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Sunday, February 3, 2019

AskScience Panel of Scientists XX

AskScience Panel of Scientists XX


AskScience Panel of Scientists XX

Posted: 02 Feb 2019 02:24 PM PST

Please read this entire post carefully and format your application appropriately.

This post is for new panelist recruitment! The previous one is here.

The panel is an informal group of redditors who are either professional scientists or those in training to become so. All panelists have at least a graduate-level familiarity within their declared field of expertise and answer questions from related areas of study. A panelist's expertise is summarized in a color-coded AskScience flair.

Membership in the panel comes with access to a panelist subreddit. It is a place for panelists to interact with each other, voice concerns to the moderators, and where the moderators make announcements to the whole panel. It's a good place to network with people who share your interests!


You are eligible to join the panel if you:

  • Are studying for at least an MSc. or equivalent degree in the sciences, AND,

  • Are able to communicate your knowledge of your field at a level accessible to various audiences.


Instructions for formatting your panelist application:

  • Choose exactly one general field from the side-bar (Physics, Engineering, Social Sciences, etc.).

  • State your specific field in one word or phrase (Neuropathology, Quantum Chemistry, etc.)

  • Succinctly describe your particular area of research in a few words (carbon nanotube dielectric properties, myelin sheath degradation in Parkinsons patients, etc.)

  • Give us a brief synopsis of your education: are you a research scientist for three decades, or a first-year Ph.D. student?

  • Provide links to comments you've made in AskScience which you feel are indicative of your scholarship. Applications will not be approved without several comments made in /r/AskScience itself.


Ideally, these comments should clearly indicate your fluency in the fundamentals of your discipline as well as your expertise. We favor comments that contain citations so we can assess its correctness without specific domain knowledge.

Here's an example application:

 Username: /u/foretopsail General field: Anthropology Specific field: Maritime Archaeology Particular areas of research include historical archaeology, archaeometry, and ship construction. Education: MA in archaeology, researcher for several years. Comments: 1, 2, 3, 4. 

Please do not give us personally identifiable information and please follow the template. We're not going to do real-life background checks - we're just asking for reddit's best behavior. However, several moderators are tasked with monitoring panelist activity, and your credentials will be checked against the academic content of your posts on a continuing basis.

You can submit your application by replying to this post.

submitted by /u/AskScienceModerator
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Why does our Sun have so many planets compared to other stars/solar systems?

Posted: 03 Feb 2019 04:55 AM PST

Our star has eight planets and numerous dwarf planets. On Wikipedia, I read that most stars only have 0 or 1 exoplanets. Is the difference:

a) our Sun is simply a statistical anomaly

b) other stars likely have similar numbers of exoplanets, but we can only detect large ones

c) related to something unique about our Sun?

Thanks!

submitted by /u/www_earthlings_com
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Does the size of your stomach actually shrink when you decrease your daily portion size?

Posted: 02 Feb 2019 04:36 PM PST

I always hear people telling me their stomach shrank and can no longer take in the amount of food that they once used to. Does your stomach really shrink/expand in size depending on how much you eat on a daily basis?

submitted by /u/NeuroendocrineDrug
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Have there been Mountains Taller than Mt. Everest on Earth in the Past?

Posted: 02 Feb 2019 11:54 AM PST

So, reading a post on this sub detailing the Wilson cycle and was wondering if there has been any evidence of mountains that in the past were either taller than 30,000ft or significantly taller?

I understand it might be nearly impossible to determine this but was wondering if there has been any research into it.

Thanks!

submitted by /u/UltraRunningKid
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Is the phase velocity of a signal in a transmission line dependent on the frame of reference?

Posted: 03 Feb 2019 06:13 AM PST

Say the dielectric constant is very high so that the phase velocity is much slower than the speed of light and that the transmission line is on a train moving at 100km per hour. If the signal is propagating in the same direction as the train, would an observer on the ground see the signal propagate at a higher velocity than someone on the train? Or would they both see the signal propagating at the same speed?

submitted by /u/yesireallyamthatdumb
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What impact has the US interstate road system had on wildlife?

Posted: 02 Feb 2019 03:17 PM PST

It seems like the US is partitioned into a grid where land animals can't cross from one square to another without becoming roadkill. Have different biomes emerged in the squares?

submitted by /u/side_lel
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How does your body know something you ate is bad and needs to throw it up (or send it on an express delivery out the back end)?

