| Why shouldn’t you get the COVID-19 vaccine if you have a cold/flu? Posted: 10 Sep 2021 02:27 AM PDT I've had a bit of a google and the closest answer I can get is that given some people experience mild to severe cold/flu like symptoms after receiving their shot - especially the 2nd shot - is that if you get the vaccine and are already unwell, that you are more likely to feel even worse than if you weren't unwell? Is that correct? And if so, is it the vaccine making your cold/flu symptoms worse or is your cold/flu making the vaccine side effects worse? Thank you, fine people of r/askscience! submitted by /u/Gin-and-turtles [link] [comments] |
| Why is the length of the day "really" 23 hours, 56 minutes, and 4 seconds, instead of 24 hours? Posted: 09 Sep 2021 09:45 PM PDT |
| Hospital staff have always been very careful, but with Covid-19 they are being even more careful. Has this had an impact on other hospital based infections? Posted: 09 Sep 2021 11:12 AM PDT Part of weighing the cost benefit analysis of treatment at a hospital is risk of infection, and risk of infection of particularly resistant bacteria on top of that. Are we seeing the numbers of these other types of infections go down as vigilance for Covid goes up, even though the types of infection are different and have different avenues? submitted by /u/Dr_Wreck [link] [comments] |
| Are people with long covid considered compromised and more susceptible to further disease from covid reinfection, flu, bacterial infection etc? Posted: 09 Sep 2021 03:21 PM PDT |
| Can light be unpolarised? Posted: 10 Sep 2021 07:11 AM PDT If I have a polarised lights source, can I reflect it off something matte (say a carpet) so that it is no longer polarised. Or will the light coming off the object always be polarised? Bonus question. If I send light that is polarised at a perpendicular angle to the polarity of light that will reflect off an object (say a flat piece of plastic) will there be any light reflected off it? Extra Bonus question: what determines whether light will be reflected or absorbed when hitting a piece of flat black plastic? Is it the initial polarity of the light hitting it (perhaps in relation to the polarity of the light being reflected?) submitted by /u/Regispiel [link] [comments] |
| Soil Liquefaction during Earthquakes? Posted: 10 Sep 2021 03:51 AM PDT I'm currently researching soil liquefaction and I was looking for a good illustration. One type of graphic that I found and that comes up a lot on Google images (in various shapes and forms) is this: https://www.scienceworld.ca/wp-content/uploads/qualities-soil.jpg Now, the reason I am here is because, from how I understand liquefaction, this image (and all the similar ones) seem to be wrong (or at the very least misleading). But I'm not an expert so I am a little bit unsure. The way I understand it: Yes, the pressurized water reduces the friction between the sand particles - but the reason the water is pressurized is because the sand gets compressed by the shaking - all the particles get packed much more tightly. This is what results in the increase in pressure and consequently in the reduction in friction. So It seems to make little sense that the first (before) image shows really tightly packed particles while the second(during) imagine shows really loosely packed particles, as if the ground is suddenly 80% water. The caption even states that the earthquake increases the space between particles which I deem to be just flat out wrong. There are other images but graphics similar to the one above dominate google. Here are actually two that I found that I like. https://ars.els-cdn.com/content/image/3-s2.0-B978012814078900008X-f08-01-9780128140789.jpg https://www.geotech.hr/wp-content/uploads/2019/02/likvefakcija_diferencijalno_slijeganje.jpg Because these types of images pretty much contradict each other and I didn't want to fall victim to confirmation bias, I thought I should ask someone more knowledgeable if I'm right to dislike the first one. Thanks for helping. submitted by /u/theftproofz [link] [comments] |
| Is the life-arc of a star determined 100% by its starting mass, or are there other factors involved? Posted: 09 Sep 2021 08:32 AM PDT I understand that there are varying types and sizes of stars (red giants, blue dwarfs, etc.) and that a star can take on multiple "forms" as it ages and the composition of its fuel changes. I understand that the mass of a star defines many of its key attributes, but is a star's lifespan and other features solely based upon its starting mass? Or are there other considerations that determine when and how it changes form? submitted by /u/foodfighter [link] [comments] |
| If photons carry momentum and can change the course of satellites, then why do we not see sunlight knocking items over, over a long period of time? Posted: 10 Sep 2021 02:35 AM PDT Imagine a sunlit room, where the sunlight window constantly shines upon a table of balls or marbles. All else being equal — no one touches these objects, no earthquakes etc — would these objects move or are these objects moving due to the sun's photons? How long? I read that the sun's photons can change the course of satellites (this comment here) and it really confuses me that if it can move satellites, then it should be able to move much smaller objects too. submitted by /u/AvgGuy100 [link] [comments] |
| What do we know about treating long haul covid? Posted: 09 Sep 2021 09:03 AM PDT Personally had covid over a year ago, sickness wasn't too bad, but body doesn't feel like it ever recovered. Previously exercised every day, now i'm plagued by little nagging injuries and pains popping up. Had a neck injury, which has been exacerbated and is sore every day. Cant seem to stay healthy enough to get fit again with constant aches/pains. So my question is what do we know about treating long haul covid? Is it just high inflammation levels? Is there any research into treatments for recovering from long term covid? submitted by /u/drizztbang [link] [comments] |
