| What is the incubation time of the corona virus? Posted: 29 Dec 2021 03:31 AM PST Two years ago it was explained that the great danger of covid was the long incubation of roughly two weeks between infection and outbreak/symptoms. So you would go around and spread it without realizing you were carrying it. How is the situation now, especially regarding the new variants? Is the incubation time more precise now? Googling this info gave me a headache. Just too much about this topic. Any input if we are at the same spot as two years ago or more advanced is much appreciated! submitted by /u/SpaceJinx [link] [comments] |
| How was cancer treated in the 1930s or 1940s did the treatments work or did you just die? Posted: 29 Dec 2021 01:33 AM PST |
| How does my brain understand where pain is spatially located? Posted: 29 Dec 2021 04:01 AM PST Hi, I understand the basics of how pain and nervous system work: when something bad happens, our nerves fire pain signals. However, the thing that eludes me is: how does brain know where the pain is spatially located? For example, when my stomach hurts, I usually can point at the location of the pain, I can feel in what part of stomach the pain is localized. As far as I understand and my basic logic tells me, the brain needs to know where certain nerve endings are located spatially, the mapping of nerves and organs and the mapping of organs and their locations in my body. Does the brain learn the mapping when we grow up? Or is there another way of localizing of pain? How does the brain know where, e.g., my stomach is located spatially in my body? I honestly tried googling, but can't seem to find anything remotely helpful. Maybe someone can point me in the right direction what I can read about to understand the answer to my question (e.g., how is this phenomena called)? submitted by /u/gnomeweb [link] [comments] |
| When we shine a light through coloured plastic/cellophane, the light projected assumes that colour. Does this mean that the photons themselves are being coloured as the pass through the plastic? Posted: 29 Dec 2021 03:04 PM PST |
| How does a nuclear reaction actually begin? Posted: 29 Dec 2021 10:57 AM PST In a nuclear reactor, how do they get the uranium 235 to actually begin fission? I've tried to find out how but have no idea. I understand that you need a neutron to hit an atom of U235 which then splits into fission products and an average of 2.45 neutrons, but where does the first neutron come from? Do we just stick the material into a moderator I.e. water, and let stray neutrons slowly begin the reaction then use the control rods to slow it down once it's going? Or do we inject a big spike of neutrons to begin the reactions? What goes on when we need to restart the reaction? submitted by /u/Dannycrew106 [link] [comments] |
| What types of liquids can form oceans on planets? Posted: 29 Dec 2021 06:19 AM PST |
| Can explosives be detonated with sound waves? Posted: 28 Dec 2021 05:59 PM PST Can explosive compounds be agitated via sound waves (or really any type) so as to result in an explosion? If not, then why? Edit: ultimately I'm curious if, in the future, sound waves could be used to detonate minefields. submitted by /u/whereslyor [link] [comments] |
| Are there viruses that find sources of energy outside of cell synthesis (like eating) or are they created with a set amount of energy and must replicate before they "die"? Posted: 28 Dec 2021 02:25 PM PST |
| Ask Anything Wednesday - Economics, Political Science, Linguistics, Anthropology Posted: 29 Dec 2021 07:00 AM PST 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! submitted by /u/AutoModerator [link] [comments] |
| Is there a difference in how energy is transferred due to AC current vs DC current? Posted: 29 Dec 2021 02:29 PM PST I was just watching this video about how capacitors work and the guy mentions at the end that the energy flow in a circuit isn't the kinetic energy of the electrons but the energy from the Pointing vector, which is perpendicular to both the E and B fields. I asked him for clarification in the comments, saying I thought it was because EM waves are transverse waves and he said that could work for AC but not DC, since there's no oscillation in the field with DC circuits and that he actually wasn't sure what the energy transfer mechanism is for DC current. So now I'm confused. IS the energy transfer from electricity normally a result of EM waves? It seems like it has to be, because waves inevitably transfer energy, and I see no other mechanism for energy transfer in this context, if it's not the kinetic energy of the electrons. But how can it be for DC circuits, since, as the YouTuber said, the field doesn't oscillate due to DC current. submitted by /u/dcfan105 [link] [comments] |
