AskScience AMA: We are scientists in the food and feed laboratories that test imported products for dangerous pathogens as well as illegal dyes, metals, antibiotics and more. Ask us anything! |
- AskScience AMA: We are scientists in the food and feed laboratories that test imported products for dangerous pathogens as well as illegal dyes, metals, antibiotics and more. Ask us anything!
- Do super massive stars have a goldilocks zone?
- Are all black holes the same density?
- If we let a laptop on the ISS "freefall" and put a CD in the disk drive, would the laptop start spinning?
- Would an explosive missile be effective in space? Moreover, would concussive blasts have any effect?
- Why is solving a problem in 2D often "harder" than solving it in 3D?
- If I had a very fast and accurate camera, could I see a speaker cone move sample by sample?
- Ask Anything Wednesday - Economics, Political Science, Linguistics, Anthropology
- How are methanogens able to produce energy?
- What does the overlap between the Wavelength ranges of different EM types mean for individual photons?
- What would a highly curved universe look like to an inside observer?
- Have there been any studies done on the effects of flushable wipes on the environment?
- Would I experience higher gravity at the top of a mountain or at the bottom of an ocean trench?
- We have harnessed kinetic and light energy (wind,sun) for our use, why have we not yet harnessed heat energy, from say volcanoes?
- Does anyone know what this is? It looked like an ECG strip running across the sky.
- How is it possible that we know of only a few (<20) species that engage in sex for pleasure, yet we have extensive lists of species that exhibit homosexual behavior?
- Is it possible to dehydrate an egg white without it denaturing?
- Does the speed of sound in water increase at high pressures?
- could there be another planet in our solarsystem?
- How big is the Asteroid Belt and how did it form?
- Where does the ultraviolet region of the spectrum Reeaaally start?
| Posted: 30 Mar 2016 04:37 AM PDT We are scientists at state food and feed laboratories. Among other things, we test products imported into the US for dangerous pathogens as well as illegal dyes, metals, antibiotics and more. In addition, we work with the Association for Public Health Laboratories (APHL) to assist food and animal feed testing laboratories to achieve, enhance and/or maintain accreditation to ISO/IEC 17025:2005. This accreditation is key to creating a national integrated food safety system. Accreditation Support for Food and Animal Feed Testing Laboratories Want to hear more about our work and the fascinating things we've come across? We will be back at 10 am EST (7 am PST, 3 pm UTC) to answer your questions, Ask us anything! We are: Cynthia Mangione, BA Food Laboratory Specialist 2 – Microbiology QAO Food Laboratory Division New York State Department of Agriculture and Markets Proof Stephanie Brock, BS Radiation Health Supervisor Radiation/Environmental Monitoring Section Kentucky Department for Public Health Proof Edit: Our colleagues had various emergencies and are unable to participate today. Yeah, we're disappointed too. We do have some others on speed-dial if we need to phone a friend! Hopefully we can still answer all the questions you have and/or point you in the right direction. Edit: We're live! Thanks for having us! [link] [comments]  |
| Do super massive stars have a goldilocks zone? Posted: 30 Mar 2016 04:06 AM PDT And if so, how long would a year be on a planet within the zone? [link] [comments]  |
| Are all black holes the same density? Posted: 30 Mar 2016 04:22 AM PDT |
| Posted: 30 Mar 2016 04:17 AM PDT In fact, do we need a CD? Would the internal hard drive be enough to spin the laptop on its own? [link] [comments]  |
| Would an explosive missile be effective in space? Moreover, would concussive blasts have any effect? Posted: 30 Mar 2016 03:52 AM PDT Basically, a friend and I were talking about Sci-fi writing, and space combat therein. Thinking about the weapons used against each other I thought about missiles and confounded myself with the question in the title. On the one hand, space is a vacuum, so there is no medium to convey the concussive force. But on the other hand, an explosive missile would create is own medium to convey the concussive force. Over a great distance, it would surely be less effective than in air, inverse square law etc as the gas expands. But in close proximity....would the pressure difference between the vacuum of space and the explosion actually cause the missile to be more effective? I'm probably missing something hilariously obvious, but now I'm curious. [link] [comments]  |
| Why is solving a problem in 2D often "harder" than solving it in 3D? Posted: 29 Mar 2016 08:53 PM PDT For example, in my PDEs class we were able to derive the spherical means formula for the solution of the wave equation in 3D with a couple changes of variables and a little bit of work. But to derive it in 2D, we had to embed the problem in 3D but make it uniform across one of the spatial coordinates. This example in particular raises my question because it seems the obvious answer to my question is that 1D and 3D are somehow more "alike" than 1D and 2D because they are both odd dimensions, but the 1D spherical means formula (D'Alambert's solution) seems to share features of both the 2D and 3D cases, in that the 2D formula involves only averages over balls, the 3D formula involves only averages over spheres, and the 1D formula involves an average over a sphere and an average over a ball. I've also encountered this sort of situation in my statistical mechanics class. I forget what exactly we were deriving, but I believe it was something to do with magnetization and the expressions in 1D and 3D involved only hyperbolic trig functions while in the 2D case we encountered Bessel functions. [link] [comments]  |
| If I had a very fast and accurate camera, could I see a speaker cone move sample by sample? Posted: 29 Mar 2016 10:27 PM PDT Let's assume we're playing CD audio through a speaker. Would each sample of the waveform be detectable as pauses or slowdowns of the cone? Sense suggests there would be capacitors "smoothing out" the waveform at higher frequencies, but surely some effect could remain? [link] [comments]  |
| Ask Anything Wednesday - Economics, Political Science, Linguistics, Anthropology Posted: 30 Mar 2016 08:02 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! [link] [comments]  |