Posted: 02 Feb 2019 02:07 PM PST

Are there "anti" particles of the other forces?

Posted: 02 Feb 2019 10:23 PM PST

Antimatter is a particle that is identical but has opposite electromagnetic charge. Is their any equivalent that has opposite weak force or strong force?

submitted by /u/cryolithic
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What are the "hidden variables" supposed to be in quantum pilot wave theory?

Posted: 02 Feb 2019 10:53 AM PST

So when I (physics layman) started reading about quantum mechanics many years ago I got the impression that hidden variables was silly by adding needless complications and etc and was all but discarded (and eventually I settled on the "shut up and calculate" interpretation of QM).

Recently, though, I found out about De Broglie–Bohm (pilot wave) theory, and I find it rather appealing. But what are these hidden variable(s)? I know they are basically the "waves" that guide "particles," but I didn't find an interpretation for that. Would it make sense to think the hidden variables/guiding waves are simply sort of the universal state of each quantum field at any given moment? Or is that interpretation silly until when and if we marry pilot waves with at least special relativity?

Thanks!

submitted by /u/Tychoxii
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What does the term "cold blooded" in cold blooded actually mean? Could someone elaborate please?

Posted: 02 Feb 2019 09:54 AM PST

Do they need to warm up their blood? How do they survive in hot or cold environments? What fundamental things do they differ in from warm blooded animals?

submitted by /u/pahwadeepansh
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Do other planets have weather?

Posted: 02 Feb 2019 03:07 PM PST

Does a negative focal length cancel out an equal lens of positive focal length?

Posted: 02 Feb 2019 09:04 PM PST

If you have a convex lens of 20mm focal length would it be cancelled out by placing a concave lens of -20mm focal length in front of it?

submitted by /u/GuruMeditationError
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What would the stars at the South Pole look like?

Posted: 02 Feb 2019 01:25 PM PST

If you were to stand exactly on the South Pole at night on a clear night, would the stars be spinning around really fast? If not, why?

submitted by /u/Savingstobig
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Is there any minimum value of hfe for Wein Bridge oscillator? (like 44.54 for RC Phase shift oscillator) If not, why?

Posted: 02 Feb 2019 08:32 PM PST

Why or how does some marine mammals choose one specific island to live in? Even when there are several (apparently) identical ones around.

Posted: 02 Feb 2019 09:54 AM PST

We're in Ushuaia, argentinian patagonia. On a boat trip we've seen some lobos marinos (Brown fur seal) on a small rocky island. And this is an archipelago, there are several other similar islands around.

We've been wondering since then: why these animals choose one specific island and not another? There is an ecological or behavioral explanation?

The same for the birds, huge flocks in one island and none on other "identical" ones.

Thank you Muito obrigado :)

submitted by /u/thomasfeitoza
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Does lateral gene transfer have an effect on the human evolution?

Posted: 02 Feb 2019 09:39 AM PST

I've just started a biology class and we've been talking about lateral gene transfer and how the tree of life could actually be a web of life. Could we be sharing genetic information between each other horizontally? It got me thinking that since our DNA changes over the course of our lives, maybe HGT has something to do with that. I did a little bit of research on HGT (Horizontal Gene Transfer) in multicellular organisms and HGT between prokaryotes and eukaryotes, and what I've gathered from it is that there is some evidence of HGT between prokaryotes and eukaryotes, but eukaryote to eukaryote isn't a thing. But even HGT between prokaryotes and eukaryotes seems like it could have a big impact on the evolution of... well, everything, but more interestingly, humans. Here's a link to one of the articles I was reading.

submitted by /u/shawnalee07
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Why space/weather balloons are white instead of black ?

Posted: 02 Feb 2019 12:46 PM PST

Would'nt be beneficial to have your gas heated by radiation with a black balloon ?

submitted by /u/KeyShower
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Saturday, February 2, 2019

Why does the east coast of North America have so many barrier islands, while the west coast has almost none?

Why does the east coast of North America have so many barrier islands, while the west coast has almost none?


Why does the east coast of North America have so many barrier islands, while the west coast has almost none?

Posted: 01 Feb 2019 03:28 PM PST

Looking at a map, the whole east coast from Boston south into Mexico seems to have more miles of shoreline protected by barrier islands than not. On the west, from Washington all the way to South America, seems to be solid shoreline broken up only by the occasional bay. Why is this? Does this pattern occur anywhere else?

submitted by /u/peshgaldaramesh
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What is the difference between the streaks left behind from plane/jet engines that disappear quickly, and the ones that stay there for hours?

