and saw Arnold lowering himself into molten steel at the end of Terminator 2!

submitted by /u/Madmartigan1
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Can you heat something beyond the critical point?

Posted: 22 May 2017 07:26 AM PDT

Let's say that you have water vapor at critical point, can you heat it beyond that and reach 1000 degrees Fahrenheit?

submitted by /u/clarkkentmaster
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Could someone please explain to me the incompleteness theorems?

Posted: 21 May 2017 02:00 PM PDT

I have a slight problem understanding Kurt Gödel's incompleteness theorems, as I don't have any higher education in such fields. It seems to me that it tells that math, and science by extension, can never describe the whole truth. Am I completely off the chart?

submitted by /u/Inri_magine
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Why are we unable to remember our baby memories?

Posted: 21 May 2017 04:44 PM PDT

Some dogs/cats watch TV. Do they understand what they see?

Posted: 21 May 2017 03:54 PM PDT

Especially the ones who can watch a nature program without "freaking out".

submitted by /u/Nafetsg
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What recording device can record 3D surround sound that are not just two-channel stereo?

Posted: 22 May 2017 02:26 AM PDT

The 3D surround sound I mentioned is that kind of sound that can be recognized sound changes including directions, distances and movements. It felts like what recorded is same as we hear in the real world. And we could locate sound even when we close our eyes.

submitted by /u/georgewillson818
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What Technology Would be Needed to Produce Element 119?

Posted: 21 May 2017 03:37 PM PDT

By "What technology" I mean: 1. How powerful would this tech need to be to produce element 119, and 2. What, specifically, would one need to produce element 119.

submitted by /u/SlimierPete
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Why does the liver produce superoxide radicals? My professor said it helps make hydrophobic substances more soluble in water, but I don't understand why.

Posted: 21 May 2017 08:06 PM PDT

Do pheromone sprays actually work?

Posted: 22 May 2017 05:23 AM PDT

I recently came across a pheromone forum where people talk about which sprays to use for certain occasions and the type of effects that they noticed people have when around them.

I then went to the site that the forum promotes and you have sprays that help you with attraction, help people feel good around you, make people open up to you, for trust & respect, for people to be more honest and more.

The members post great results but it feels too good to be true and the paranoid part of me thinks that what is happening is that when trying one of these sprays they're either giving their surroundings more notice to see if it's working or it's some sort of placebo effect where when they spray it confidence goes up and they report it as results.

The reason that I think that there maybe something to it is that it's not a forum with a small number of users, there are a lot of posts and threads on there and it's not like all of them can be because of the above mentioned effects.

So I'm really interested in what people on here know about this subject.

submitted by /u/nachospolsion
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How did someone work out the anatomical structure of tiny animals, such as worms, spiders and ants?

Posted: 21 May 2017 03:27 PM PDT

Why does moving air feel colder on our skin? Shouldn't it feel warmer due to friction?

Posted: 21 May 2017 09:44 PM PDT

When we burn fossil fuels, aren't we just releasing carbon that was once free?

Posted: 21 May 2017 01:24 PM PDT

I don't really understand how we can have the highest levels of CO2 in the history of earth if all this organic matter must have gotten the carbon from the atmosphere to begin with.

submitted by /u/Catdog_ywu
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Will a hair follicle that sprouted a grey hair permanently grow grey hair?

Posted: 21 May 2017 08:58 AM PDT

Let's say you consistently pluck grey hairs out if you're the type to deny it rather than embrace it.

If you pluck the grey hair, will another grey hair grow from that follicle, or could it return to your original hair colour?

submitted by /u/ThePeanut_KJD
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Does the human brain have a memory cap?

Posted: 21 May 2017 03:05 PM PDT

Do we ever reach a limit of the amount of information we can store in our brain?

submitted by /u/tuninzao
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Does "rotating artificial gravity" work in the vacuum of space?

Posted: 22 May 2017 03:01 AM PDT

Let's say there was a spaceship like in one of those science fiction films, where a part of the ship rotates to create artificial gravity.

Now what if an airlock blows out or some thing else happens so that all the air gets sucked out of the rotating disc-ring-thingy. Is there still "gravity" inside? What if a person in a spacesuit somehow enters the ring after the decompression through a hole on a wall or something like that.

Or lets say the tube isn't spinning at all, the astronaut positions him-/herself in the dead center of the pipe, then someone turns the thing on. How does the astronaut gain velocity? Or does he/she?

Some clarifications:

  1. The astronaut doesn't touch anything (walls etc.) and there's no air (no chained contact through air molecules to the structure)

  2. The astronaut is inside and in the dead center of the tubular structure moving around him/her, like the astronaut was going through a tunnel.

