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Saturday, May 28, 2016

Whats the difference between moving your arm, and thinking about moving your arm? How does your body differentiate the two?

Whats the difference between moving your arm, and thinking about moving your arm? How does your body differentiate the two?


Whats the difference between moving your arm, and thinking about moving your arm? How does your body differentiate the two?

Posted: 27 May 2016 08:08 PM PDT

I was lying in bed and this is all I can think about.

Tagged as neuro because I think it is? I honestly have no clue if its neuro or bio.

submitted by /u/YeOlePiratePenguin
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Why is the bottom of the ocean so cold? With all that pressure, shouldn't it be ridiculously hot?

Posted: 27 May 2016 08:28 PM PDT

I was watching an Attenborough doco about creatures of the deep, and he mentioned that water temperatures drop drastically as you go deeper. That seems inconsistent with the drastic increase in pressure as you go deeper. This is all coming from my 1st year uni understanding of PV = nRT. My guess would be something like: warm water rises, cool water falls, you end up with a continuous cycle (like vertical currents) that regulates water temperatures even very deep in the ocean.

submitted by /u/flashaaahhaaahh
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Quantity of soap required to affect a given amount of oil?

Posted: 28 May 2016 04:52 AM PDT

I have a basic understanding that soap affects oils by trapping them in water-soluble structures called micelles, which can be washed away by water. But how much soap is required for a given amount of oil?

submitted by /u/chocolatedessert
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When the Falcon 9 reenters the atmosphere for landing, why doesn't seem to need a heat shield?

Posted: 28 May 2016 05:37 AM PDT

Every craft in my memory seems to need a heat shield but here (https://www.youtube.com/watch?v=4jEz03Z8azc&feature=youtu.be) it seems to reenter without a problem. Is it going slower than capsules or shuttles would normally go, or is it returning at a different angle to reduce drag from the increasing air?

submitted by /u/steveZISSOU22
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If you could measure the distance from a singularity to the inner edge of a black holes horizon would it be infinite because of space stretching or would it have a set distance?

Posted: 27 May 2016 07:40 PM PDT

Basically I was thinking if the singularity of a black hole hit some unknown degeneracy limit and started pushing back outwards how much space could the singularity expand into? I know for all intents and purposes the inner workings of a black hole are basically separate from our universe, but I was wondering if anyone knew anything about this.

submitted by /u/pwnangel
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Why doesn't light diffract through the 'mostly empty space' of an atom?

Posted: 27 May 2016 07:36 PM PDT

In this case, the 'the slit' is small enough for significant diffraction, right?

submitted by /u/pearone
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What makes rubber bands "dry out" (become brittle)? Is there a way to make them last longer?

Posted: 27 May 2016 12:37 PM PDT

Why isn't acetaminophen (e.g. Tylenol) formulated with N-acetylcysteine?

Posted: 27 May 2016 08:30 PM PDT

Paracetamol toxicity seems to be a very significant public health issue--lots of overdoses leading to deaths and liver transplants.

N-acetylcysteine (NAC), used as an early "antidote" for acute toxicity, is seemingly well-tolerated, cheap, and minimally interactive with other compounds (including paracetamol itself). The MoA appears to imply that concomitant administration could effectively prevent toxicity from ever happening.

So why aren't paracetamol formulations--particularly "prescription strength," high-dosage ones--commonly made with included NAC? It seems like a very straightforward way to make paracetamol safer, but there must be a good reason that this doesn't happen.

Thanks!

submitted by /u/Nyrin
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Why don't fingerprints change if skin sheds constantly?

Posted: 27 May 2016 04:18 PM PDT

Maybe this is silly, but I had a surgical incision on my thumb recently to get rid of a felon, and the skin on the entire top part of my thumb is shedding.

Why doesn't my fingerprint change on my thumb?

submitted by /u/aimeecuevas
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How does a cell's size affect the rate at which it ages?

Posted: 28 May 2016 05:12 AM PDT

e.g. accumulates misfolded proteins

submitted by /u/inquilinekea
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Do automobiles go from 60 to 120 slower/faster than they do 0 to 60?

Posted: 27 May 2016 02:48 PM PDT

What is the general consensus of counseling psychologists, on the use of hypnotherapy as an effective method of treatment?

