Pages

Friday, October 19, 2018

If we've only had plastics for the last 80 years, how do we know it will take thousands of years to decompose?

If we've only had plastics for the last 80 years, how do we know it will take thousands of years to decompose?


If we've only had plastics for the last 80 years, how do we know it will take thousands of years to decompose?

Posted: 18 Oct 2018 06:01 PM PDT

How come we are able to detect planets thousands (millions?) of light years away from us, but we have yet to determine with 100% certainty whether or not there is a ninth planet in our solar system?

Posted: 19 Oct 2018 04:15 AM PDT

I've been trying to teach myself a little about time, but as someone with little knowledge to base my understanding off of, I am having a hard time understanding why time passes differently if you are standing on a mountain than if you are sitting in a valley. Could you explain this concept to me?

Posted: 19 Oct 2018 12:14 AM PDT

Outside of the moral implications for humans, is cannibalism within a given species harmful?

Posted: 19 Oct 2018 03:03 AM PDT

What effect, if any, does the earth’s rotation have on weather patterns?

Posted: 19 Oct 2018 03:14 AM PDT

Michael from VSauce explained in one of his videos that "gravity" may not be an independent force but the result of objects trying to move in a straight line through time in curved time space. How does this fit with string theory/ why isn't there more information on this theory?

Posted: 18 Oct 2018 09:47 PM PDT

The video is on YouTube and titled "Which way is down?"

submitted by /u/xXCANCERGIVERXx
[link] [comments]

When a virus injects a cell with DNA, what makes the cell able to follow the instructions? Could the process be controlled for medically useful reactions?

Posted: 18 Oct 2018 08:09 PM PDT

From what I've remember in school, viruses inject a living cell with DNA in a way that somehow makes it listen to that instead of what it already had, reproducing virus after virus until the cell is depleted. How does the new DNA supplant the existing DNA?

Once replaced, what enables the cell to turn itself into something else? I was under the impression that stem cells were valuable for their special ability to do something similar?

If viruses are reproducing that effect, can we use them?

I'm sorry if this is super obvious or simplistic, but I tried to research it today and everything I found was not helpful at all.

submitted by /u/DanNeider
[link] [comments]

What would the Environmental/Physical Constraints be of sending Garbage to the Bottom of the Ocean?

Posted: 19 Oct 2018 06:25 AM PDT

With the great pressure at those depths it would compact all the plastic, It wouldn't mess with 99% of wildlife, and all you need to do is contain and weigh-down the garbage. If you make compact Cubes of it (Like crushing Cars) how well would this work? Is it only a Cost thing? Any Environmental concerns I'm not considering? Other than the obvious Fluids etc contamination which is likely much less than our current state. Would the pressure cause the decomposition of this material faster? Would small pieces just continuously break off making it no better than traditional dumping? Would a Net to contain this break off work or be a viable solution?

Any other Questions or In-site would be appreciated.

submitted by /u/Engineer_ThorW_Away
[link] [comments]

What's between protons/neutrons and electrons?

Posted: 19 Oct 2018 06:03 AM PDT

How Are Supermassive Black Holes Formed?

Posted: 18 Oct 2018 11:28 PM PDT

Why is the Barium Ion paramagnetic if it has no unpaired electrons?

Posted: 18 Oct 2018 08:22 PM PDT

Really confused on this and I am having a lot of trouble finding any articles with explanations on this. Was wondering if any chemists knew the answer.

submitted by /u/TheLegendaryTrev
[link] [comments]

How accurate are mental health diagnoses? Isn’t it heavily based on what the patient says they are experiencing without any biological or chemical markers to validate the claims?

Posted: 18 Oct 2018 04:13 PM PDT

Also, isn't it fair to say that due to the nature of mental illness the actual people who are mentally ill probably aren't aware enough, or are able to avoid seeking treatment whereas people who are overly sensitive may seek treatment for something that isn't actually in need of psychological treatment?

submitted by /u/karpomalice
[link] [comments]

According to the Theory of Evolution and the Theory of Plate Tectonics and Continental Drift, how did humans get all throughout the world?

Posted: 18 Oct 2018 11:44 PM PDT

From my understanding of below basic biology of animals and adaptation, how did humans, or the mammal(s) that evolved to eventually become humans, live in certain climates? If at one point Pangea existed, and eventually the land masses break apart, how would the mammals of that continent become human? Mammals need certain climates to survive, so in a cold climate like Russia or Alaska, how did the certain mammal that became human survive the conditions of weather and climate in a place like russia?

submitted by /u/Warlock9510
[link] [comments]

Some aminoacids need sodium to be absorbed?

