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Friday, February 9, 2018

When octopus/squid/cuttlefish are out of the water in some videos, are they in pain from the air? Or does their skin keep them safe for a prolonged time? Is it closer to amphibian skin than fish skin?

When octopus/squid/cuttlefish are out of the water in some videos, are they in pain from the air? Or does their skin keep them safe for a prolonged time? Is it closer to amphibian skin than fish skin?

When octopus/squid/cuttlefish are out of the water in some videos, are they in pain from the air? Or does their skin keep them safe for a prolonged time? Is it closer to amphibian skin than fish skin?

Posted: 08 Feb 2018 08:40 AM PST

Does the size of electromagnetic waves in the visible light spectrum make it impossible to focus a conventional microscope on things close to or smaller than the wave's magnitude?

Posted: 08 Feb 2018 10:50 PM PST

Sorry for the odd phrasing but I dont know a more succint way of putting it.

submitted by /u/fireflambe
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Can anyone tell me why was uranium so light Dimitri Mendeleev periodic table?

Posted: 09 Feb 2018 01:36 AM PST

I was reading this article. The article stated that the atomic weight of uranium in Dimitri's periodic table is about half of what we know. I was wondering why?

submitted by /u/xxOskanxx
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Other than radiation, fusion, and fission, are there any natural processes which alter atoms from one element to another? [Chemistry]

Posted: 08 Feb 2018 10:58 PM PST

Does a binary star system have interacting Goldilocks zones?

Posted: 08 Feb 2018 04:23 PM PST

Do binary stars have individual planet systems, or do the two share one? Would a binary star system have any advantages or disadvantages in terms of potential life formation in the "Goldilocks" zone?

submitted by /u/JOHANSENATOR
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Is USB charging more battery friendly than charging with AC charger?

Posted: 09 Feb 2018 06:12 AM PST

I've seen it mentioned a couple of times here and there, that when you charge your device with a USB cable (connected to your computer), the battery will get less hot than when you charge it with an AC charger, which affects the battery life. Is that true and doesn't that mean that fast chargers are actually bad for your battery on the long run?

submitted by /u/igai_
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Considering surface tension, how do <1 cm insects consume water safely?

Posted: 08 Feb 2018 09:28 AM PST

Did dinosaurs shed their skin like modern reptiles?

Posted: 09 Feb 2018 01:39 AM PST

How exactly does fluticasone nasal spray work?

Posted: 08 Feb 2018 09:14 PM PST

The stuff immediately makes my allergy symptoms go away. I know it's a corticosteroid but I can't find an actual breakdown of what it's doing once inhaled.

submitted by /u/raychullzz
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If hair is made out of keratin (protein), why does heat-curled hair go back to normal after you wash it? What is it about the water that helps hair go back to normal, and why is the protein in hair not permanently denatured?

Posted: 08 Feb 2018 04:36 PM PST

How is a rocket able to lift itself off the Earth and escape gravity if total energy is conserved?

Posted: 09 Feb 2018 06:52 AM PST

Why is elastin elastic?

Posted: 08 Feb 2018 10:43 PM PST

Why does the falcon 9 heaven rocket have a mist coming over it at launch?

Posted: 09 Feb 2018 12:44 AM PST

If you dig straight down, do the rocks age with depth?

Posted: 08 Feb 2018 04:30 PM PST

Say if you have a vast mineshaft. Are the rocks at the very bottom as old as the Earth itself? Do the rocks become younger as your tunnel upwards?

submitted by /u/NippPop
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Are there clues in the geologic record as to when chunks of subducted tectonic plates have snapped relatively clean from the parent plate?

Posted: 08 Feb 2018 08:01 PM PST

Like large crustal upheavals, rebounds, something like the Great Unconformity being representative of this type of event? I'm wondering what magnitude of earthquake could occur in a region where a few hundred miles of a tectonic plate might have broken off in successive events that caused widespread "really big ones" generated from far deeper than those relatively close to the surface.

submitted by /u/screwyoutoo
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Why does your nose get runny when you’re outside in the cold for a long time?

Posted: 08 Feb 2018 10:27 AM PST

How does the development of two umbilical cords(and placentas?) work when the body triggers twins versus one child?

Posted: 08 Feb 2018 07:23 PM PST

How are plants selectively bred/grown?

Posted: 08 Feb 2018 07:21 PM PST

I've heard from many times that plants and produce like the Carolina Reaper are "invented" or selectively bred. I understand how this can occur when breeding animals, but how on earth can you do this with plants?

And in theory, if somebody wanted to, could they make apples as sour as something like sour skittles? What are the limitations, if any, to what can be bred?

submitted by /u/gameratwork666
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Would it be possible to independently determine what 1 volt is without a frame of reference?

