AskScience Panel of Scientists XVI |
- AskScience Panel of Scientists XVI
- AskScience AMA Series: I'm Lawrence Krauss, Chair of the Board of Sponsors of the Bulletin of the Atomic Scientists, ask me anything!
- Do all galaxies have a very massive object at their center? If so, is it necessarily a black hole?
- why can't particles of zero mass be at the rest?
- Why is lead always the element used to protect us from radiation?
- Is there any evidence that pheromones play an active role for mating in humans?
- Do our pupils dilate when we dream about light?
- Is our galaxy on a stable axis?
- If you drill a hole in a metal plate and then freeze the plate, does the hole get smaller, bigger or stays the same?
- Where do the electrons go in a Neutron Star?
- Why is there only positive or negative electric charges?
- Why do antihistamines cause drowsiness when they cross the Blood Brain Barrier?
- [Mathematics] Does df/dx behave like a fraction?
- [Chemistry] What is smell?
- If two astronauts are traveling half the speed of light away from each other, and looking behind them, what would they each see?
- How does lasing cause transitions from the metastable state when by definition the selection rules forbid it?
- How does corking a baseball bat cause the ball to travel further when hit?
- Affinity chromatography or coimmunoprecipitation: When should someone use one or the other?
- Before it was possible to repair an ACL with surgery, were there any treatment options for those who suffered one?
- Could perpetual motion be created somehow in a vaccum chamber with zero gravity?
| AskScience Panel of Scientists XVI Posted: 02 Feb 2017 04:54 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:
Instructions for formatting your panelist application:
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: 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. [link] [comments]  |
| Posted: 03 Feb 2017 04:00 AM PST Lawrence Krauss, a renowned theoretical physicist, is director of the Origins Project at Arizona State University as well as the Chair of the Board of Sponsors of the Bulletin of the Atomic Scientists, who recently moved the Doomsday Clock 30 seconds closer to midnight. He is the author of more than 300 scientific publications and nine books, including the international bestsellers, A Universe from Nothing, The Physics of Star Trek, and the upcoming book The Greatest Story Ever Told--So Far. The recipient of numerous awards, Krauss is a regular columnist for newspapers and magazines, including The New Yorker, and he appears frequently on radio, television, and in feature films. Krauss lives in Portland, Oregon, and Tempe, Arizona. Lawrence will be joining starting around 2 PM ET (19 UT). [link] [comments]  |
| Do all galaxies have a very massive object at their center? If so, is it necessarily a black hole? Posted: 03 Feb 2017 04:51 AM PST |
| why can't particles of zero mass be at the rest? Posted: 02 Feb 2017 06:23 PM PST in a book I'm reading it says the fact that a particle has zero mass means, in a way, that it cannot be at rest. why is that? [link] [comments]  |
| Why is lead always the element used to protect us from radiation? Posted: 02 Feb 2017 03:19 PM PST To expand a bit, what properties does lead have that make it so good at protecting from radiation. How does it actually keep the radiation from touching us? What is happening at the atomic level? [link] [comments]  |
| Is there any evidence that pheromones play an active role for mating in humans? Posted: 02 Feb 2017 06:15 PM PST |
| Do our pupils dilate when we dream about light? Posted: 02 Feb 2017 11:56 AM PST Last night I dreamt about being in a very dark room for a long time. Eventually I walked outside and was met by this very bright daylight. It hurt my eyes, but the pain eventually disappeared, as it would in a real life situation, because of our pupils adjusting. I found this very fascinating, because it's probably all imaginary, but it felt so real. Do our eyes react to imaginery impulses, like in this case, (bright) light in a dream? PS: I don't know the antonym of dilating in the context of pupils, so I stuck with it in the title. [link] [comments]  |
| Is our galaxy on a stable axis? Posted: 02 Feb 2017 10:31 AM PST Watching this video, I started to wonder, if a rotating object in zero-G is on an unstable axis, the object will rotate on a different intermediate axis to try and correct the instability. Does the Milky Way Galaxy also rotate like this? Does a lack of rotation suggest a stable axis? [link] [comments]  |
