What drives the movements of tectonic plates? |
- What drives the movements of tectonic plates?
- For COVID, What is the range of times from "below the PCR LOD" to onset of fever?
- If the symptoms of flu(fever, coughing) are from the immune response, rather than the virus. Why don't we get flu like symptoms after a flu vaccine?
- Can an Alpha Process be replicated in a lab or a fusion reactor?
- How Long Does Sunscreen Protect You For?
- Do species that live shorter life spans evolved faster?
| What drives the movements of tectonic plates? Posted: 02 Oct 2020 05:34 PM PDT |
| For COVID, What is the range of times from "below the PCR LOD" to onset of fever? Posted: 02 Oct 2020 03:35 PM PDT President Trump is reported to have tested positive for COVID Thursday (presumably evening) but also had a fever Friday afternoon. He also has said he's tested at least daily. This seems like a very fast progression. My understanding is that PCR is sensitive enough to detect at viral loads well below what's necessary to trigger an immune response. So is 24 hours from negative result to fever within the confidence interval? I assume a negative test on Wednesday was a true negative, i.e. the viral load was below the limit of detection until Thursday. I also assume the President's COVID samples are fast tracked so the result is known around 8 hours after the swab. [link] [comments]  |
| Posted: 03 Oct 2020 04:20 AM PDT |
| Can an Alpha Process be replicated in a lab or a fusion reactor? Posted: 03 Oct 2020 12:23 AM PDT So, I've been playing around on Wikipedia, and I happen to come across a couple of article that talk about Alpha Processes, which to my understanding are various nucleosynthesis reactions in which certain elements are fused with Helium to produce other elements and energy in the form of photons. The one that caught my attention is what seems to be the most basic alpha process, in which a single Carbon-12 atom is fused with a Helium-4 atom to produce a single Oxygen-16 atom and 7.16 MeV of energy in the form of photons. Of course, Alpha Processes naturally occur within stars; but, what I'd like to know is if it's possible (at least in theory) to fuse Carbon-12 atoms with Helium-4 atoms either in a lab or at scale in a special sort of fusion reactor (to produce oxygen and clean energy). [link] [comments]  |
| How Long Does Sunscreen Protect You For? Posted: 01 Oct 2020 06:28 PM PDT Sunscreen bottles often say something like "reapply every two hours." Does that mean I have zero sun protection two hours after applying SPF 50 or does it mean the protection I have has dipped below the advertised amount of SPF 50? Does Sunscreen stop working flat out after two hours, or after two hours has my SPF 50 lowered itself to something like SPF 40? [link] [comments]  |
| Do species that live shorter life spans evolved faster? Posted: 01 Oct 2020 07:09 PM PDT I recently saw a video that talked about how ravens are much smart and more conscious than previously thought. It made me wonder if they can evolve faster than humans since they reproduce and die faster than we do. [link] [comments]  |
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