| Who was the first person who discovered that moon has reflected light? Posted: 29 Dec 2021 05:36 AM PST I already searched on google but couldn't find any source. Some say that it was leonardo da vinci, and some say that it was Anaxagoras. submitted by /u/skepticSapien [link] [comments] |
| How do interrupt handlers get context about what caused the interrupt? Posted: 28 Dec 2021 08:48 PM PST I've been reading about interrupts in a general sense and I understand the concept of devices or programs triggering an interrupt, which is handled by an interrupt service routine. What I don't understand is how the interrupt handler knows what exactly happened beyond "this device requested an interrupt". By "context" I mean something like pressing 'K' on a keyboard as opposed to the space bar. The keyboard sends an interrupt request to the to a hardware pin but how does that tell the computer which specific key was pressed? submitted by /u/TechnophiliusP [link] [comments] |
| What's the peak timeframe after a stroke when its most likely to show up on an MRI? Posted: 29 Dec 2021 08:29 AM PST Non-native English speaker here. Does someone have a graph that shows the peak time range when strokes (or TIAs) are most likely to show up on an MRI? And the time range where the stroke (or TIAs) are least likely to show up. submitted by /u/Experimentalphone [link] [comments] |
| Since the James Webb Telescope is collecting very low quantities of light, how do they decide where to point it? Posted: 29 Dec 2021 06:06 AM PST |
| When archeologists find a fossil millions of years old, how do they determine its age if carbon dating has a limit of ~60,000 years? Posted: 28 Dec 2021 08:03 PM PST |
| Does mRNA based protein synthesis happen at the same rate for everyone for a given volume of mRNA? Posted: 29 Dec 2021 09:38 AM PST I am just like fascinated by the advancements with vaccines that Covid brought. So, the Covid mRNA vaccines I understand are mRNA encapsulated with nano lipids. Cells ingest them, the golgi apparatus takes in the package, ribosomes begin reading the mRNA and translating it to amino acids. At some point the mRNA degrades. This is all my layman understanding. People have different reactions to the vaccine. It is normal, and just an immune response, it is safe and tested etc. Science effectively hijacked a specific process that happens anyway with a traditional vaccine with attenuated viruses or infection. Are people effectively getting different doses of the payload, though, where the end result is spike proteins being produced? Can people be more or less efficient at transcribing mRNA? Or does a given volume of mRNA always result in the net same amount of protein synthesis? Could that partially explain why people react differently? submitted by /u/d13f00l [link] [comments] |
| Why do thinly cut foods stay hard when boiled but thicker cuts go soft? Posted: 29 Dec 2021 07:34 AM PST First time father here. I've noticed when stewing/boiling apples or carrots, the ticker I cut them, the softer the get when boiled. Anyone know why? submitted by /u/Consequations [link] [comments] |
| Geologists and earth scientists here, what does it mean to say that a place is 60 m high from sea level? Can we dig that and get the actual sea? Posted: 28 Dec 2021 06:41 PM PST Context: I am from Nepal and it is a landlocked country with no sea or ocean. The lowest point on our geography is 59 m above sea level and i was wondering if we could dig a 60m deep hole and have sea water. I looked up The deepest hole and found it was 7 km deep. Surely it is possible to dig 60 m. Has it ever been done before? submitted by /u/Salty_Constant_9878 [link] [comments] |
| What are the chances of the James Webb Space Telescope being struck by space debris? Posted: 28 Dec 2021 08:12 PM PST The JWST launch has been so captivating! Its construction seems so delicate given the precision its measurements will require, though. What are the chances it sustains non-insignificant damage due to colliding with space junk over the course of its mission? submitted by /u/Soontaru [link] [comments] |
| What's the point of rocket fuel in space? Posted: 28 Dec 2021 12:54 PM PST Ignoring everything else, and just looking at the third law of motion, then what's the point of using combustion in space? Couldn't you just use hydrogen tanks that could just open and let the vacuum of space drag it out and create forwards motion? I mean, lighting the fuel just seems like an awful waste of energy going into heat instead of kinetic energy What is it that I don't get? submitted by /u/xXugleprutXx [link] [comments] |
