If insects like the Prey Mantis have thousands of eyes, then why do they have pupils? |
- If insects like the Prey Mantis have thousands of eyes, then why do they have pupils?
- At what level of entropy does a system of a given size collapse into a black hole and how much data could be put on a flash drive before it collapsed into one?
- What is the environmental impact of air conditioning?
- Shouldn't time dilation prevent the creation of a black hole?
- Why is the August 21st eclipse going to move from West to East across the United States?
- Ask Anything Wednesday - Engineering, Mathematics, Computer Science
- Could our solar system ever move into a large area of dust?
- If the whole universe was moving in a given direction at close to c, could we detect it?
- Do black holes and crystals exemplify two extremes of entropy?
- What exactly causes Ketchup to behave as a Non-Newtonian fluid?
- Why don't glow-in-the-dark objects release their stored light energy all at once?
- [Mathematics] (Also physics) Why can one define parallel transport without a metric? Is there a proof that it is a diffeomorphism invariant?
- Why when you feel something in your mouth with your tongue does it feel disproportionately large to how it actually is?
- What are the specific mechanisms of heavy metal ions denaturing or inhibiting enzymes?
- How do biologists estimate the population of endangered species?
- Do diamagnets have applications?
- Do Animals have mental illnesses? Are there sociopath animals?
- It seems that cases of indigestion, GERD/reflux, and heartburn are commonplace compared to being seemingly rare 20+ years ago. Is this true? If so, why?
- How did Bekenstein develop the equation of a black hole's entropy?
- Nucleosynthesis via Tidal Breakup of Neutron Stars?
- What is the relationship between M theory, string theory and supergravity?
| If insects like the Prey Mantis have thousands of eyes, then why do they have pupils? Posted: 01 Aug 2017 03:22 PM PDT Is it a big bundle of eyes? And how does it move? In case no one knows what I'm talking about, here's a photo. [link] [comments]  |
| Posted: 02 Aug 2017 05:51 AM PDT I don't exactly understand it, but I recall hearing somewhere that a black hole can be defined as a region in space where entropy has exceeded a certain value. Since entropy is congruent to information, and in light of IBM's new 300TB storage drive, it got me wondering how much data could fit on a flash drive (say 3cc) before it collapsed into a black hole? [link] [comments]  |
| What is the environmental impact of air conditioning? Posted: 02 Aug 2017 08:25 AM PDT My overshoot day question is this - how much impact does air conditioning (in vehicles and buildings) have on energy consumption and production of gas byproducts that impact our climate? I have lived in countries (and decades) with different impacts on global resources, and air conditioning is a common factor for the high consumption conditions. I know there is some impact, and it's probably less than other common aspects of modern society, but would appreciate feedback from those who have more expertise. [link] [comments]  |
| Shouldn't time dilation prevent the creation of a black hole? Posted: 02 Aug 2017 12:01 AM PDT Because of relativity, the effects of time should almost stop at the event horizon. Doesn't that mean that a black hole takes an infinite amount of time to create? [link] [comments]  |
| Why is the August 21st eclipse going to move from West to East across the United States? Posted: 02 Aug 2017 05:58 AM PDT The earth is rotating relatively rapidly in an East to West direction. Both the Sun and the Moon appear, from our perspective, to rise in the East and set in the West. So, how is this possible? [link] [comments]  |
| Ask Anything Wednesday - Engineering, Mathematics, Computer Science Posted: 02 Aug 2017 08:07 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]  |
| Could our solar system ever move into a large area of dust? Posted: 01 Aug 2017 10:08 AM PDT If so would it superheat our planet from all the particles burning up in our atmosphere? [link] [comments]  |
| If the whole universe was moving in a given direction at close to c, could we detect it? Posted: 02 Aug 2017 01:34 AM PDT Something like a Great Attractor for different universes, for example. [link] [comments]  |
| Do black holes and crystals exemplify two extremes of entropy? Posted: 02 Aug 2017 07:47 AM PDT My base understanding is that entropy is a measure of the possible states of all elements in a system. If this is correct, is a black hole system very entropic and a crystal system very un-entropic? Is there anything more extreme than these? Is quantum foam more entropic than a black hole? Does anything exist which is less entropic than a crystal? So many questions... [link] [comments]  |
| What exactly causes Ketchup to behave as a Non-Newtonian fluid? Posted: 02 Aug 2017 06:28 AM PDT Is there a specific ingredient or interaction that causes this behavior? [link] [comments]  |
| Why don't glow-in-the-dark objects release their stored light energy all at once? Posted: 01 Aug 2017 11:48 AM PDT I understand that glow-in-the-dark objects/coatings store light energy by excitation of electrons to a higher orbital, and that when the electron drops to it's base orbital it releases the energy in the form of photons. My question is, why don't the electrons all drop simultaneously when the energizing light source goes away, resulting in a single instantaneous pulse of light, and then darkness? [link] [comments]  |