Posted: 01 Feb 2019 04:49 PM PST

Why does my lazy eye become 'lazier' when I'm tired?

Posted: 01 Feb 2019 04:56 PM PST

Is Antarctica 'straddling' the South Pole by continental drift coincidence, or is the spin of the Earth balancing it's position somehow?

Posted: 02 Feb 2019 07:38 AM PST

From the original Pangea, Antarctica seems the most conspicuously positioned and I would like to hear if there is any scientific reasoning why it is 'parked' over a pole.

submitted by /u/yamori_yamori
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Do polar vortexes also happen in the southern hemisphere?

Posted: 01 Feb 2019 10:36 PM PST

The polar vortex in North America is getting a lot of attention, but does it happen in the southern hemisphere as well? If not, why?

submitted by /u/im_not_tan_im_bronze
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How exactly does HPV cause cancer?

Posted: 01 Feb 2019 07:26 PM PST

I heard it a while ago when i got an HPV vaccine. When i tried to Google it, it just said that it converts surface cells to cancer. I think it has something to do with DNA but then wouldn't all viruses cause cancer?

submitted by /u/DrRiceIO7
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Does taking notes actually help us understand the content we’re learning (lectures, reading, studying)?

Posted: 01 Feb 2019 12:31 PM PST

Do the different isotopes of Hydrogen affect its properties?

Posted: 01 Feb 2019 10:06 PM PST

For example: I'm reading up on Hydrogens wikipedia page and there it states that hydrogens auto-ignition temperature is 500C (932F). That is for Hydrogen gas, H2.

Now if we took D2 instead or even T2, would that number change?

Would the issues of metal embrittlement differ with the heavier isotopes? Do the heavier isotopes affect combustion either used as fuel as is or in gasoline?

And another question a bit in the same topic: Can you hydrogenate a fluid the same way you could carbonate it?

submitted by /u/Daiephir
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Why will your teeth go back to their original positions after not wearing your retainer for a while?

Posted: 01 Feb 2019 05:56 PM PST

How do people determine contraception effectiveness rates?

Posted: 01 Feb 2019 01:55 PM PST

They say that condoms, for example, have an effectiveness rating of 85%. How do they study this to come up with this figure? Do they just have a bunch of couples who don't mind having kids try it 100 times?

submitted by /u/Riksor
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In a polar molecule eg water, what does the orbital/path of the shared e- look like?

Posted: 01 Feb 2019 06:50 PM PST

Why does tetanus cause a red line to form on your arm?

Posted: 01 Feb 2019 05:50 PM PST

A guy I work with was using a nail gun and shot through his finger, few days later a red line appeared on his forearm and it had to be treated for tetanus. What is going on inside your arm when you get tetanus? Why does it cause this red line?

submitted by /u/Buttality
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If two particles, Particle A and Particle B, are entangled, and if Person A, in possession of Particle A, breaks the entanglement, would it be possible for Person B, in possession of Particle B, to learn that the entanglement has been broken by using an interaction-free measurement?

Posted: 01 Feb 2019 09:16 AM PST

I read that the reason quantum entangled particles would not be able to facilitate faster-than-light communication is because any attempt to change the state of the particles would cause them to become disentangled. But if you could learn whether or not the entanglement has been broken, that yes/no could be converted into a binary digit. Or if Person A measured Particle A, collapsing the wave function, and if Person B could measure Particle B without interacting with it, then would it be possible for Person B to learn that Person A measured Particle A, because Particle B is no longer in superposition?

submitted by /u/AcediaRex
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Why do we check our forehead when we have a fever?

Posted: 01 Feb 2019 09:27 AM PST

Can a material be both electrically conductive and an isolator?

Posted: 01 Feb 2019 01:46 PM PST

I mean, for example, you flip a switch and make a material an isolator, and than flip it back so current can flow through it. Is that physically possible? Could you make that?

submitted by /u/SirIzzy1
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Is the weakening of the arctic jet steam and collapsing of the arctic vortex early signals of a impending ice age?

Posted: 01 Feb 2019 10:06 AM PST

Do you sweat while you're swimming?