Posted: 27 May 2016 02:10 PM PDT

Complete quackery or a viable option for treatment?

submitted by /u/Shredder1219
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What determines the frequency and duration of a thunder?

Posted: 27 May 2016 01:28 PM PDT

It's pretty self-explanatory. Thanks!

submitted by /u/Katie_Deely
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How is a mercury based ferrofluid made?

Posted: 27 May 2016 07:59 PM PDT

In devices that require multiple batteries (like say, an xbox controller) do both batteries lose same amount of charge over time? What would the battery-life expectancy be if I changed only one battery, when both old ones are dead?

Posted: 27 May 2016 11:36 AM PDT

Since fruits and vegetables can be grown anytime in a greenhouse, do they taste better when they're in season?

Posted: 27 May 2016 04:45 PM PDT

I don't buy out-of-season fruits at the store because I don't think they taste as good. My husband doesn't think my logic stand.

submitted by /u/slowlyretarding
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What happens to a star to close to a supernova?

Posted: 27 May 2016 01:48 PM PDT

Are there known tidal effects on other planets?

Posted: 27 May 2016 03:25 PM PDT

Are there any reactive materials that would have useful applications if not for our oxygen-rich atmosphere?

Posted: 27 May 2016 12:03 PM PDT

There are a lot of elements/compounds that react (sometimes violently) to the oxygen (or water?) in our atmosphere. Are there any that would be extremely useful in everyday applications if it weren't for their reactivity with common substances and ubiquitous gasses?

submitted by /u/Grava-T
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During internal bleeding where does the blood leak to?

Posted: 27 May 2016 02:09 PM PDT

I was always under the impression that blood vessels where more or less packed in surrounded by muscles and organs which wouldn't really leave much room for blood to pool into even if a vessel was ruptured.

submitted by /u/brickmaster32000
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Would we know if a distant galaxy was made up of anti-matter?

Posted: 27 May 2016 12:43 PM PDT

Would there be a difference in the light or radio signals or anything? Could there be huge amounts of anti-matter that looks just like matter?

submitted by /u/FondOfDrinknIndustry
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What makes highly acidic and alkaline solutions so corrosive?

Posted: 27 May 2016 01:24 PM PDT

What is the difference between "sun" and "shade" plants?

Posted: 27 May 2016 04:49 PM PDT

Kind of a dumb question, but why is it that some plants do better in shade than in sun, or with less light in general? I can see where some plants would be better adapted to lower light conditions, but it seems to me that as photo synthesizers most plants would be happy getting plenty of sun. Thanks for your help!

submitted by /u/Kharybdis97
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Friday, May 27, 2016

Difference between different types of Amorphous solids?

Difference between different types of Amorphous solids?


Difference between different types of Amorphous solids?

Posted: 27 May 2016 12:58 AM PDT

So I'm doing a research task about glass, its properties, structure, production, and economic impact, but am having a problem finding a distinct difference in definition between a plastic and a glass. Both are amorphous solids, right? Both undergo a glass transition phase, right? Like plastics don't melt, but rather get softer and harder with or without temperature, and so does glass, so what is the difference by definition?

I read that all glass are amorphous solids, but not all amorphous solids are glass. Please explain how this is so, thankyou :)

submitted by /u/Racist_Zebraa
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Why do many materials, such as rock and wood, appear darker when wet?

Posted: 27 May 2016 06:44 AM PDT

While at the same time, materials like metal don't appear darker when wet.

submitted by /u/Germy_Widemirror
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Is it possible to improve one's vision without glasses or surgery?

Posted: 26 May 2016 06:34 PM PDT

If I were to stand in the middle of a completely sealed, spherical mirror with a light bulb in the middle, would the light build up to blinding levels, or just remain as bright as the bulb?

Posted: 26 May 2016 05:08 PM PDT

Title basically says it all, but I imagine if you have a box full of bouncy balls, and you keep throwing them in there with infinite energy, adding more and more would increase the density of the balls in the box, so would the same thing happen with light?

submitted by /u/ioswarrior67
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Does the human eye see in frames per second?

Posted: 26 May 2016 06:29 PM PDT

Why don't waves through water travel at the speed of sound in water?