Posted: 18 Oct 2018 02:37 PM PDT

if an aminoacid is absorbed with the help of sodium- dependent transporters does that the AA must be taken with sodium in order to be absorbed from the intestinse or the blood sodium levels have an impact on the rate of absorbtion?

submitted by /u/tisho23
[link] [comments]

Is there reasearch done for how color enhances memory?

Posted: 18 Oct 2018 01:23 PM PDT

I'm looking for research that I could have sworn I've read but now I can not find.

I'm looking for an experiment were the color a word is written in is the same as the color of the object that word represents eg. Writing firetruck in red, or grass in green.

Has anyone read and remember any research like this?

submitted by /u/Shupsta
[link] [comments]

What are the main cognitive mechanisms, either conscious or subconscious in nature, guiding speech production in conversational settings ?

Posted: 18 Oct 2018 03:51 PM PDT

I was always under the impression that engaging in conversations involved mostly subconscious thinking, as opposed to other communication activities such as giving a speech off a text/memory or giving a presentation by reading things off slides, both of which typically have a more dominant conscious cognitive component. When we converse with a friend for instance, we usually just translate whatever thoughts popping in our minds into words and sentences, with minimal conscious filtering/selection and structuring... But then I thought about the case of purely improvisational talking situations such as improv theatre or freestyle rapping, and how speech production in these is even more subconsciously-dominated, implying that my initial intuition might be wrong and that there might be an important conscious component to speech production in typical conversation-making.

All of which brings me to the following question(s): in a conversational situation, how does the mental process governing speech production usually go ? Upon hearing and understanding a question, do our brains subconsciously come up with a certain structure to our answers, which we then proceed to subconsciously follow as we speak ? Or is that structuring more of a conscious process ? Or is there no structuring process at all involved, and instead -as I've described at the very beginning- what happens is a purely subconscious translation of whatever thoughts our brains generate at the moment of us talking/responding ?

To use Daniel Kahneman's language, by subconscious I mean system 1 thinking and by conscious its system 2 counterpart. I apologize if my question and terminology are confusing as I am no psychology/cognitive science expert, but this question has been perplexing me a lot lately !

submitted by /u/MC_Tikchbila
[link] [comments]

Can the energy of a particle be deduced from its De Broglie wavelength?

Posted: 18 Oct 2018 01:12 PM PDT

I know that for a single photon we have : E = h * f

On the other hand we have the De Broglie equation : LambdaB = h / p, which as far as I know is true for any particle.

So from the De broglie equation we can deduce a "de Broglie wavelength" (lambdaB) for any particle, and from that wavelength, a frequency "fB" (as de Broglie frequency).

So I wondered if we could have a relation between the total energy of said particle, and the de Broglie frequency "fB", in a fashion similar to E = h f, which however would be true for any particle. (or a formula that would work in both cases)

And what formula would give the energy of a gluon or a graviton which are massless?

submitted by /u/EresArslan
[link] [comments]

Does compulsory therapy work? Why or why not?

Posted: 18 Oct 2018 08:24 PM PDT

Can Outside noises evoke images in our dreams?

Posted: 18 Oct 2018 04:01 PM PDT

Today, I set my morning alarm. I have had the same alarm tone for one week straight. Today, I was so used to hearing it, that i could hear the alarm in a dream I was having. That made me wonder, could any sound do that? I was curious and kept thinking on the subject today. So I wondered "Could the sounds of the outside evoke thoughts in our dreams?" For example, if you played a voice recording of your friend, and it didn't wake you, would you think things about, or would your friend appear, in your dream?

submitted by /u/blkrj33
[link] [comments]

How do freezer burns happen?

Posted: 18 Oct 2018 08:37 AM PDT

I was always thinking that the fast movement of heated atoms/molecules was causing burns since these fast moving particles destroy our skin cells because of the High Amounts of Energy. So I recently found myself stuck when i thought about Freezer burns. How do Very cold particles cause such burns? I thought cold meant absence of Energy, am I missing something? I'd Love to hear an answer, thanks in Advance!

submitted by /u/MisterR4Z0R
[link] [comments]

Are there any images of de novo synthesized nucleotides?

Posted: 18 Oct 2018 03:18 PM PDT

It is my understanding that nucleotides are synthesised in the liver and are ubiquitous intracellular compounds. Have they ever been extracted/isolated and imaged or had their structure solved, or is this beyond our capabilities?