Posted: 08 Feb 2018 05:00 PM PST

I was thinking about all those 'you get sent back into the past with your phone and...' posts, and making a simple water wheel powered generator is easy enough to recharge it, relatively speaking, but how would you regulate it to +5v DC? I did a quick glance of Wikipedia and it seems to not be something that can even be easily approximated, like 'one Mississippi' for a second. So, basically, how would you be able to verify the voltage of a generator without a frame of reference since the volt was historically defined comparatively?
On an unrelated note, I like how the automod removes posts without a question mark, then the timer prevents you from resubmitting it after you are notified

submitted by /u/TheGreatNico
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If you build a higher tolerance to alcohol does this mean it takes more alcohol to get the same BAC or just more alcohol to get the same effects?

Posted: 08 Feb 2018 04:35 PM PST
vào lúc No comments:

Thursday, February 8, 2018

There's no sound in a vacuum because sounds are vibrations in the air, and in a vacuum there is no air to vibrate. So where does the energy that would go into vibrating the air particles go instead?

There's no sound in a vacuum because sounds are vibrations in the air, and in a vacuum there is no air to vibrate. So where does the energy that would go into vibrating the air particles go instead?

There's no sound in a vacuum because sounds are vibrations in the air, and in a vacuum there is no air to vibrate. So where does the energy that would go into vibrating the air particles go instead?

Posted: 07 Feb 2018 01:52 PM PST

If salt is Sodium Cloride, then what is "low sodium salt"? Is it just a marketing term or is there more?

Posted: 08 Feb 2018 02:08 AM PST

Where does heat go in space?

Posted: 08 Feb 2018 06:14 AM PST

Imagine you had a bottle of water (somehow not exploding in a vacuum), would it cool down after a while? and if so, how does it lose its heat?

submitted by /u/Sam1122334
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How does a remote island get grass and vegetation when it first forms? Or soil for that matter?

Posted: 08 Feb 2018 05:27 AM PST

Why does vomiting relieve nausea even when the nausea is not caused by something in your digestive tract?

Posted: 07 Feb 2018 10:32 PM PST

For example, nausea caused by drug use via insufflation or unsettling images.

submitted by /u/BrotherDBAD
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How exactly does injecting poultry with powerful antibiotics like Colistin affect the general population's resistance to infections?

Posted: 08 Feb 2018 12:03 AM PST

I'd read an alarming article wherein Colistin is heavily injected into Indian chickens and the implications of such practices. I was wondering how is the resistance to these medicines formed actually? Will those affected by this include people who don't eat these chickens as well?

Link to article: http://www.independent.co.uk/environment/farmers-chickens-antibiotic-boost-weight-colistin-farm-animals-infections-a8191521.html

submitted by /u/only_says_mehh
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How can amino acid supplements claim to have 7g protein and yet 0 calories?

Posted: 07 Feb 2018 11:31 PM PST

Why do crystal meth abusers usually end up having vision problems?

Posted: 07 Feb 2018 11:33 PM PST

Ex: lazy eye, one eye has changed from original color, saggy eye

submitted by /u/geminiwitch77
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How does brain differentiate between factual vs fictitious memories ?

Posted: 07 Feb 2018 06:14 PM PST

How much of the energy that goes into a PC is transformed into heat? How does it compare to a space heater?

Posted: 08 Feb 2018 01:37 AM PST

I've just asked myself this since my old PC tower does warm up my room when it's on and after all, both a space heater and a computer produce heat by sending electricity through wiring, right? The computer's is just more intricate ... I was also wondering if this would make a computer doing calculations (CERN, folding proteins, cryptocurrency, ...) an efficient replacement for a space heater on either an individual or humanity-wide level.

submitted by /u/Casual_Wizard
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What exactly does it mean to "lock" your legs and why does it cause people to faint or pass out while standing?

Posted: 07 Feb 2018 07:14 PM PST

Is it possible for an egg cell to experience nondisjunction of every chromosome, and if so, would it lead to a virgin birth?

Posted: 08 Feb 2018 03:01 AM PST

I was curious about this because of the recent NYTimes article about a species of mutant crawfish which is only female because it can clone itself through total nondisjunction in its eggs, creating clones of itself endlessly. Can such a thing happen in any species, and especially in humans? If it's possible, even if unlikely, would it lead to a virgin birth, as with the crawfish population?

submitted by /u/CodeReaper
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I know the basics of how grid fins work, but why are grid fins built with diagonal lattices instead of square lattices? What is the optimum depth for grid fins?

Posted: 07 Feb 2018 06:48 PM PST

Grid fins, the big flat grids on the sides of some missiles and rockets, are used to redirect the path of air by forcing air through square "tubes" in the grid fin.

I have some inquiries about the specifics of the shape of the grid fins.