Posted: 26 May 2016 06:32 PM PDT

Okay so in materials I know that most acoustic (and optical as far as I know) waves will travel through the material at the speed of sound in that material (i.e. tapping on one end of a metal bar and seeing the response at the other end) but there are examples of things that display "wave-like" properties that do not follow this rule. These examples could be releasing a spring (especially with a low spring constant) and water traveling in waves. So I am just wondering what causes this difference and why these phenomena are observed?

My thinking, for the spring example at least, would be that the waves do travel through the spring or slinky at the speed of sound in the respective material but the overall response from the material happens over many waves with a slightly (atomically) larger response in one direction than the other with each wave?

submitted by /u/ishya_boi
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Couldn't the cane toad problem in Australia be solved by genetically modifying a few to have a dominant gene that makes the toad's toxin harmless to other Australian wild life?

Posted: 27 May 2016 04:29 AM PDT

The cane toad is a big problem in Australia. There are no predators in Australia that can withstand it's toxin. Introducing an other foreign species is not an option, it's what got them in trouble in the first place. Getting rid of them by hand is fighting a losing battle, it creates just more space for more toads to reproduce.

So couldn't problem be solved by genetically modifying a few to have a dominant gene that makes the toad's toxin harmless to other Australian wild life?

submitted by /u/Albert_VDS
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What's the difference between ADHD and depression if both are cause by low levels of dopamine/serotonin?

Posted: 27 May 2016 12:36 AM PDT

Are there any plants that aren't evergreen trees that continue to photosynthesize, flower, and reproduce year round? If not, why not?

Posted: 26 May 2016 06:32 PM PDT

When did climate change enter the public discourse?

Posted: 27 May 2016 03:51 AM PDT

As I understand it, in the 1960s the idea was basically born that human action was having an effect on the environment, in the 1970s a lot of scientists thought the problem was global cooling and a lot of people used that to discredit climate change. In the 1980s it was considered a fringe conspiracy theory. When did it begin to gain credibility in the scientific community and with the public?

submitted by /u/Adamj1
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How is "true north" defined, and where is it located?

Posted: 26 May 2016 03:40 PM PDT

After learning that magnetic north and true north were two different locations, I was curious to find out where true north actually is. I assumed it was at 90 degrees latitude; however now I find out that's not the case. Wikipedia and the UK Ordinance Servery say that Grid North, which I assume is defined at 90 degrees latitude, is different than true north. If so, then what is true north? What defines it? Why does true north not line up with our map grid lines, and why have our maps not been changed to fit true north? What purpose does true north have?

submitted by /u/ChemicalExperiment
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How much neutron star material is required for its own gravity to be sufficient to maintain its density? Would a basketball-sized sphere of so-called "neutronium" be stable? Mountain-sized?

Posted: 26 May 2016 11:31 AM PDT

In TIL today there's a post about how a teaspoon of neutron star material weigh 10 billion tons due to its density.

If one were to take that 1 tsp. of neutron star material and place it in interstellar space would it's own gravity be sufficient to maintain its density and remain a teaspoon-sized, 10 billion ton mass or would it revert to 10 billion tons of normal matter with a reasonable density? If it isn't, would a basketball-sized sphere of neutron star material be heavy enough to maintain its stability? How about a mountain-sized sphere?

Put another way, what would be the minimum mass of a sphere of neutron star material needed in order for that object to remain as dense as it would if it were on the surface of a neutron star?

Once we've established how large that sphere is, how far would we have to be from it to experience 1g (9.8m/s2) of acceleration towards it? How about 0.1g acceleration since I don't want to become neutron star material by being drawn in to it and converted into degenerate matter?

Disclosure: I'm not writing a (sci-fi) story nor solving a problem for a class. I have, however, read many stories with neutron stars being part of the plot so I'm curious about their properties as explained by actually physicists/scientists as opposed to clever sci-fi writers who may not have the latest information.

submitted by /u/Amoyamoyamoya
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How hot would it become inside a Dyson shell?

Posted: 27 May 2016 02:56 AM PDT

Seeing how much radiation the sun is emiting, I imagine it would be quite hot. Also would the earth be liveable if the radius is 1 AU? Thanks in advance!

submitted by /u/VitalDragon
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I know of the competence-deviance hypothesis. Is there a corollary: the incompetence-tolerance hypothesis?