  3. Everything has a gravitational pull. How does this force behave in this situation since the object is all around the astronaut and constantly moving?

  4. English isn't my first language, but it's still a valid question.

tl;dr: is the artificial gravity depicted in scifi movies depended on air to function?

EDIT: Everything

EDIT 2: Oh and the ring isn't compartmentalized, it's hollow all the way

submitted by /u/UtopianKing
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On a typical electrical plug, What is reason for the little holes at the end of the two prongs?

Posted: 21 May 2017 04:20 PM PDT

Why is Isotope Fractionation important in Astronomy?

Posted: 21 May 2017 03:02 PM PDT

More specifically, isotopic fractionation in protoplanetary disks? And why is mass independent fractionation important in that context?

submitted by /u/HeavyMetalAstronomer
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Sunday, May 21, 2017

What would happen if the Earth's oceans were replaced with fresh water?

What would happen if the Earth's oceans were replaced with fresh water?

What would happen if the Earth's oceans were replaced with fresh water?

Posted: 20 May 2017 06:27 PM PDT

What does it feel like walking in areas with high radiation? Does it feel hot or something? Does it smell? Harder to breathe? Or is the only way you will figure it out (w/out a Geiger meter) is when you start to get sick?

Posted: 21 May 2017 05:55 AM PDT

EDIT: Sorry for the wrong flair. Not a science guy so I just kind of associated the elements involved with chemistry

submitted by /u/FangFingersss
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What happens to the gas inside a car's tires when it starts moving, while it's going, and when it stops after already moving? Does it stay stationary, or spin with the tire?

Posted: 20 May 2017 04:04 PM PDT

Does our atmosphere always stay a constant shape around Earth?

Posted: 20 May 2017 02:57 PM PDT

Or would it act like the water around the towel in this experiment done on the ISS by Chris Hadfield

submitted by /u/tehdubbs
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[Physics] If there are no states for an electron to occupy between conduction and valence bands, then what is the Fermi Level if it lies between the conduction and valence bands ?

Posted: 21 May 2017 03:23 AM PDT

[medicine] how come you can't just cut off a wart?

Posted: 20 May 2017 04:30 PM PDT

Which would be the problem of a supercritical helium turbine?

Posted: 21 May 2017 03:18 AM PDT

I was looking about molten salt reactors, the 3 of them sodium, fluoride and chloride salt reactors and, i did seen that in many reactor designs there's the reactor liquid fuel internal circuit, and a second circuit which exchanges heat with the primary salt, and then goes to a water heat exhanger that makes the turbine spin, thinked in deleting the intermediate circuit and send water directly to the reactor vessel with a heat exchanger. But then there's the problem of the reactions the sodium and water at those temperatures can make so i thinked why not changing water to helium at very high pressure? Is an inert gas, isn't flamable, and i think it doesn't react with salts

Which would be the pressures to mantain a supercritical or ultrasupercritical helium state at 500ºC? I would get problems trying to condesing it to delviering it to the reactor again?

submitted by /u/Comunismo_videlista
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Where does the number e come from?

Posted: 20 May 2017 02:27 PM PDT

By whom, how and when was it discovered and proved?

submitted by /u/MeatyOs
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Is there a limit to the density of matter?

Posted: 20 May 2017 04:36 PM PDT

For instance in a super massive black hole the density is greater than the density of the sun.

submitted by /u/Itrusteverything
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Efimov physics: could someone explain the significance?

Posted: 20 May 2017 09:59 PM PDT

I stumble on an article about the Efimov Effect. There were only a couple of posts on reddit about it and most of the comments were deleted.

I'm a lay person (ie. don't have a degree in physics) and was hoping someone might be able to explain why pairing three bosons is such a breakthrough. I've searched everywhere for an answer, but couldn't find anything that explained the potential applicability of this or how this alters the classical view of physics.

Is it just that it suggest things work differently at the quantum level than we think?

Thanks!

submitted by /u/joekerr37
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How can you tell if a solid ball of substance is uniformly dense?

Posted: 20 May 2017 07:47 PM PDT

Supposing that any places of lesser density are exactly centered within it, like a perfectly spherical truffle with perfectly spherical chocolate filling, and assuming you don't know what material it is so you can't just try displacement.

submitted by /u/PistachiNO
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Why is Vaseline, a petroleum derived product, good for your skin? Aren't petroleum and plastics bad for your body?

Posted: 20 May 2017 05:26 PM PDT

what is the strange pendulum effect called?