Cryo EM crystallography, NMR should be appropriate techniques to determine the structure and atom disposition of molecules this size. I am struggling to find the data. Any pointers?

submitted by /u/ImportantDingo
[link] [comments]

Thursday, October 18, 2018

What's the margin of error for atomic clocks?

What's the margin of error for atomic clocks?


What's the margin of error for atomic clocks?

Posted: 17 Oct 2018 02:33 PM PDT

We are scientists from the Society of Vertebrate Paleontology coming to you from our annual meeting in Albuquerque, New Mexico. We study fossils. Ask Us Anything!

Posted: 18 Oct 2018 04:27 AM PDT

Hello AskScience! We are members of the Society of Vertebrate Paleontology. We study fossil fish, mammals, amphibians, and reptiles — anything with a backbone! Our research includes how these organisms lived, how they were affected by environmental change like a changing climate, how they're related, and much more.

You can learn more about SVP in this video or follow us on Twitter @SVP_vertpaleo.

We're bringing you our fifth annual AMA from our 78th Annual Meeting in Albuquerque, New Mexico. Ask us your vertebrate paleontology questions! We'll be here to answer your questions at 10am Mountain Time (noon eastern)!


Joining us today are:

  • PastTime Podcast hosts Matt Borths, Ph.D. and Adam Pritchard, Ph.D.: Dr. Pritchard studies the early history of the reptiles that gave rise to lizards, dinosaurs, crocodiles and birds. Dr. Borths works on the evolution of carnivorous mammals and African ecosystems. Find them on Twitter @PastTimePaleo.

  • Stephanie Drumheller, Ph.D. is a paleontologist at the University of Tennessee whose research focuses on the processes of fossilization, evolution, and biology, of crocodiles and their relatives, including identifying bite marks on fossils. Find her on Twitter @UglyFossils.

  • Eugenia Gold, Ph.D. studies brain evolution in relation to the acquisition of flight in dinosaurs. She is also an author of the book She Found Fossils.

  • Dr. Randall Irmis, Ph.D. is chief curator and a curator of paleontology at the Natural History Museum of Utah (@nhmu), and an associate professor in the Department of Geology & Geophysics at the University of Utah. He specializes in understanding in how ecosystems change through time in response to climate and other events, particularly during the Triassic Period, the beginning of the age of dinosaurs. You can listen to his recent appearance on Science Friday here: https://www.sciencefriday.com/segments/utah-is-a-gold-mine-for-fossils/

  • Jessica Lawrence Wujek, Ph.D. main area of study is in marine reptiles, specifically Ichthyosaurus. She did her Ph.D. work on the genus Ichthyosaurus, looking at the phylogeny and morphometrics of the genus. She currently teaches geology at Howard Community College part time, and is trying to get my 3 year son into dinosaurs! She also has a blog talking about the accuracy and entertainment value of books with any prehistoric theme.

  • Jennifer Nestler studies crocodylian ecology and evolution. She has studied both modern and fossil crocodylians, and is a project manager for the Croc Docs, a research lab at the University of Florida that focuses on reptiles and amphibians in the Everglades.

  • Ashley Reynolds is a PhD student at the University of Toronto and Royal Ontario museum. She studies the growth, ecology, and behaviour of living and extinct cats, with an emphasis on the famed sabre-toothed cat Smilodon fatalis. You can find her on Twitter and Instagram @ashinonyx

  • Ashley Poust is a Ph.D candidate at the University of California, Berkeley. He is interested in links between animal life history and major events in evolution. His focus is on the evolution of paleogene mammals, primarily using osteohistology. He also works with other taxa, especially dinosaurs, pterosaurs, and marine mammals, to address similar questions of diversity, ontogeny, and life history across vertebrates. You can find him on twitter @AshPoust.

submitted by /u/VertPaleoAMA
[link] [comments]

Are there any cases where the sudden absence of a species had an effect of the function and economy of that area?

Posted: 18 Oct 2018 05:20 AM PDT

Do all links in a chain experience the same force when carrying a load?

Posted: 18 Oct 2018 02:52 AM PDT

Hey lovelies!

Imagine a steel chain, suspended with a weight attached on the end. Would the links further up have greater force acting on them as they would be holding up more links or would the 'equal and opposite' thing balance everything out.

And now imagine a chain drawn horizontally with a force applied to both ends - would gravity have a greater effect in the middle of the chain as there would be more leverage there if you see the chain as pivoting from the ends? And what if you had the same situation without gravity?