  1. How deep should a grid fin be? If a grid fin is too shallow, there's less air correction, I assume. But what would make a grid fin too deep? Or is there no such thing as too deep when talking about grid fins?

  2. Why do grid fins use diagonal lattice grids opposed to square lattice grids? What exactly makes it more efficient?

Thanks for reading my post, I would attach a link or image but I can't in this subreddit, but I'm pretty sure my post works with all grid fins.

EDIT: I would put both engineering and physics as the flairs, but it seems like I can't do that.

submitted by /u/purpleprick
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What is the difference between all the weather models?

Posted: 08 Feb 2018 01:00 AM PST

Low-level clouds aee huge masses of condensed water vapor. High-level clouds are ice particles. When/at what temperature does this change occur?

Posted: 08 Feb 2018 12:58 AM PST

As a follow-up, is the sun's heat above the clouds make it warm enough to melt back into water vapor and condense, or does it just stay like that until it melts in atmospheric heat?

submitted by /u/GusBaur124
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What causes caffeine to make you urinate more frequently?

Posted: 08 Feb 2018 06:56 AM PST

So the solar system is revolving around SgrA* ...are we getting any closer to it or we are just revolving on a fixed orbit?

Posted: 08 Feb 2018 06:41 AM PST

Also I don't get how do you prove that black holes are real using maths ..

submitted by /u/EssamWisam
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Does smooth muscle activity help maintain body temperature?

Posted: 07 Feb 2018 07:36 PM PST

Does smooth muscle activity help maintain body temperature? If so how much compared to skeletal muscle or other ways of producing heat in the body? There was an unresolved discussion in class and I'm curious how much smooth muscle helps.

submitted by /u/ender1824
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How are manufacturers able to know the expiry date of their products?

Posted: 08 Feb 2018 06:07 AM PST

why don’t bugs take fall damage when u whack them off stuff?

Posted: 08 Feb 2018 01:20 AM PST

Why does the center of the earth never run out of heat?

Posted: 07 Feb 2018 07:42 PM PST

Why does meat change colour as it cooks?

Posted: 07 Feb 2018 06:08 PM PST
vào lúc No comments:

Wednesday, February 7, 2018

As someone gets more obese, do their actual skin cells stretch or do they replicate fast enough to keep up with the increasing surface area?

As someone gets more obese, do their actual skin cells stretch or do they replicate fast enough to keep up with the increasing surface area?

As someone gets more obese, do their actual skin cells stretch or do they replicate fast enough to keep up with the increasing surface area?

Posted: 07 Feb 2018 02:58 AM PST

A follow up question would be:

If the cells stretch more than they replicate, does this mean that there is a lower concentration of nerve endings? Would stretched skin around large fat deposits be less sensitive to touch?

submitted by /u/Husibrap
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If iron loses it's magnetism around 800 degrees C, how can the earth's core, at ~6000 degrees C, be magnetic?

Posted: 06 Feb 2018 07:39 AM PST

Can artificial intelligence help with sustaining nuclear fusion?

Posted: 07 Feb 2018 04:03 AM PST

The way I understand it, the main challenge to sustainable nuclear fusion is the confinement of plasma within the reactor. The approach to doing this currently is to use fixed magnetic fields to confine the plasma into a certain shape (for example: toroid in a tokamak reactor). The issue is that sometimes, plasma still manages to escape this shape, and therefore fusion is broken. Here's my question, wouldn't it make more sense to use deep learning technology to train a program to monitor the plasma inside the reactor at different points and then alter the strength of the magnetic fields being emitted accordingly so that it results in the plasma staying in the shape we want for sustained fusion?

submitted by /u/pknofal
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How are wind turbines accelerated from rest? Purely from wind or are they jump-started?

Posted: 07 Feb 2018 05:35 AM PST

Do they need a motor to get them accelerated to a reasonable rpm or is their movement purely dependent on the wind?

submitted by /u/kingoldmaster
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SpaceX Falcon Heavy Launch Megathread

Posted: 06 Feb 2018 06:48 PM PST

There are a lot of questions about the launch of the Falcon Heavy Demonstration Mission on February 6, 2018 and its payload, the Tesla Roadster. We have a number of engineers, physicists, and astronomers here to help answer your questions!

submitted by /u/AskScienceModerator
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Will UHVDC power lines keep increasing in voltage?

Posted: 07 Feb 2018 06:09 AM PST

In the 50s Russia had a 100 kV line, China built a 1100 kV line in 2016. Will 2100 have a 10,000 kV project?

I wondered if anyone had an idea if there are theoretical limits or cost projections saying if this trend will continue.

submitted by /u/BernieMeinhoffGang
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How is our brain able to pinpoint specific voices in crowds and then focus in on what they're saying?