Posted: 21 May 2017 02:56 AM PDT

https://www.youtube.com/watch?v=dDU2JsgLpm4

what is the term for the effect where the sections start and continue to work independantly of each other?

submitted by /u/MattBlackG
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Can a known file be used to crack encryption?

Posted: 20 May 2017 05:45 PM PDT

With the "locker" viruses spreading around lately, I was wondering if having file with well known content, possibly very large, could be used to determine the code used to encrypt that file. TIA

submitted by /u/bobroberts1954
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[Geology][Physics] If we were to drill a hole that reached the core of Earth, what would happen?

Posted: 20 May 2017 04:15 PM PDT

Akin to electric field, does gravitational field store energy too?

Posted: 20 May 2017 02:30 PM PDT

How do LCD dispays work?

Posted: 20 May 2017 04:40 PM PDT

Is it true that one pound of body fat is equivalent to 3,500 calories?

Posted: 20 May 2017 03:57 PM PDT

How does rust affect a chrome spring?

Posted: 20 May 2017 11:19 AM PDT

I bought a grip strength trainer which uses (chrome) springs for resistance. It was secondhand and the springs are partially rusty inside: Picture

Does this weaken the springs and make them more prone to breaking or do I not have to worry about it as long as I get the rust off? I'm gonna put a lot of stress on them over time so I want to be sure here - if there's some concern, I'm going to send it back.

submitted by /u/Mithridates12
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When looking for test subjects for medicines they often ask for non-smokers. Don't they need to test how the drugs affect smokers?

Posted: 20 May 2017 07:07 AM PDT
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Saturday, May 20, 2017

In as simple a way as possible, how are we able to tell the elementary make up of a planet using only a telescope?

In as simple a way as possible, how are we able to tell the elementary make up of a planet using only a telescope?

In as simple a way as possible, how are we able to tell the elementary make up of a planet using only a telescope?

Posted: 20 May 2017 05:19 AM PDT

Just reading a story about how scientists used the Hubble telescope to view HAT-P-26b, s planet 440 light years away. They saw "distinct signatures of water in its atmosphere" and "found fewer heavy elements than they had expected". How can you do this using only a telescope?

submitted by /u/nrthrn_pwrhs
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In T-S or P-V diagrams often there is a number with an s next to it e.g. (5s connected with dashed lines with 4). What is the meaning of that 5s point and what is different from the regular 5?

Posted: 20 May 2017 04:53 AM PDT

Apparently, for Conservation of Energy to be true, time translation symmetry must hold. However, does it really hold in an expanding universe?

Posted: 20 May 2017 12:49 AM PDT

On a relevant note: if we ever find out that the symmetry does not hold, and you can generate infinite energy, would it also invalidate the law that entropy always increases, thus freeing us of the danger of Heat Death, a la The Last Question?

submitted by /u/thetimujin
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They say that a photon takes a million years to make it out of the Sun. But what does it even mean? How do we define that a particular photon now is the "same" photon that was there then?

Posted: 20 May 2017 01:56 AM PDT

When I'm doing photons-in-a-box problem with large enough number of photons, and I add a photon in, and later I let a photon out, there isn't really a sense in which I can say which one of the photons got out, any more that when I add 1+1=2, and then subtract 2-1=1, can I tell which one did I subtract (quite literally, this is how Fourier transform seems to work). They just blend into one wave until I decide to unblend them.

I'm imagining the interior of the Sun to be a giant soup of photons, constantly absorbed, reemitted, bouncing around. Sometimes new photons are created by fusion, and sometimes some photons get out into the interstellar space, but how do we "track" them?

submitted by /u/thetimujin
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When you squint really hard, why do you hear a rushing wind like sound?

Posted: 19 May 2017 03:44 PM PDT

Can you tell a sunrise from a sunset just from looking at a photograph?

Posted: 19 May 2017 06:39 PM PDT

As a star begins to die, what are the effects on orbiting planets before the supernova?

Posted: 19 May 2017 09:52 PM PDT

Say an Earth-like planet (read: Earth) is orbiting a star of 1 solar mass that is nearing it's death. At what point does life on this planet cease to exist (read: no longer habitable)? What exactly happens to scour all possibilities of survival? Or would all be well and good until the supernova begins?

submitted by /u/Sigral
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If I yawn while listening to music, there is a significant noticeable increase in my perception of the speed of the music. Why is this?

Posted: 19 May 2017 04:48 PM PDT

This happens every time, regardless of how tired I am, I use headphones when I listen to music, if I'm moving my head to the beat or something, that keeps in time with the music and I perceive my movement as happening faster too. The increase is between about 20-50%, it varies but it's always a significant difference.

submitted by /u/ScornMuffins
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How do we get high frequency (of few GHz) in electronic circuits ?