If there are different forces on different links could you strengthen those links and efficiently increase the overall strength of the chain?

I look forward to hearing your thoughts.

submitted by /u/slane14
[link] [comments]

Does a sudden population boom cause unemployment to rise significantly, or does the number of jobs increase with the rising demand for services?

Posted: 17 Oct 2018 07:25 PM PDT

How fast do electrons move in a circuit?

Posted: 18 Oct 2018 03:12 AM PDT

I was going over some slides for my class, which was going over velocity saturation in a transistor, and stated that the carrier's reach velocity saturation at approx 105 m/s, which confused me as I had heard that in a circuit the electrons go very slowly, so looking it up I found a figure of 2.5 *10-4 m/s. This is 9 orders of magnitude difference, so what is the actual answer?

I'm aware that in the transistor its at its velocity saturation, but would that explain literally a billion times faster?

submitted by /u/feeksmcgee
[link] [comments]

During Pair production, how does a massless photon gets converted into Electron and Positron which does have a mass?

Posted: 18 Oct 2018 05:51 AM PDT

Does the process involves gaining of mass somehow?

submitted by /u/Sir_Devil
[link] [comments]

Why don't we throw trash in volcanoes instead of using landfills?

Posted: 17 Oct 2018 04:58 PM PDT

What would this do to the environment? I guess the trash would break down in the lava but still be there in a different form?

Or better yet, use some sort of strong chemical to rid of the trash? This could be done inside of protective covering that filters the smoke/whatever it may be from polluting the air.

submitted by /u/greatfiginthesky
[link] [comments]

How can you measure the doubling of a temperature?

Posted: 18 Oct 2018 12:10 AM PDT

If you use Celsius, the double of 10 degrees, is 20 degrees. But if you use Kelvin, the doubling of 283 degrees Kelvin(10 degrees Celsius) is 293 degrees Celsius?

submitted by /u/fr8oper8er
[link] [comments]

What role does the liver play in the development of Type-2 Diabetes?

Posted: 17 Oct 2018 03:41 PM PDT

Hi.

I posted this to r/nutrition and was recommended I post here instead.

I'm currently reading he book "The Diabetes Code" by Jason Fung. Great book; about half way through now. The book is generally very easy to understand, but one area I'm struggling to get is the contribution of the liver in development ld the disease.

As I understand the development of Type 2 Diabetes: Repeated spiking of insulin due to the ingestion of excess, refined carbohydrates creates a vicious cycle. In a normal person, Insulin is secreted to bring the high blood sugar down by carrying the glucose into the body's cells. Excess glucose is stored in the liver to be used for energy later. Excessive spiking of this insulin/glucose mechanism due to the persons eating habits causes insulin resistance at the cell, whereby it is full with glucose and not wanting any more. This creates a problem with excess blood glucose. The overstuffed cells are not responding to insulins mechanism, and so the body attempts to compensate by pumping out more insulin. The result, at first, is that some glucose can be forcibly placed in the cell. Eventually though, no more glucose can be physically pushed into the overcrowded cell no matter how much insulin is secreted; the result eventually being chronically high blood glucose and high insulin levels. A vicious cycle ensues where by the more insulin creates more resistance . The next part (providing I'm correct with the above) is where I get confused. Some interaction between insulin and the liver enables the large amounts of glucose to be converted into fat via denovo lipogenisis. Eventually even this mechanism cannot save the body, and the excess fat produced by the liver accumulates there (as fatty-liver) and all over the body as subcutaneous, visceral and internal organ fat; which is what we see eventually with the pancreas when all the excess fat surrounding it starts to destroy beta cells and inhibit insulin production. The combination of fat destroying the beta cells and insulin production plus insulin resistance causes the person to become diabetic (type-2).

Could someone who knows explain the liver/insulin relationship to me? I've read over it several times but I just don't understand it. The above paragraph is all I can gleam from it and I know I'm missing large chunks.

Thanks very much!

submitted by /u/NT202
[link] [comments]

Is it possible we're seeing duplicate stars?

Posted: 17 Oct 2018 11:18 AM PDT

With gravitational lensing, is it possible that when we observe the sky, depending on the celestial bodies that our perspective passes, that there's certain stars that may be appearing more than once in the sky?

If we're looking past a nebula or a black hole then the light trajectory projected from the star could be coming from an area nowhere close to where it appears in the sky. In the same vein, when we look in a different area of the sky, we could be seeing the same star and not even be aware of it because the arrangement of the stars seems unique because we're observing them at a completely different angle and a farther distance.

