- A person died in the apartment below me, and the body stayed there for 3 weeks. Why is the smell not leaving the walls/furniture, and why is that smell still occuring without the body? What are those chemicals? Are those chemical "sticking" to materials the same way it does for urine?
- If gold is a worse electrical conductor than silver and copper, why are gold plated contacts considered "better" by the market?
- I read that scientist reversed time in a quantum computer, what does that mean?
- How big do people from "pygmy" groups get when raised with a post-scarcity diet?
- What is soil liquefaction and how does it work ?
- How much power does it take to drive an LCD display?
- What molecular structure binds ATP as a cofactor to an enzyme?
- How are noble gases collected?
- When a star is being formed, how big is it physically right before nuclear fusion occurs?
- How can the electric field of a uniform volumetric charge density be in a particular direction?
- Is there any shape that's impossible to calculate the area of?
- How does the blood-brain barrier in humans not get clogged up with molecules bigger than what can fit through?
- Do other mammals get aroused by watching other members of it's species have sex, similar to humans and pornography?
- Is there any way to create light without heat?
- How do high temperatures kill pathogens on a physical level?
- Why does adsorption in a lattice favour the ions of its constituents, like AgI adsorbing I- or Ag+ ions preferentially?
- Ask Anything Wednesday - Engineering, Mathematics, Computer Science
- [Physics] Why is it important we know the structure of molecules?
- With the innumerable amount of objects in the vast expanse of the observable universe, and our current/near-future technology that allows us to see and study such long distances from Earth, how do astronomers decide what to study first?
- (Myrmecology/Entymology) Is ant behavior contextual? Do ants react to life-threatening situations differently based on hive strength/health?
- How does an anti-inflammatory medicine target where to work in the body?
- Where does rabies lyssavirus actually originate from?
| Posted: 14 Mar 2019 04:26 AM PDT |
| Posted: 13 Mar 2019 10:26 AM PDT I've always wondered if this is just a marketing thing, but all across the electronic supply spectrum I see "gold plated" listed as the best conductors for various contacts and connectors. However, silver is considered the most conductive element (6.2×107 S/m), followed by copper (5.9×107 S/m), with gold (4.5×107 S/m) being third. I get that any of those are better conductors than the most common (tin and steel) but I would think silver, being less expensive, more abundant, and a better conductor, would be preferred over gold. What am I missing here? Source for conductivity values Edit: Asked and answered, just like that. I have no idea why oxidation didn't even enter my mind but regardless, thanks Reddit! Edit 2: My first ever gold, on a post about gold. M E T A. Thanks anonymous Redditor! Edit 3: First gold, now silver...is there a Reddit Copper to complete the trifecta? Thanks! Final edit I promise: Thank you to all of you who are making me feel better about missing the obvious answer. Also, thanks to the anonymous Platinum donor! Hey, speaking of which, platinum is a decent conductor too... [link] [comments]  |
| I read that scientist reversed time in a quantum computer, what does that mean? Posted: 14 Mar 2019 12:46 AM PDT |
| How big do people from "pygmy" groups get when raised with a post-scarcity diet? Posted: 14 Mar 2019 05:18 AM PDT It's known that human stature is a product of both genetics and diet/upbringing. There are various peoples throughout the Earth who are considered to be "pygmies" where the men barely reach five feet, in Africa and Southeast Asia. Most of these people I imagine are raised with a traditional diet, and I was wondering if it's known how big they get if raised with a Western diet and lifestyle, the kind that leads to second-generation immigrants in North America being a head taller than their parents. [link] [comments]  |
| What is soil liquefaction and how does it work ? Posted: 14 Mar 2019 05:13 AM PDT I saw this post on r/gifs where the ground was acting like water but was actually dirt. I was wondering how this kind of effect happen and what are the consequences. [link] [comments]  |
| How much power does it take to drive an LCD display? Posted: 14 Mar 2019 04:56 AM PDT Not counting the backlight, signal processing, etc. how much power is needed to change the state of a single LCD pixel? What about to keep it in the same state? How does this scale to larger displays? [link] [comments]  |
| What molecular structure binds ATP as a cofactor to an enzyme? Posted: 14 Mar 2019 04:54 AM PDT Like my title reads I am wondering what makes enzymes bind ATP to use during phosphorylation as a cofactor? There are 2 hydroxal groups, are they drawn by hydrogen bonds to the enzyme? What draws the adenosin to the enzyme? What makes the AMP post phosphorylisation leave the enzyme? When I asked my teacher she said that specific pocket contained phrolin but she wasn't sure. If you have any recommendations on where to read more about ATP please let me know. Best regards SomeCynicalNihilist [link] [comments]  |
| How are noble gases collected? Posted: 14 Mar 2019 01:33 AM PDT I understand how some elements are collected, like hydrogen, which is collected from water. Or some of the heavy ones that are just synthesized by heavy bombardment. But how do you accumulate lots of helium, neon, or some other noble gas? [link] [comments]  |
| When a star is being formed, how big is it physically right before nuclear fusion occurs? Posted: 13 Mar 2019 06:28 PM PDT |