Posted: 26 May 2016 09:47 PM PDT

I sound like an un-fun elitist, but I spend my time with adolescents, some of their relationships confuse me. I think this extends to most people I know, machines, media, games, and so on. Think about it.

submitted by /u/eightpix
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How large would an object in low earth orbit need to be, to be visible to the naked eye from earths surface?

Posted: 26 May 2016 10:26 AM PDT

More noticeable than a star but not taking up a grand section.

submitted by /u/46620
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How is energy conserved when light is red shifted from the expansion of the universe?

Posted: 26 May 2016 03:39 PM PDT

My understanding is that the longer the wavelength of light the lower the energy of the wave. So how can energy be conserved as the light loses energy but the energy is not transferred to anything else?

submitted by /u/12jake
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Why are the different drops in this "oil spill" different colors?

Posted: 26 May 2016 03:57 PM PDT

http://imgur.com/bxEl5Ca

with enhanced color: http://i.imgur.com/UYuZxZO.jpg

Post from /r/mildlyinteresting

I understand how iridescence and refraction work more or less with different wavelengths bouncing at different angles, but why are different pieces of what I assume are the same material showing such differences in appearance?

according to OP: "In the parking lot it was in, it could literally be any fluid in any quantity that goes into a car."

submitted by /u/self_driving_sanders
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Could there be a loud sound so short in duration (billionths of a second) that our brains can't process it's existence?

Posted: 26 May 2016 09:52 PM PDT

I know our ears can only pick up a range of frequencies and decibel levels, but say there was an cataclysmic sound that happened in a millionth of a second, would human ears or brain be able to detect it? and is there a certain duration threshold that would make a sound like that audible or not?

submitted by /u/industrial86
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how do we know constants like the speed of light aren't different in far away parts of the universe?

Posted: 26 May 2016 08:43 AM PDT

Is it that whole 'the Earth isn't special' thing? Is there any way to scientifically prove that?

submitted by /u/jelly_burger
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Are there any known diseases caused by mutations in our DNA that happen post birth?

Posted: 26 May 2016 04:21 PM PDT

I know there are disease from mutations inherited from parents (like sickle cell). It seems many diseases are environmental and not genetic. Considering mutations in our DNA accumulate as we age, are there any known ailments or diseases (or research into this subject) that can be caused by damage to our DNA that occured post birth?

Sorry if my terminology is off.

submitted by /u/BanalPlay
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Thursday, May 26, 2016

A month ago we made available publicly via the CERN Open Data Portal 300 TB of research data from the CMS Experiment at CERN’s Large Hadron Collider. AUA about our open data!

A month ago we made available publicly via the CERN Open Data Portal 300 TB of research data from the CMS Experiment at CERN’s Large Hadron Collider. AUA about our open data!


A month ago we made available publicly via the CERN Open Data Portal 300 TB of research data from the CMS Experiment at CERN’s Large Hadron Collider. AUA about our open data!

Posted: 26 May 2016 05:00 AM PDT

Hi /r/AskScience!

As the title of the /r/technology post said, we dropped 300 Terabytes of LHC data to the internet a month ago via the CERN Open Data Portal. The data, from the Compact Muon Solenoid (CMS) Experiment, are now in the public domain under the CC0 waiver. The datasets include over 100 TB of data from proton collisions at 7 TeV, making up half the data collected by the CMS detector in 2011. The data are provided in the format that is used by CMS scientists for performing physics analyses. We have also provided 200 TB of simulated data (Monte Carlo) generated with the same software version that should be used to analyse the primary datasets. Read more about the data release.

A year and a half ago, when we first launched the CERN Open Data Portal, we conducted an AMA about the first release of open data on the portal and about open science in general. Today, we want to talk to you not just about our motivations for making such large datasets available openly and the challenges involved in doing so, but also about how our data are being used for research as well as in education. We are:

  • From CERN Information Technology:
    • Tibor Simko (ts), Technology Lead for the Open Data Portal
  • From CERN Scientific Information Service:
    • Anxhela Dani (ad), Data librarian
  • From the CMS Experiment:
    • Kati Lassila-Perini (klp), Physicist and Co-ordinator of the CMS Data Preservation and Open Data project, Helsinki Institute of Physics
    • Tom McCauley (tpm), Physicist and Developer of CMS education/outreach tools, University of Notre Dame

We'll sign our posts with our initials (see above) so you know who said what. Just to be clear, we are speaking with you in our personal capacities and neither CERN nor our home institutes necessarily support the views expressed during the AMA. We are also joined by:

  • Achintya Rao (/u/RaoOfPhysics), CMS science communicator and Science Communication doctoral student

We'll answer your questions from 16:00 CEST until around 18:00 CEST (UTC+02).