Posted: 06 Feb 2018 06:05 PM PST

Life expectancy with Down Syndrome was just ~24 years as recently as 1985. Now it's 60+. What advances are most responsible for this?

Posted: 06 Feb 2018 12:05 PM PST

Was there some specific problem that was solved, or was it just a cumulative effect from a lot of little fixes?

What is still causing the remaining gap between the life expectancy of someone with Down Syndrome and the 75+ years of someone without?

submitted by /u/N64_Chalmers
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The overuse of antibiotics has lead to the development of antibiotic resistant "Superbugs". How much of this phenomenon is due to industrial agriculture and how much of it is due to misuse of antibiotics in healthcare?

Posted: 06 Feb 2018 06:09 PM PST

How does our immune system know not to attack gut flora like it would a bacterial infection?

Posted: 06 Feb 2018 09:36 PM PST

If a probe was sent to drill into the ice of Europa to search for life, couldn't even a single microbe potentially introduce life to the planet or threaten their biosphere? Can we render a probe truly, truly sterile and if so how can such be done?

Posted: 06 Feb 2018 08:08 PM PST

Getting 99.99% of microbes seems viable and for purposes on Earth that is usually enough but do we have the capacity to get EVERY last microbe and if so, how?

submitted by /u/JohnnyFiveOhAlive
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Why does something straight, like ribbon or hair, curl when you drag scissors along its surface?

Posted: 06 Feb 2018 04:58 PM PST

If we are filling space with space junk, will there come a time when there is too much in space to send anything up because of collision risk? If so, is there a way to clean up all the junk?

Posted: 06 Feb 2018 11:21 PM PST

If the salt water in the ocean accumulated over time was there ever a point where it was all freshwater?

Posted: 06 Feb 2018 11:42 PM PST

Ask Anything Wednesday - Physics, Astronomy, Earth and Planetary Science

Posted: 07 Feb 2018 07:07 AM PST

Welcome to our weekly feature, Ask Anything Wednesday - this week we are focusing on Physics, Astronomy, Earth and Planetary Science

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
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What makes an orange orange?

Posted: 06 Feb 2018 06:53 PM PST

What happens to the mass of an irradiated brain tumor?

Posted: 06 Feb 2018 06:13 PM PST

I understand that radiation stops mitosis, so the tumor no longer grows. What happens to the tumor's tissue after radiation treatment? Is it considered "dead"? Does it shrink? Can it be re-absorbed?

submitted by /u/chunkmcrunfast
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Why can a person live with one lung, but die from a unilateral pulmonary embolism?

Posted: 06 Feb 2018 06:13 PM PST

Just studying about DVT's and PE's and was wondering. Is it because the PE puts you into right ventricular heart failure? Thanks! Edit: Punctuation.

submitted by /u/NotAMedic720
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Is there enough atmosphere to hear music playing on Mars?

Posted: 06 Feb 2018 02:35 PM PST

At what temperature do Bose-Einstein Condensates and other exotic states of matter exist?

Posted: 06 Feb 2018 11:57 PM PST

All I can seem to find is that "Bose-Einstein Condensates exist in very low temperatures whilst plasma and quark-gluon plasma exists at very high temperatures." Does anyone know exact temperatures that these states of matter exist? For example, does a BEC only occur in temperatures ranging 1 – 10 kelvin or 1 – 10 nanokelvins? What order of magnitude of temperature (i.e. 10,000 K, 100,000 K — not too sure if I'm using the right terminology here) would plasma or quark-gluon plasma exist? Thanks!

submitted by /u/HaythamJubilee
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Since the speed of light is the maximum speed anything can reach, does that mean the amount of energy any mass can have is finite?

Posted: 06 Feb 2018 03:01 PM PST

To further explain my question, we know that all matter contains some form of energy. Since the limit of how fast anything can move is the speed of light, does that mean that there is an actual finite number of energy that any mass can reach? If something were to move at the speed of light, the energy of the system can be calculated easily using formulas we know, but it only translate into energy from movement if I remember correctly. For example, if a mass were to travel at the speed of light, let's say it has 1000 joules. Can the system have more than 1000 joules? Seeing as how a system can have energy beyond kinetic, it should be able to have more than 1000 joules, because that only quantifies the kinetic portion of the system. However, is this true? If the system holds more energy, would that not translate into movement? From my understanding, almost all energy has to do with movement. For example, temperature could be explained as the movement/vibrations of matter. The hotter it is the more motion the particles have, which is why objects at absolute zero don't have any motion (0 energy). Or at least that's what I think, but I would really like an answer to this question.

Thanks

submitted by /u/Parkadons
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Is it possible with unlimited fuel to reach the speed of light in space? Or is there a maximum speed that can be reached?

Posted: 06 Feb 2018 04:56 PM PST
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