Since a light sail is pushed by photons, can a laser propel itself through space by emitting photons? |
- Since a light sail is pushed by photons, can a laser propel itself through space by emitting photons?
- Does DNA change over time?
- Why was there Pangea?
- Why does cold temperatures dry clothes?
- What do we know about the variation in the duration of a year throughout Earth's history?
- Is there a building pressure within the earth that’s causing volcanos to erupt?
- What happens to the energy that light loses by red-shifting?
- Could we tell if a black hole was accreting large amounts of dark matter?
- In the interest of not perpetuating misconceptions, what is the ACTUAL mechanism behind osmosis?
- What happens to the Sars-CoV2 virus when the body's immune system or the vaccine fights it off?
- Are there any advantages to conducting research with cell lines derived from aborted fetal tissue compared to using cell lines that are not derived from aborted fetal tissue?
- What is the difference in symptomatic response time between two individuals exposed to SARS-CoV-2, one who is vaccinated and the other who is not?
- When did we learn where vaccines should be given?
| Posted: 01 Oct 2021 10:03 PM PDT |
| Posted: 02 Oct 2021 07:07 AM PDT Does the human DNA genome change as a person ages? By this I mean could you test the DNA of a child and get an exact full profile match to the same person when they have reached old age? [link] [comments]  |
| Posted: 02 Oct 2021 07:35 AM PDT Pangea being one theorized supercontinent where all of the land used to be one giant land mass. But why was this the case at one point, and what about prior? The earth was one giant fireball and cooled before water came and made oceans, so why did the land all clump together, why not spread out similar to what we have today? Was there a point pre-Pangea where this was the case? I liked the idea of Pangea when I was a high school freshman, but it doesn't make sense that the land would "start out" together like that. [link] [comments]  |
| Why does cold temperatures dry clothes? Posted: 01 Oct 2021 11:24 PM PDT In a rainy day, if I leave wet clothes in a bedroom with a heater, they will dry. And if I leave wet clothes in a bedroom with cold air conditioning it will dry. Why? [link] [comments]  |
| What do we know about the variation in the duration of a year throughout Earth's history? Posted: 01 Oct 2021 09:55 PM PDT I am aware that the duration of a day has changed throughout Earth's history (Earth's rotation is slowing down). But what do we know re. the duration of the year? Say, since 4 Gya Namely:
[link] [comments]  |
| Is there a building pressure within the earth that’s causing volcanos to erupt? Posted: 02 Oct 2021 04:30 AM PDT The La Palma and Kilauea volcanos are erupting at the same time. I'm wondering there is some pressure within the earth that's trying to escape and if maybe we should expect to see more volcanos erupting, or the intensity of these two increase. [link] [comments]  |
| What happens to the energy that light loses by red-shifting? Posted: 01 Oct 2021 09:47 AM PDT So, possibly this is a fundamental misunderstanding of mine, but I have been asking myself what happens to the energy that light loses as it red-shifts? It is my understanding that in astronomy one can estimate the distance of an object by its red-shift, or the increase of the wavelength of electromagnetic radiation because of the expansion of space between the object and us (the observer). So, since light with a shorter wavelength carries more energy than light with a longer wavelength and energy can't be destroyed, where does the engery difference go? [link] [comments]  |
| Could we tell if a black hole was accreting large amounts of dark matter? Posted: 01 Oct 2021 08:58 PM PDT |
| In the interest of not perpetuating misconceptions, what is the ACTUAL mechanism behind osmosis? Posted: 01 Oct 2021 09:49 AM PDT Today I found out that the mechanism behind osmosis is talked about as an area of widespread misconceptions. I'm pretty keen on getting it right, especially since it's a concept I teach my biology students. After reading this paper and this paper (although nearly all of the math was lost on me), here's where I'm at: 1) Is osmosis just simple diffusion of water? Well, according to the literature, osmosis can transport water across a membrane faster than simple diffusion could, so then, no? 2) Is osmosis driven by a low relative concentration of water on the solute-rich side of the membrane? Apparently not, because the literature says that you can have water move up its own concentration gradient. The explanations for when and how this occurs are a bit opaque, but my understanding is that some solutes actually break up the intermolecular structure of the water such that the distance between the water molecules decreases, despite the extra volume taken up by the solute molecules? 3) Is osmosis instead driven by attraction between solute and water? This one I've come across a lot, including in answers here on reddit. But it's also listed as a common misconception. I can't tell whether that's because it's plain wrong, or just insufficient to account for the forces involved. 4) The "true explanation" according to both of the linked sources, as far as I've understood it: because solute molecules can't pass the membrane, they're constantly bouncing against it, and hence bouncing back against the water molecules in the solution — so the solute conveys a force from the membrane to the water, directed away from the membrane. But water molecules can still freely diffuse across the membrane from the other side, so this ends up being the net direction of force. This explanation is still not entirely satisfying to me, though. It seems to me that water molecules from the low-solute-concentration side of the membrane would be just as likely to hit a solute molecule headed towards the membrane as a solute molecule headed away from the membrane. (NOTE: I realize there are other solvents than water, but goddamn if solute and solvent aren't frustratingly similar words, so I went with water.) [link] [comments]  |
| What happens to the Sars-CoV2 virus when the body's immune system or the vaccine fights it off? Posted: 01 Oct 2021 06:19 PM PDT Are we actually eradicating the virus if we recover from COVID? [link] [comments]  |
| Posted: 01 Oct 2021 04:54 PM PDT |
| Posted: 01 Oct 2021 07:30 AM PDT Suppose two individuals are exposed to SARS-CoV-2 and become infected at the same time. Would we expect to see the unvaccinated or vaccinated individual showing symptoms first? My own hypothesis is that the vaccinated individual would have an immune response first, but Google isn't really helping me here. I'd prefer scientific studies and research relating to Covid-19, but any research indicating the difference in immune response between vaccinated and unvaccinated individuals for any disease would help me. Edit: I realize I should probably elaborate why I think the vaccinated person would show symptoms first. All things being equal, if the only difference between these two hypothetical individuals is that one is vaccinated and the other isn't, the reason I believe the vaccinated individual would develop symptoms first is because their body would recognize the virus quicker and mount an immune response sooner. However, I am very ignorant in this topic so I'd like some clarity and research to learn more. [link] [comments]  |
| When did we learn where vaccines should be given? Posted: 01 Oct 2021 09:39 AM PDT |
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