| Posted: 01 Aug 2017 02:08 PM PDT Hi! So I've been reading about gauge theories and the problem is, normally physics texts just assume all the geometrical data on the spacetime manifold is available. The setup of a gauge theory is a principal bundle E -> M over the spacetime manifold. On my side, I am studying about Chern-Simons theory, which is a topological field theory known to be diffeomorphism invariant. However, the Chern-Simons action depends on the connection form. I have trouble putting these things together: a connection form uniquely defines a notion of parallel transport. However, parallel transport is very clearly not diffeomorphism invariant. I can deform the curve-to-be-lifted however I want, hell, I can even change the start and ending point via diffeomorphisms. This means that the connection form should not be diffeomorphism invariant. So why on earth does the Chern-Simons action define a topological field theory? :D Thanks! [link] [comments]  |
| Posted: 01 Aug 2017 11:45 AM PDT |
| What are the specific mechanisms of heavy metal ions denaturing or inhibiting enzymes? Posted: 01 Aug 2017 01:59 PM PDT I have heard about other metals replacing ligand bonded ions that "belong" in the enzyme originally, and ions attacking disulphide bridges changing the form of the enzyme, as well as just more generic "ion binds somewhere and changes the shape of the active site". Problem is, I can find a lot of places mentioning these things but not too many sources that actually explain what is happening. Which ones are correct? Are there other possible mechanisms as well? Is the disulphide bond mechanism denaturing or just inhibiting the enzyme? Can any heavy metal ion act as a denaturing agent or an inhibitor? Just trying to understand this [link] [comments]  |
| How do biologists estimate the population of endangered species? Posted: 01 Aug 2017 06:46 PM PDT Bonus points for explaining how they estimate marine populations, given how large in every dimension our oceans are. (An article I just read quoted a specialist saying there are "roughly 468 Right Whales" remaining. How do you arrive at such a specific number with confidence?) [link] [comments]  |
| Do diamagnets have applications? Posted: 01 Aug 2017 01:09 PM PDT I've heard that superconductors will be used to levitate certain trains like the Hyperloop to reduce friction. Why aren't diamagnets used? [link] [comments]  |
| Do Animals have mental illnesses? Are there sociopath animals? Posted: 01 Aug 2017 07:55 PM PDT |
| Posted: 01 Aug 2017 09:55 AM PDT It seems that as a 37 year old, growing up, I rarely heard of GERD and reflux. Nowadays, it seems so common. Why is this the case? [link] [comments]  |
| How did Bekenstein develop the equation of a black hole's entropy? Posted: 01 Aug 2017 09:55 AM PDT I've gotten as far as working out the Planck area from dropping single photons into a black hole, but I have no clue how to get from there to entropy. I know entropy is practically without units, but there are many ways I could mess with the formula to create something without units, and it would likely be meaningless. How did Jacob Bekenstein know which way to arrange the formula to describe entropy? [link] [comments]  |
| Nucleosynthesis via Tidal Breakup of Neutron Stars? Posted: 01 Aug 2017 09:51 AM PDT I know that neutron stars contain a lot of nucleons below the surface that aren't bound to a specific nucleus. I also know that a neutron star will break up if it passes too close to a black hole. In such a situation, pieces of the neutron star might be ejected. What would the isotopic composition of the resulting debris look like? Would we see isotopes that are usually too neutron-rich to form? A literature search turned up this conclusion from 1976. "At present it is unclear [what] distribution of heavy elements result, although it seems safe to conclude that neutron-rich heavy elements themselves do result" - Lattimer & Schramm, Astrophysical Journal, vol. 210, page 562 [link] [comments]  |
| What is the relationship between M theory, string theory and supergravity? Posted: 01 Aug 2017 10:18 AM PDT Ok so it was a few years ago and i watched a really interesting documentary about M theory. In it was discussed how string theory and supergravity theory were at odds for a long time with one of the main distinctions being how many dimensions of time and space there were. IIRC they said string theory had for a long time used 10 dimensions wereas supergravity used 11. Then when they used string theory and added to their equations the 11th dimension proposed by supergravity it made a new and much more "elegant" theory wherein instead of strings it became a membrane. Hence the name m theory. When i search tho i cant find this documentary and searching m theory just brings up string theory which i (likely incorrectly) thought had replaced string theory as the prevailing modus operandi in quantum mechanics. Am i wholly incorrect in this thought? If so what is the real relation btwn the 3? Thank you so much in advance and if any one has some recent documentary suggestions on this it would be greatly appreciated. [link] [comments]  |
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