| How can the electric field of a uniform volumetric charge density be in a particular direction? Posted: 13 Mar 2019 11:36 PM PDT There's a real interesting problem in Griffith's Introduction to Electrodynamics that's tripping up me. Assume there's a field E = axî, where a is constant. curlE = The infinite volume integral of a constant charge density in Coulomb's law just diverges, right? Normally I'd think we need a symmetry argument to determine this kind of field. Since a constant ρ is rotationally and translationally symmetric in all 6 d.o.f., that tells me E 's gotta be uniformly [link] [comments]  |
| Is there any shape that's impossible to calculate the area of? Posted: 13 Mar 2019 11:48 PM PDT When calculating the area of a weird shape, what you normally do is break it up into easier shapes to work with, like triangles, squares, etc. I'm not aware of any other way you can calculate the area of more irregular shapes. So is it possible to create an irregular shape that is impossible to break up into other shapes, making it impossible to calculate the area of that shape? [link] [comments]  |
| Posted: 13 Mar 2019 04:55 PM PDT |
| Posted: 13 Mar 2019 07:47 AM PDT |
| Is there any way to create light without heat? Posted: 14 Mar 2019 12:43 AM PDT And if so is there any way I could rub my hands together and create light without burning my hands? [link] [comments]  |
| How do high temperatures kill pathogens on a physical level? Posted: 13 Mar 2019 12:49 PM PDT What happens to the germ on a small scale, do the hot air or water molecules rip the germ apart? Do they shoot through the walls of the germ? [link] [comments]  |
| Posted: 14 Mar 2019 02:17 AM PDT |
| Ask Anything Wednesday - Engineering, Mathematics, Computer Science Posted: 13 Mar 2019 08:11 AM PDT Welcome to our weekly feature, Ask Anything Wednesday - this week we are focusing on Engineering, Mathematics, Computer 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! [link] [comments]  |
| [Physics] Why is it important we know the structure of molecules? Posted: 13 Mar 2019 11:40 PM PDT I was reading about the synchrotron science facility 'Diamond Light Source' and read that there, they use diffraction patterns to figure out the structures of things such as proteins. What is the significance of this kind of work? Bonus if someone can go into detail about the process. Thanks in advance. [link] [comments]  |
| Posted: 13 Mar 2019 12:14 PM PDT With so many potential objects/areas to study, and a limited number of observatories/powerful telescopes, how do scientists decide where to start? What gets priority? Is there a systematic approach to scanning, studying, and mapping the universe? Is someone in charge of doing a "general sweep" of the cosmos and identifying potential important areas of study? Sorry if something similar has already been asked. Thanks! [link] [comments]  |
| Posted: 13 Mar 2019 12:08 PM PDT Do ants change their behavior in-the-moment based on broad contextual issues like hive health? (To clarify: question is not whether they collect different resources or perform different duties based on hive needs. Although if you have information on that I'd be very interested in the manner of transmission. Really anything about ant behavior.) We have a pretty serious ant situation in my house, and we've tried a number of... solutions. We've deployed the chalk they don't like walking over, spray-on pesticides and those long-delay poison traps. I think I've noticed a contextual attitude change in the ants, but I'm wondering if I'm just making it up. It seems like the ants I discover after a particularly successful decimation of a hive are more likely to scatter at "threatening" signs like changes in light and vibrations, and run for longer. By contrast, when the hive is thriving and numerous, there are more "exploratory" ants who are more bold when similar prompts happen. Am I making up the difference? Or do ants have a sense of what the status of the hive is and respond in kind? I believe they change their tasks based on need (e.g. food, water, protection), but I'm specifically interested if whether or not the impulse for self-preservation is changed based on hive context? Having been in the Air Force, I think of it kind of like Force Protection Condition levels -- security protocol set base-wide to indicate the likelihood of an attack. Obviously ants don't have a daily briefing, but do they have a "hive health awareness" that basically tells them, "Alright gents, we lost half the hive yesterday to that unknown illness, so be careful out there! You see something, you run away!" versus "Gents, we're doing great -- more food than we know what to do with, and lots of babies -- the hive is at full strength and if you see something danger, be stupid!" [link] [comments]  |
| How does an anti-inflammatory medicine target where to work in the body? Posted: 13 Mar 2019 12:47 PM PDT If we get inflammation in any body part, for whatever reason, we take an anti-inflammatory medicine. A small example might be tooth extraction or inflammation on toes due to cold. How does the medicine know which body part to target and reduce the inflammation? Doesn't it harm the overall body by trying to reduce "inflammation" globally? [link] [comments]  |
| Where does rabies lyssavirus actually originate from? Posted: 13 Mar 2019 05:15 PM PDT I am wondering where the rabies lyssavirus originates from. Obviously the mode of transmission is via being bitten by an animal already carrying the disease, but that animal itself got bitten by a rabid animal and so on, so how can we trace it back to where it actually comes from? [link] [comments]  |
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