Posted: 19 May 2017 06:55 PM PDT

I know about crystal oscillators, that can make frequencies up to 100 MHz and about PLLs, Schmitt-triggered inverters and stuff like that. But I couldn't find a good explanation and put this together to figure out where all does high freqs come from. I guessed it has to do with all the before mentioned concepts, so I would like to clear it out.

submitted by /u/sekirce3
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If you're constantly growing and shedding skin cells, how come your freckles don't disappear/you don't grow new freckles?

Posted: 20 May 2017 04:03 AM PDT

So it's my (possibly inaccurate) understanding that freckles are a result of a certain cluster of cells producing more melanin and appearing darker than the rest of your skin cells. So wouldn't you eventually shed all the dark cells that composed a freckle, or new cells that you produced could mutate to be darker?

As someone who has had the same trademark nose freckle all their life, I know this to be untrue, but why???

submitted by /u/jellybones01
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Why will a RH- mother with a RH+ fetus will have issues, and not a RH- fetus and a RH+ mother?

Posted: 19 May 2017 04:22 PM PDT

Their blood mixes together, so can't the fetus create antibodies for the mother's foreign blood?

submitted by /u/tommyzat
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If I have a description of a time-symmetric continous system (say, a set of random differential equations or a cellular automaton or something), how exactly would I get a formula for the conserved quantity as per Noether's Theorem?

Posted: 19 May 2017 11:12 PM PDT

Why isn't there a 50% chance for 3 flipped coins to all land on the same side?

Posted: 19 May 2017 05:01 PM PDT

I know this might seem like a dumb question, but here's my logic;

'When you flip 3 coins, at least 2 of them are guaranteed to land on the same side, so surely the other coin has a 50% chance of landing on the same side as the other two.'

Now, we can tell from flipping 3 coins several times, that this is probably an incorrect assumption. What I want know is, what is the error in my logic?

submitted by /u/smearglexd
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If it were possible to stably break an atom apart into its fundamental parts, could we hypothetically put the existing particles back together into new atoms?

Posted: 19 May 2017 09:38 AM PDT

For example, take Helium 4 with 2 protons and 2 neutrons. If we broke that apart into its individual components, could we piece it back together into 2 atoms of deuterium?

submitted by /u/Topicu
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If I attempted to hang myself from the ceiling of an elevator using a belt and it began to free-fall ... would there be slack in the belt?

Posted: 19 May 2017 11:39 AM PDT

Can you get better at working with less sleep by training/practicing? i.e. Is there any long term adaptation to chronic sleep restriction?

Posted: 19 May 2017 07:16 AM PDT

Obviously, mental and physical performance will decline during the first few days of sleep restriction. Eventually, presumably after a few weeks, performance will cease to decline and stabilize at a minimum.

The key question is: if you sustain this sleep restriction for a longer period of time (months to years), will performance ever increase above this minimum? and by how much? Is it possible to regain baseline performance if you limit sleep restriction to a small level?

So for example, if you reduced your sleep time from a normal 8 hours to 7 hours for a period of a year, can you regain the same mental performance as before? If you go from 8 to 5 hours, can you perform as if you've only lost an hour of sleep?

Effectively, you would be practicing working in a sleep deprived state, presumably adapting your mind and body in the hope of reducing or eliminating the effects of sleep restriction.

submitted by /u/elsjpq
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[Quantum Mechanics] Don't wave functions that can't be normalized contradict the possibility of an infinite universe?

Posted: 19 May 2017 12:31 PM PDT

The simplest case is a constant potential. We get that the wave function is proportional to exp[ikx] (and exp[-ikx]), so the square of its absolute value is constant, i.e. uniform distribution. But a uniform distribution is impossible in an infinite universe, as it can't be normalized. Doesn't that contradict an infinite universe?

submitted by /u/yarinch
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Is it possible to be shocked by an organisms spinal cord?

Posted: 19 May 2017 11:45 AM PDT

I was talking to my dad earlier and he told me that one time he caught a catfish and gutted it, etc. Eventually, he grabbed its spinal cord and was shocked. I'm assuming this has everything to do with the nervous system of the fish but not exactly sure how it would shock my dad?

submitted by /u/StudentBill
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Could 90-proof (95% ABV) Ethanol dissolve plastic?

Posted: 19 May 2017 10:25 PM PDT

If so how long would it take to dissolve threw a plastic bottle?

submitted by /u/PM_UR_ARMPITS
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