| Posted: 02 Feb 2017 08:32 AM PST |
| Where do the electrons go in a Neutron Star? Posted: 02 Feb 2017 11:37 AM PST I have been reading a little bit about neutron stars and I think they are really fascinating. However, I've never understood where the electrons go when the atoms collapse into neutrons. It was explained to me that the protons in the nucleus absorb the electrons, giving the atom a neutral charge. But, neutrons are made up of 2 down quarks and an up quark without an electron in it. So what happens to the electron? [link] [comments]  |
| Why is there only positive or negative electric charges? Posted: 02 Feb 2017 05:25 PM PST How do we know there is no "sub-negative" or "sub-positive" charges, or even a whole different set of undiscovered charge values? [link] [comments]  |
| Why do antihistamines cause drowsiness when they cross the Blood Brain Barrier? Posted: 02 Feb 2017 05:59 PM PST This article explains it well,
but it does not specify why first-generation antihistamines cause drowsiness when they cross the BBB. What effects do these antihistamines have on the central nervous system once it crosses the barrier? [link] [comments]  |
| [Mathematics] Does df/dx behave like a fraction? Posted: 02 Feb 2017 09:58 AM PST If df/dx=2x with f=x2, is df/2x=dx? We had this question when we were doing integration with substitution. Some said no because it's an operator not a fraction but it does in fact work if you use it for integration. [link] [comments]  |
| Posted: 02 Feb 2017 04:20 PM PST I know that smell is essentially molecules attaching to smell receptors in our noses(correct me if I'm wrong). So does that mean when something smells, it's "decomposing"(the source's particles escaped?)? What causes smell to originate from the source? [link] [comments]  |
| Posted: 02 Feb 2017 07:09 AM PST |
| Posted: 02 Feb 2017 10:32 AM PST I have a basic question about laser physics that doesn't seem to be answered in any of the standard introductory books on my shelf. I understand that in order to create a population inversion you need to excite transitions to a metastable state, and that the lasing occurs with stimulated emission of transitions from the metastable state. However, this seems to be a contradiction in terms, which is strangely not addressed anywhere I can find online or in my textbooks! For example, in 'Modern Physics' by Thornton & Rex, they say: "The key is that the transition from E2 to E1 must be forbidden, for example, by a Delta l = +- 1 selection rule. Then the state with energy E2 is said to be metastable." And then a few lines later they say that the lasing transition is the stimulated emission of exactly the previous transition they just described as "forbidden." And certainly the aforementioned selection rule would prevent the stimulated emission by a photon of spin 1 angular momentum, since the metastability is due to such a transition not being possible (for example the metastable state being in the 2s state, so the only lower state is 1s, so a transition would have Delta l = 0, which is not allowed). What am I missing? [link] [comments]  |
| How does corking a baseball bat cause the ball to travel further when hit? Posted: 02 Feb 2017 09:11 AM PST |
| Affinity chromatography or coimmunoprecipitation: When should someone use one or the other? Posted: 02 Feb 2017 05:41 PM PST I feel like they're both too similar. I can't really imagine a situation best suited for one, because it feels like they essentially perform the same function. Take the following problem, for example:
The answer to this question is Coimmunoprecipitation, using an antibody to precepitate p21 or cdk then using Western Blotting/mass spec. Why can't affinity chromatography be used in this situation instead? Does anyone know any specific examples where one would be a better choice than the other? [link] [comments]  |
| Posted: 02 Feb 2017 09:18 AM PST |
| Could perpetual motion be created somehow in a vaccum chamber with zero gravity? Posted: 02 Feb 2017 06:50 AM PST I feel like without any air resistance or gravity there would be no force to slow down the perpetual motion device. Am I correct? [link] [comments]  |
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