| Why is hot water better at dissolving/taking the flavor of things? Posted: 10 Sep 2021 04:54 AM PDT |
| Can we be symptomatic after an infection but the infection not be transmissible? (e.g. I have a cold, still bunged up but I know im getting better) Posted: 09 Sep 2021 05:39 PM PDT |
| I just learned that The Moon continues to spin away from the Earth, at the rate of 3.78cm (1.48in) per year. How do scientists measure such a small unit across such a large space? Posted: 09 Sep 2021 07:26 PM PDT I just learned this while watching a solar system documentary and found it fascinating. I can't wrap my mind around how this is possible or reliable. I would have assumed the standard deviations in the fluctuation of orbit would far exceed 3.78cm. submitted by /u/DaDaDaonald [link] [comments] |
| How/why does light behave differently at higher energies? Posted: 10 Sep 2021 02:26 AM PDT Been watching MIT's nuclear engineering course recently and it seems to me that much of the discussion of x-rays and gamma rays was surrounding the amount of matter needed to stop them, without regard to material makeup. This seems very different to the understanding of light I have in the visible spectrum, here we seem to have all sorts of different behaviors depending on the material and chemical makeup of objects, resulting in, reflections, transparency, etc. Does this not apply at all at higher energies? To some extent this also seems to be true at lower energies such as the radio frequencies, interested in that as well. submitted by /u/yalloc [link] [comments] |
| How do some stars accumulate enough mass to become blue supergiants ? Posted: 09 Sep 2021 10:11 AM PDT In descriptions of star formation in stellar nurseries, protostars ignite when they accumulate enough mass to set off fusion reactions in their cores. Once the star ignites, stellar winds "blow away" the gas surrounding them so they're no longer accumulating mass. How does this theory account for the extreme variation in the initial size/mass of stars? It seems like there is a critical mass that, once achieved, causes stellar ignition limiting the size of stars. One would expect there to be a very common maximum size with a tailing off population of smaller, slow growers who only gradually accumulated sufficient mass to ignite submitted by /u/shiningPate [link] [comments] |
| What happens to a star that gathers a lot more hydrogen in the middle of its life cycle? Posted: 09 Sep 2021 11:24 AM PDT As a hypothetical example, a star that is similar in size to our sun and already exhausted about half of its fuel. It's traveling throuout the galaxy, and it moves into a large nebula. If the gravity from that star pulls in significantly more hydrogen and other gasses. Would this extend its life, or would it have the opposite effect? submitted by /u/Necron02 [link] [comments] |
| How do archaeologists remove rust from iron artifacts without damaging it? Posted: 09 Sep 2021 07:29 AM PDT |
| [Astrophysics] How is it that the scattered matter of the "big bang" isn't an even spread across our cosmos and instead, we have enormous stars, small stars, humongous galaxies, and unfathomable voids between galaxies? Posted: 10 Sep 2021 12:09 AM PDT |
| Do all parts of a galaxy complete a rotation in the same amount of time? Posted: 09 Sep 2021 12:13 PM PDT I had heard the interior stars of a galaxy complete an orbit in the same amount of time as the outer starts - contrary to what we'd expect in a spinning disk of independent objects. And that Dark Matter may be the explanation? Can anyone confirm or refute? submitted by /u/drburns650 [link] [comments] |
| How low cortisol affects on your mood? Posted: 09 Sep 2021 09:15 AM PDT I'm currently on the process of investigating on why I have trouble producing cortisol, but due to me getting infeccted by covid-19, this had been postponed, so I wanted to know why even though I have trouble producing the stress hormone I am so stressed. I have generalized anxiety and recently I have been really angry about some stuff, not like angry enough to break material items but a standing anger, since last Friday, and before that I already was experiencing an easyness to be bothered by silly things like specific noises. Is this normal? Wasn't I supposed to be more chill due to my lack of cortisol? submitted by /u/alastagiel [link] [comments] |
| Do photons emitted by charged particles carry information about the charge of the particle that emitted them? Posted: 09 Sep 2021 07:18 PM PDT My mental ASCII Feynman diagram of a two-electron interaction looks like this: \e- /e- ^ ^ \ / +~~+ / \ ^ ^ /e- \e-
In case this gets horribly butchered on your device: you've got two electrons coming in, they exchange a photon and they fly off in other directions happily ever after. My question is what changes happens to the photon when you switch one of the e-'s for an e+, a positron? What causes the oppositely charged particles to attract, and like charges to repel? What makes photons emitted from an electron repel other electrons, but attract positrons? The interaction nodes could be arbitrarily far away. I'm guessing I'm completely misunderstanding this Feynman diagram as an oversimplified space-time diagram. Or does the photon carry more info than 'I'm a photon'? submitted by /u/yatima2975 [link] [comments] |
| Does English have a particularly large amount of influence from foreign languages, or do most languages share a similar amount of languages they draw words from? Posted: 09 Sep 2021 06:11 AM PDT I.E. is the proportion of words in English not directly inherited from closely related languages (various Germanic languages, in this case) particularly high, or is it normal for different languages to draw words from so many others? This question was inspired by finding out "schmuck" is from Yiddish. submitted by /u/_deltaVelocity_ [link] [comments] |