We could have even have named the same star several times and not realize it.

It's even possible there's a certain direction we could look and be observing our own solar system.

submitted by /u/ernestwork
[link] [comments]

Why do electrons form orbitals and shells?

Posted: 17 Oct 2018 10:48 PM PDT

How does the 10 trillion FPS camera work?

Posted: 17 Oct 2018 08:22 AM PDT

Why is oxygen sometimes added in small amount to shielding gas when welding?

Posted: 17 Oct 2018 10:39 AM PDT

I know that the oxygen will react with the filler or parent metal causing all sorts of defects, that's why we are trying to prevent oxygen from the atmosphere reaching the weld. So why do some people add oxygen to there shielding gas mix where it will be in direct contact?

submitted by /u/JackChigger
[link] [comments]

What if the Earth spun more than just on its polar axis?

Posted: 17 Oct 2018 09:25 AM PDT

Right now Earth spins about its N-to-S pole, say, the "Z-axis." What kinds of things would happen if that Z-axis also spun about the center of the Earth (i.e. the north pole oscillates between being close and far away from the sun) at roughly the same speed it spins already in a day, give or take?

Is this even possible? My crude understanding of planet formation and psychics tells me no.

submitted by /u/_YoungLink_
[link] [comments]

Why does decreasing the pressure in an equilibrium reaction favour the side with the most moles?

Posted: 17 Oct 2018 09:08 AM PDT

In terms of Le Chatelier's principle, increasing the pressure of a system causes the reaction to favour the "side" with the least moles. My understanding is this is because gas particles like to have as much space as possible, and there is more space if there is a smaller number of moles(despite the mass being the same) . So when pressure is decreased, the reaction favours the "side" with a larger amount of moles of gas - but if the gas wants as much space as possible, it is still more spaciously efficient to be a small number of moles. Why is this? (Obviously in an actual reaction there would be other factors contributing to the equilibrium of the reaction however this scenario is theoretical and imagines the only variable would be pressure )

submitted by /u/chargrilledjetski
[link] [comments]

Wednesday, October 17, 2018

AskScience AMA Series: We're from Pacific Northwest National Laboratory. Our recent work in data visualization has led to the creation of a new colormap, cividis, for more consistent, accurate data interpretation - whether you have a color vision deficiency or not! Ask us anything!

AskScience AMA Series: We're from Pacific Northwest National Laboratory. Our recent work in data visualization has led to the creation of a new colormap, cividis, for more consistent, accurate data interpretation - whether you have a color vision deficiency or not! Ask us anything!


AskScience AMA Series: We're from Pacific Northwest National Laboratory. Our recent work in data visualization has led to the creation of a new colormap, cividis, for more consistent, accurate data interpretation - whether you have a color vision deficiency or not! Ask us anything!

Posted: 17 Oct 2018 04:00 AM PDT

Hi Reddit! We're Jamie Nunez and Dr. Ryan Renslow, scientists at Pacific Northwest National Laboratory. Rainbow colormaps have long been known to make data interpretation difficult and sometimes even impossible for those with colorblindness, yet they are still very popular due to limited alternatives. That's why we developed an open-source Python module that can automatically convert colormaps into forms easily interpreted by those with or without color vision deficiencies. One colormap in particular that we created, called cividis, enables consistent and accurate data interpretation for both people with normal vision and those who are colorblind. Cmaputil can be used by anyone to create their own optimized colormaps and can be accessed here: https://github.com/pnnl/cmaputil

Cividis is currently available in Python (matplotlib & plotly packages), R (viridis & viridisLite packages), COMSOL, and more. Read our PLOS One paper "Optimizing colormaps with consideration for color vision deficiency to enable accurate interpretation of scientific data" here: https://goo.gl/UDPWFd

We'll be on at noon PT (3 p.m. ET, 19 UT). Ask us anything!

submitted by /u/AskScienceModerator
[link] [comments]

Since electricity flows on the surface of its conductor could metal tubing of equal surface area be substituted for solid core wire?

Posted: 17 Oct 2018 03:22 AM PDT

Why does superfluidity only occur in helium?

Posted: 16 Oct 2018 08:43 AM PDT

Why does red light preserve night vision and reduce eye strain more than other colors?

Posted: 16 Oct 2018 04:53 PM PDT

Why do shoelaces untie?