Proof!

About the CERN Open Data Portal

The CERN Open Data portal is the access point to a growing range of data produced through the research performed at CERN. It disseminates the preserved output from various research activities, including accompanying software and documentation that is needed to understand and analyse the data being shared.

The portal adheres to established global standards in data preservation and Open Science: the products are shared under open licences; they are issued with a digital object identifier (DOI) to make them citable objects in the scientific discourse.

About CERN

CERN is the European Laboratory for Particle Physics, located in Geneva, Switzerland. Its flagship accelerator is the Large Hadron Collider (LHC), which has four main particle detectors: ALICE, ATLAS, CMS and LHCb.

For updates, news and more, head over to our unofficial home on reddit: /r/CERN!

CERN projects you can join

submitted by /u/askCERN
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How has life affected what the Earth looks like?

Posted: 25 May 2016 03:13 PM PDT

How has biological life affected what the Earth looks like?


If that's too broad a question I've got some specific ones below, and I'd love answers to any of them. Thanks for any interest in answering.

  • Is there more land because plant life prevents a lot of erosion from wind and rain?
  • Is there more soil and less gravel and sand?
  • Are there more beaches because of life?

  • How has the composition of the atmosphere and seas changed?
  • Are the colours different?
  • Obviously we have an oxygenated atmosphere now.
  • Without life would the weather be more or less extreme?
  • Would sea levels have changed?

  • Has life 'guarded' against any catastrophic run-away environmental processes, perhaps irreversibly transforming Earth to be more like Venus or Mars?

  • Is this a question useful for investigating potential planets suitable for extraterrestrial life?

Thanks again!

submitted by /u/aSemy
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Do objects orbiting close to black holes ever get flung out into space at near light speed?

Posted: 25 May 2016 01:35 PM PDT

If possible, could earth be pulverized at any time without warning by an asteroid flying through the solar system at .99c?

submitted by /u/turdferg123
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When talking to someone through two cups attached by a string, why do you hear their voice louder than just talking through air at the same distance?

Posted: 25 May 2016 10:52 PM PDT

Any formulas to help explain this would be awesome!

submitted by /u/BeastftMiddleEast
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How do computers/digitizer watches know how long a second is?

Posted: 26 May 2016 01:03 AM PDT

I assume computers/digital watches/stopwatches calculate time by "knowing" that there's 24 hrs in a day, 60 minutes to an hour, 60 seconds in a minute. If that's correct, how do those devices know how long a second is?

Edit: on mobile, can't fix autocorrect in title, meant to say digital watch not digitizer

submitted by /u/sir_wigalot
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Does the size of a ferromagnetic metal related to its magnetic strength?

Posted: 25 May 2016 08:26 PM PDT

If not, what factors explain magnetic strength? Also, are there any ferromagnetic elements that are magnetised by default (as in without requiring an applied voltage to make permanent) ?

submitted by /u/qwerty_face
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Can spacetime wrap in such a way that the universe would be finite with no border ?

Posted: 25 May 2016 11:54 AM PDT

Maybe something like a 4 dimensional sphere ?

submitted by /u/kugelbl1z
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What influences the size/morphology of magnetic domains and their boundaries in ferro/ferrimagnetic materials?

Posted: 25 May 2016 03:49 PM PDT

It is known that multiple magnetic domains can exist in a single crystalline grain of metal. In other words, if there exists a polycrystalline material with n grains, there can be >n magnetic domains, since each grain can have multiple magnetic domains.

What factors influence the creation of magnetic domains and their boundaries?

submitted by /u/DrIblis
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Does El Niño/La Niña impact the ITCZ?