Posted: 01 Feb 2019 09:30 AM PST

Friday, February 1, 2019

AskScience AMA Series: We are vertebrate paleontologists who study crocodiles and their extinct relatives. We recently published a study looking at habitat shifts across the group, with some surprising results. Ask Us Anything!

AskScience AMA Series: We are vertebrate paleontologists who study crocodiles and their extinct relatives. We recently published a study looking at habitat shifts across the group, with some surprising results. Ask Us Anything!


AskScience AMA Series: We are vertebrate paleontologists who study crocodiles and their extinct relatives. We recently published a study looking at habitat shifts across the group, with some surprising results. Ask Us Anything!

Posted: 01 Feb 2019 05:32 AM PST

Hello AskScience! We are paleontologists who study crocodylians and their extinct relatives. While people often talk about crocodylians as living fossils, their evolutionary history is quite complex. Their morphology has varied substantially over time, in ways you may not expect.

We recently published a paper looking at habitat shifts across Crocodylomorpha, the larger group that includes crocodylians and their extinct relatives. We found that shifts in habitat, such as from land to freshwater, happened multiple times in the evolution of the group. They shifted from land to freshwater three times, and between freshwater and marine habitats at least nine times. There have even been two shifts from aquatic habitats to land! Our study paints a complex picture of the evolution of a diverse group.

Answering questions today are:

We will be online to answer your questions at 1pm Eastern Time. Ask us anything!

submitted by /u/AskScienceModerator
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Why is Methane such a powerful greenhouse gas when it's absorption spectrum for terrestial radiation seems so narrow?

Posted: 01 Feb 2019 12:30 AM PST

So I've recently come across these graphs on some of these global warming conspiracy websites. https://wattsupwiththat.com/2014/04/11/methane-the-irrelevant-greenhouse-gas/

https://commons.wikimedia.org/wiki/File:Atmospheric_Transmission.png

They seem to show that Methane has pretty small absorption peaks in the terrestrial radiation spectrum compared to something like CO2 or water vapor. Since it's also much less prevalent in the atmosphere it seems unintuitive that it should have such a disproportionately large global warming potential(Over 28 the GWP of CO2 according to the EPA website).

So what's going on here? Does Methane have other peaks in it's spectrum outside the range of the graphs that account for it's high warming effect? Are there other factors our models need to take into account to properly describe the heat trapping abilities of gases in the atmosphere? Am I misunderstanding what global warming potential actually means? Are the graphs just wrong, or incorrectly labelled/interpreted?

submitted by /u/livinghorseshoe
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How long does it takes for a star to go supernova from the moment it starts to “burn” iron?

Posted: 01 Feb 2019 04:53 AM PST

The last exploitable element for a star is manganese, once the star starts burning iron the fusion reaction is no longer sustainable and the star starts dying. How long does it take for it to go supernova from this moment?

submitted by /u/Sbrez
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Why are rocket nose cones, such as SpaceX, rounded like a Von Karman Shape instead of pointed?

Posted: 01 Feb 2019 02:52 AM PST

I understand and sub sonic speeds, rounded shapes help with the flow detachment of the air but this changes at supersonic when the shock wave causes high pressure and drag.

Surely a pointed nose with more oblique shock than normal shock is better in those supersonic regions?

submitted by /u/Enjineer1
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Hydrology: Does river discharge affect bathymetry?

Posted: 01 Feb 2019 04:53 AM PST

Out of curiosity, would it be reasonable to assume the bathymetry of the ocean floor at the mouth of a major river would be shallower proximate to the river's mouth? My reasoning is that the discharge of sediment would accumulate to over time cause a shallower ocean floor. However, I can't find anything online to support this (maybe I'm googling it wrong)

submitted by /u/chuckles11
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How are enzymes produced on an industrial scale, instead of their natural occurrence?

Posted: 01 Feb 2019 08:07 AM PST

As far as my limited knowledge goes, enzymes are naturally-occurring catalysts to chemical reactions that lower the energy required for the transition state.

But how did people replicate these enzymes outside of their naturally-occurring scenarios in order to produce them on an industrial level?

For (silly) example: In the movie Fight Club, Tyler recounts how ancient people discover the cleansing properties of lye via the chemical reactions that happened in the river after their human sacrifices (the burnt flesh of the sacrifices mixed with lye upriver, and made the clothes downriver much cleaner due to a "soapy discharge").