Posted: 17 Oct 2018 07:26 AM PDT

They obviously do, but what process leads to it?

submitted by /u/Frantyzer
[link] [comments]

Do animals (and plants) that are accustomed to seasonal weather changes e.g bears, deer, wolves etc. lose this trait over the generations when they are transplanted to climates that do not have winters or have very mild winters?

Posted: 16 Oct 2018 07:08 PM PDT

If the whole world were to experience some drastic increase in temperature that eliminated winter and lasted a thousand years, would seasonal plants and animals, if the world set itself right again, be able to survive a winter? And also, how did plants and animals react with the end of interglacial periods?

submitted by /u/Killer_B_Cell
[link] [comments]

Historically, how was it determined that the atmosphere has an ozone layer?

Posted: 17 Oct 2018 07:04 AM PDT

Also, how was the depletion of the layer discovered?

submitted by /u/shadyrapsfan
[link] [comments]

Do echidnas, porcupines and hedgehogs (and any other spiky creatures) have similar ancestors?

Posted: 17 Oct 2018 04:33 AM PDT

If not, as I would suspect is the case given that echidnas, for example, are monotremes, then how did such similar creatures come to evolve so far apart geographically?

submitted by /u/bornofthemachine
[link] [comments]

Reading a MSDS on MgSO4 anhydrous, says inhaling may cause irritation of the throat, but when I googled inhalation of MgSO4 it came up as a treatment for Asthma, how does this work and/or am I misunderstanding something?

Posted: 17 Oct 2018 04:05 AM PDT

This is the MSDS, I'm writing about the hazards of purification of Magnesium sulfate synthesised for an A level PAG. Thanks in advance for any help.

submitted by /u/MrCookieFrog
[link] [comments]

If the sun’s radiation, EM waves, heat up the earth, is the earth affected by the EM waves of other stars that we can see? If so, how powerful is that effect?

Posted: 17 Oct 2018 03:39 AM PDT

Except for the human flu vaccine, why do dogs/cats need vaccines boosted every year while people don’t?

Posted: 17 Oct 2018 05:47 AM PDT

For instance Rabies and distemper vaccines in animals versus dtap and mmr vaccines in people.

submitted by /u/Kwazy_Cupcakes
[link] [comments]

Do we have models to predict how rocks fracture?

Posted: 16 Oct 2018 05:46 PM PDT

More precisely, say I wanted to simulate whacking a smooth, round pebble with a hammer so that a crack appears. Do our current models of rocks fracturing precisely predict the exact geometric shape of these cracks that appear?

What are good references for this?

submitted by /u/maruahm
[link] [comments]

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

Posted: 17 Oct 2018 08:11 AM PDT

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
[link] [comments]

Why is there only one jfet transfer curve for a perticular jfet??

Posted: 17 Oct 2018 02:03 AM PDT

Some species don't breed in captivity. Why? What's keeping them?

Posted: 17 Oct 2018 04:09 AM PDT

So, how do we know the exact mass of any planet apart from earth?

Posted: 16 Oct 2018 10:54 PM PDT

I guess you could explain how do we know the composition of a planet too. Thanks.

submitted by /u/asgoritolin
[link] [comments]

How can trees grow around and “consume” things like fences?

Posted: 16 Oct 2018 01:10 PM PDT

Why is the Voyager 1 traveling so fast?

Posted: 16 Oct 2018 02:07 PM PDT

I know that the Voyager 1 travels at about 63'000 km/h but how was it able to even get to that speed?

submitted by /u/TheUnknownLyricsMan
[link] [comments]

Is vasovagal syncope always chronic?

Posted: 16 Oct 2018 08:59 AM PDT

I was looking at it online and saw it said somewhere that it goes away in a week or so, so does that mean it's not always a permanent condition?

submitted by /u/UnknownVillager
[link] [comments]

Does the sun's spectral output change at all?

Posted: 16 Oct 2018 04:47 PM PDT

Many illuminant standards such as CRI use "daylight" as a reference, with a higher score seeming to indicate a higher similarity to the sun's spectral output.

However, aside from the sun's color changing due to its position in the sky (as light is scattered by our atmosphere), I realize that there are solar flares, sun spots, and other phenomena that might influence it's spectral output from time to time.

Is anyone measuring this? Is the "daylight" standard an average of many spectral measurements over time? I get that our eyes evolved in response to the sunlight available to us, and thus our perceptions of color, so I was wondering how that is involved in engineering high-CRI light sources.

I'm also not referring to the general aging of a main sequence star, and it's gradual cooling off over millennia.

Thanks!

submitted by /u/miamijuggler
[link] [comments]