| How are methanogens able to produce energy? Posted: 30 Mar 2016 07:25 AM PDT First, I am biochemist (considering myself one as I am in my last semester of undergraduate education) so feel free to answer as technically as you are willing. I know essentially nothing about methanogens, but I am just curious how they are able to produce energy by reduction of CO2 to methane since this should involve putting in more energy than you receive from breaking C-O bonds. I believe they don't perform photosynthesis or something similar right? So they couldn't be getting energy from light as in plants. Thanks for the answer! [link] [comments]  |
| Posted: 29 Mar 2016 01:27 PM PDT This is something I've been confused about for quite a while. According to this image, there's overlap between the ranges of different types of EM radiation. So for example, from ~10-12 m to ~10-9 m, the ranges of gamma rays and x-rays overlap. Does that mean that all photons with wavelengths of (for example) 10-10 m display properties of both gamma rays and x-rays, or does that mean that some photons with wavelength 10-10 m are gamma ray photons, and some are x-ray photons? Considering what I know about the various possible properties of photons, I'm guessing it's the former, but I've never seen it explained and I wanted to be sure. [link] [comments]  |
| What would a highly curved universe look like to an inside observer? Posted: 30 Mar 2016 05:12 AM PDT This might be more of a mathematics question than a physics question. Under the FLRW model there are two possibilities for a non-flat universe: positive curvature (3-sphere) or negative curvature (hyperbolic space). Let's assume a fixed static metric for simplicity, that the universe has existed forever, and that the curvature is high enough to be noticeable. Reasoning by analogy with the two dimensional case, I'd expect far away objects in the sphere to look bigger than in flat space, eventually covering all your field of vision when the object is at the antipode. Also, I think you would see an (inverted?) image of your back in the background at all times. In contrast, objects in the hyperbolic space would look much smaller than in flat space the further they are, since parallel lightrays eventually diverge. Is this correct? Or are there other effects due to the finiteness of the speed of light? Does anything interesting happen if the observer is moving at relativistic speeds, and/or if we include a slight metric expansion? I'm basically trying to get a feel for the global aspects of the geometry from the perspective of someone inside. [link] [comments]  |
| Have there been any studies done on the effects of flushable wipes on the environment? Posted: 30 Mar 2016 04:27 AM PDT |
| Would I experience higher gravity at the top of a mountain or at the bottom of an ocean trench? Posted: 29 Mar 2016 02:18 PM PDT In this question I am assuming that we are on earth, that the trench and mountain are the same displacement from sea level and that the rock around it is consistent density. Would this change depending on the height of the mountain/trench or the density of the body that I am standing on? [link] [comments]  |
| Posted: 30 Mar 2016 03:33 AM PDT |
| Does anyone know what this is? It looked like an ECG strip running across the sky. Posted: 29 Mar 2016 02:22 PM PDT |
| Posted: 29 Mar 2016 10:36 PM PDT I was under the impression that homosexual activity and sexual intercourse for pleasure went hand in hand. Sources (Is Wikipedia okay?): [link] [comments]  |
| Is it possible to dehydrate an egg white without it denaturing? Posted: 29 Mar 2016 12:36 PM PDT And thus effectively isolate the proteins within? If this is not possible is there another way of isolating the proteins? [link] [comments]  |
| Does the speed of sound in water increase at high pressures? Posted: 30 Mar 2016 01:28 AM PDT Okay, here's my question and some thoughts: 1) Speed of sound in fluids= sqrt of (bulk modulus/density) 2) Water isn't very compressible. Even at high pressures the density doesn't increase very much. 3) I've read somewhere that the bulk modulus of water increases at high pressures. So my question is, does the bulk modulus increase by such an amount under high pressure that it isn't significantly compensated by increase in density leading to overall significantly higher speed? [link] [comments]  |
| could there be another planet in our solarsystem? Posted: 29 Mar 2016 10:11 AM PDT if there was a planet, wich shares our path around the sun with the same speed, but allways half a rotation away, could we detect it? is it even possible to have two planets sharing the same path? if so, would we have noticed that by now? excuse my bad english, it is not my first language. [link] [comments]  |
| How big is the Asteroid Belt and how did it form? Posted: 29 Mar 2016 02:02 PM PDT I was recently linked to a doozy of an article. While this article is filled with all kinds of conspiracy theories, wild speculation, and little science, I wanted to investigate one of its claims. Within the article, it claims that the Asteroid belt between Jupiter and Mars was formed by some kind of ancient planetary collision, which the article states was between a primordial planetary body and a moon of the Planet Nibiru (A.K.A., the dreaded Planet X). While its claims about Nibiru are wild, it made me realize that I have no idea what formed the Asteroid belt in the first place. What did form the Asteroid belt, was it the result of a massive planetary breakup? My other question was how big is the Asteroid Belt, really? Are there any estimates of the total mass of the bodies therein? Surely, any potential collision would have had to be between two massive rocky planets to produce a debris field as large as the Asteroid Belt, to say nothing of the uniformity which I think the Asteroid Belt has. [link] [comments]  |
| Where does the ultraviolet region of the spectrum Reeaaally start? Posted: 29 Mar 2016 02:27 PM PDT OK, so textbooks will obviously all say it's at 400nm. But let's be serious, 400nm is just a nice round number. UV radiation is ionizing, right? So if E = hv and we can calculate the energy of the light based on the wavelength, what is the energy needed to ionize "a bond"? And then which bonds are relevant? It seems to me that you should be able to ionize some bonds using visible light, so which are the bonds that we should be concerned about when determining whether something is "UV" or not? Thanks in advance for your help! [link] [comments]  |
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