But nowadays, lye is commercially produced (presumably without any sacrifices--human or otherwise.)

So, how exactly is this done?

submitted by /u/JamalBruh
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What’s the most reactive element?

Posted: 01 Feb 2019 12:53 AM PST

What does it mean it is too cold to snow?

Posted: 01 Feb 2019 07:24 AM PST

In some areas like the midwest, it is in the negatives. It is so cold that it is too cold to snow. How can that be?

submitted by /u/Lorenzoxo
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How can different sperm produce different offspring? Do they not have the same genetic code?

Posted: 01 Feb 2019 07:17 AM PST

How do Super-Sonic Parachutes work?

Posted: 01 Feb 2019 12:50 AM PST

Why are clouds for heavy rain really dark grey, but those for heavy snow light grey / white?

Posted: 01 Feb 2019 06:09 AM PST

Is there statistical evidence of certain times of the day when pregnant women are more likely to have their water broken?

Posted: 01 Feb 2019 07:18 AM PST

I was watching a documentary about some female mammals which only go into labour under certain climate/daylight conditions and wondered if humans do the same thing.

Thanks!

submitted by /u/00890
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Why does copper (Cu) only hold one electron in the 4s orbital?

Posted: 01 Feb 2019 07:15 AM PST

According to the rules it should be 3d9 4s2 but it is 3d10 4s1. I assume this is probably due to some energy state preferences but does anyone have a more accurate explanation?

submitted by /u/powellkk
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How does sportwear's wicking work?

Posted: 01 Feb 2019 07:05 AM PST

I find that the ability of a shirt to draw all the sweat out from the skin is pretty witchcraft-y, considering our experience with normal clothes. I've done a little bit of research about this, but the sites I found explain it in too vague a manner and with absolutely no picture or video at all. There are many questions in my mind right now. So,

  • Could you give a detailed explanation of moisture-wicking with easy to understand pictures or videos, or at least point me to that source?

  • If wicking is based on capillary action, then putting decency aside, is playing naked still better than any kind of Spandex? You know, maximum surface area in that case, while sportwear will never be fully attached to difficult areas like the armpits.

  • Wiki:

in activities such as skiing and mountain climbing this is achieved by using layering: moisture transferring (wicking) materials are worn next to the skin, followed by an insulating layer, and then wind and water resistant shell garments.

Does that mean the sportwear will become a balloon full of water? Because water will be trapped between the transferring material and the insulating layer, with no moving air to help the evaporation because of the resistant shell, LOL. This significant extra weight is a climber's nightmare IMHO.

  • Still Wiki:

Drywicking is the newest variation of moisture wicking. It is a smart two tier fabric that breaks the surface tension of sweat and propels it through the hydrophobic layer into a natural wicking outer layer

How can a fabric break sweat's surface tension? What does it have to do with the easier propelling?

That's about all I can think of for now. Thank you.

submitted by /u/Long_try
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Does the amount of water you steep a tea bag in effect the amount of caffeine you get?

Posted: 01 Feb 2019 06:59 AM PST

This may be a stupid question, but I've been trying to switch from coffee to tea and in my research, it will commonly say "there is X amount of caffeine in an 8 oz. cup of tea."

When it comes to coffee, I know that a bigger cup of coffee typically equals more caffeine.

When it comes to tea though, I would imagine the caffeine is strictly dependent on the tea bag.

But my question is, if 8 oz. of boiling water activate X amount of caffeine in tea, is there more caffeine potential in the tea bag if you steep it in more water?

submitted by /u/badmonkingpin
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How can we "create" coherent electrons when decoherence is supposed to be irreversible?

Posted: 01 Feb 2019 12:41 AM PST

Why do dogs pant and hang their tongues out such a lot when wolves (and most animals) do not? Is it a trait that somehow selected for during domestication?

Posted: 31 Jan 2019 10:26 AM PST

How do we determine from experiments the charge of a muon particle?

Posted: 31 Jan 2019 08:18 AM PST

I understand that we can determine its charge to mass ratio by looking at deviations of the particle in magnetic and electric fields. But how did scientists determine the charge or mass on a single muon particle, without prior assuming it to be equal to charge of electron.

submitted by /u/anhedo11
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We just learned Gauss’ Law in General Physics 2. It got me thinking, is there any reason we can’t apply Gauss law to gravitational fields and such?

Posted: 31 Jan 2019 09:58 AM PST