Posted: 26 May 2016 06:22 AM PDT

I have a basic understanding of the role the ITCZ plays in the monsoon cycle, but I'm curious if a strong ENSO changes the behavior of the ITCZ - thus impacting monsoons.

submitted by /u/Dav1d0v
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Why can't alpha particles cause nuclear reactions like neutrons? Is it their size or the electrostatic interactions?

Posted: 26 May 2016 05:15 AM PDT

If an astronomical object was orbiting a brown dwarf, would it be classified as a planet, a moon or something else?

Posted: 25 May 2016 07:11 PM PDT

Title pretty much says it all, except I also wonder if this could even happen, as it seems like all brown dwarfs are rouge? (I could be mistaken.)

Thanks in advance!

submitted by /u/WaffleSingSong
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Why do most installers and software refer to 32 bit as "x86", yet 64 bit is still just "x64"?

Posted: 25 May 2016 04:51 PM PDT

Is there anything interesting about adding a "small cardinal axiom?"

Posted: 25 May 2016 06:36 PM PDT

I'm really not sure how to properly articulate this idea or if it is even meaningful, but ... we use the axiom of infinity to guarantee the existence of an infinite set with cardinality aleph-null, and we can use the power set operation to construct aleph cardinals greater than aleph-null. We can also add large cardinal axioms and reason about cardinalities strictly greater than all aleph cardinals, and that gets quite interesting mathematically.

What if we added something like a "small cardinal axiom" to axiomatically state the existence of a set where, say ... the cardinality of the power set of this set is aleph-null, so it must therefore have a transfinite cardinality that is strictly lesser than aleph null.

Or perhaps something more along the lines of constructing fractional or even infinitesimal cardinalities, axiomatically stating the existence of a set with cardinality strictly greater than zero and strictly lesser than one. Or even with a negative cardinality?

Is anything like these ideas possible without creating an inconsistent axiomatic system? If so, is there anything particularly interesting about such systems?

Thanks in advance for entertaining the idea!

submitted by /u/hikaruzero
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Do plastics ever become pourable with enough heat?

Posted: 25 May 2016 08:21 PM PDT

From what I can find, plastics such as HDPE require not only heat but pressure to take the form of a mould. Do heated plastics never reduce in viscosity to the point of becoming pourable?

submitted by /u/spaaaceotter
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Are there precious metals humanity relies on that we are in danger of running out of?

Posted: 25 May 2016 06:32 PM PDT

What's the difference between the different lobes of the brain?

Posted: 25 May 2016 10:31 PM PDT

I don't mean functionally, but physically, what at the fundamental level defines which part of the brain does what, isn't it all just a big mesh of neurons? How does the brain know that these neurons control movement and these my heart rate, and these vision? Is it just dependant on what they're connected to (like my heart or my eyes) but fundamentally they're identical?

submitted by /u/palalapa
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Does fracking definitively cause earthquakes?

Posted: 25 May 2016 02:51 PM PDT

There has been a few documentaries and some severely contested studies but nothing I can find gives a clear answer.

submitted by /u/krillskrills
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Ask Anything Wednesday - Economics, Political Science, Linguistics, Anthropology

Posted: 25 May 2016 08:05 AM PDT

Welcome to our weekly feature, Ask Anything Wednesday - this week we are focusing on Economics, Political Science, Linguistics, Anthropology

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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Is it possible to control which direction heat flows on the atomic of molecular levels?

Posted: 25 May 2016 11:54 AM PDT

Is there a material that can transfer heat in desired directions rather than just march towards equalizing temperatures between two objects? I don't have a background in physics or chemistry, I just had a curious thought after thinking about how well my Yeti cup keeps things cold. I'd love to learn more about our understanding of heat flow, and any cool efforts ongoing on the subject.

submitted by /u/How_Many_More_Times
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What is this 4,61 km big thing moving over the ocean floor and leaving a visible trail?

Posted: 25 May 2016 05:27 AM PDT

https://youtu.be/4hQ-rtEEAH4?t=3m16s

I stumbled over this video, and I would really like some awnsers other than "aliens". This looks really intriguing and I wonder why i never heard of this before. I posted it to /r/whatisthisthing but videos are not allowed there.

There must be a normal explanation for this, right?

submitted by /u/Nudelwalker
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Are watermelons, melons and cantaloupes related to pumpkins ?

Posted: 25 May 2016 06:10 AM PDT