- AskScience AMA Series: I'm Jon Schwantes from Pacific Northwest National Laboratory, and my team is working to uncover the origin of uranium "Heisenberg" cubes that resulted from Nazi Germany's failed nuclear program. Ask me anything!
- If light is just a radio wave with a different frequency then can visible light be created using an antenna ?
- Why do magnets demagnetize at high temps?
- Do electromagnetic waves decay?
- How does different masks compare(cloth, normal medical masks, N95 etc) in terms of stopping Covid?
- How did we create the smallpox vaccine without even discovering antibodies yet?
- have there been cases of people getting vitaminosis of fat-soluble vitamins from rapid fat loss?
- What other "long overdue" disasters are there?
- What kind of protection do memory T cell stored in bone marrow provide, compared to neutralizing/sterilizing immunity?
- How powerful a telescope would you need to be able to see something like the lunar rovers or old landing sites on the moon?
- How well do amputated limbs 'work' after they've been reattached?
- Gastroenterologists, does eating large quantities of capsaicin have a significant impact on the gut microbiome? If so, how? What about if you were to eat a small quantity of capsaicin rich food like a Carolina reaper?
- Covid19 vs Sars1 why the difference in mutation rates?
- Why do we have a 15min wait after the COVID vaccine and not others?
- Why didn't the Y-chromosomal Adam and Mitochondrial Eve spawn around the same time?
- What decides the initial shape of the shape-memory alloys?
- Why after osseointegration skin does not "stick" to an implant?
| Posted: 02 Sep 2021 04:00 AM PDT Hi Reddit, this is Jon Schwantes from PNNL. My team and I are working to uncover one of history's great mysteries. During WWII, the United States and Nazi Germany were competing to develop nuclear technology. The Allies thwarted Germany's program and confiscated 2 inch-by-2 inch uranium cubes that were at the center of this research. Where these cubes went after being smuggled out of Germany is the subject of much debate. Our research aims to resolve this question by using nuclear forensic techniques on samples that have been provided to us by other researchers, as well as on a uranium cube of unknown origin that has been located at our lab in Washington for years. I'll be on at 10:30am Pacific (1:30 PM ET, 17:30 UT) to answer your questions! Read more here:
Username: /u/PNNL [link] [comments]  |
| Posted: 01 Sep 2021 09:13 AM PDT |
| Why do magnets demagnetize at high temps? Posted: 02 Sep 2021 01:13 AM PDT |
| Do electromagnetic waves decay? Posted: 02 Sep 2021 06:26 AM PDT A friend sent me this cool video recently. It shows how a parabolic dish can turn a wave originating at its focus into a highly directional pulse. The pulse appears to remain self-contained without spreading out as it travels. This made me wonder. How far will this directional wave travel in a complete vacuum? To me, it seems that such a transmitter -even with perfect geometry and reflection- would not have an unlimited range. But most EM waves 'decay' due to the inverse-square law, where their amplitude is attenuated as the wave spreads outwards in all directions. That is clearly not happening here, so what factors would limit the range of this transmitter? If I had to guess, I would say that the electrical permittivity and the magnetic permeability of empty space would be the factors that limit how far a wave (that is ignoring the inverse-square law) could propogate. But I'm not %100 sure. What do you guys think? [link] [comments]  |
| How does different masks compare(cloth, normal medical masks, N95 etc) in terms of stopping Covid? Posted: 02 Sep 2021 02:03 AM PDT |
| How did we create the smallpox vaccine without even discovering antibodies yet? Posted: 01 Sep 2021 02:39 PM PDT The smallpox vaccine was first created in 1796 yet the discovery of antibodies was in 1890. How did this happen? [link] [comments]  |
| have there been cases of people getting vitaminosis of fat-soluble vitamins from rapid fat loss? Posted: 01 Sep 2021 06:33 AM PDT Fat-soluble vitamins such as retinol are stored in the body's fat tissue. During weight loss, if done right, one should expect to see body fat reduce; does this release all the fat-soluble vitamins stored in there? Has this ever caused vitaminosis because it was done too rapidly? [link] [comments]  |
| What other "long overdue" disasters are there? Posted: 01 Sep 2021 07:42 AM PDT So we finally got the global pandemic. Are there other calamities that scientists have been saying are long overdue, like the Big One in California? Where do we stand on these catastrophes-in-waiting? [link] [comments]  |
| Posted: 01 Sep 2021 11:59 AM PDT There's lots of discussion around the vaccines providing the best source of sterilizing immunity, but what protection could be provided from these memory T cells from natural infection and the following convalescent immunity? And do vaccines also provide this same type of immunity, or only sterilizing immunity? [link] [comments]  |
| Posted: 01 Sep 2021 08:53 AM PDT Would we be able to see anything at all or would the atmosphere be a problem? Thank you! [link] [comments]  |
| How well do amputated limbs 'work' after they've been reattached? Posted: 01 Sep 2021 09:09 AM PDT Say someone had a hand sliced off, and all of the circumstances were ideal for them to get it put back on (say the accident happened in the middle of a well funded hospital with experienced surgeons on staff). If this hand gets attached, will the person be able to have the same kind of dexterity in their hand/fingers as they did before the accident? [link] [comments]  |
| Posted: 31 Aug 2021 11:57 PM PDT |
| Covid19 vs Sars1 why the difference in mutation rates? Posted: 01 Sep 2021 04:25 PM PDT Why does the covid virus mutate so fast and successfully when compared with other viruses like Sars and Mers? [link] [comments]  |
| Why do we have a 15min wait after the COVID vaccine and not others? Posted: 02 Sep 2021 12:10 AM PDT Has this anything to do with being studied/in trials, as such, still? [link] [comments]  |
| Why didn't the Y-chromosomal Adam and Mitochondrial Eve spawn around the same time? Posted: 01 Sep 2021 01:37 AM PDT I have to admit that I have a religious bias when asking these questions, so I'd love for you to untangle that if needed. But my question is that, why didn't the Y-chromosomal Adam and Mitochondrial Eve spawn around the same time? Like wouldn't the mother (Eve) and father's (Adam) genetics carry to all humans if all humans hail from the same ancestors? So would they be alive at the same time (when the ancestors were alive)? To bring the religious side to it: Assuming that Adam or Eve was the Y-chromosomal Adam or Mitochondrial Eve, when Adam and Eve had children, and their children bred with other humans, human like species and etc, and all humans hail from Adam and Eve. Would this case would this be the Y-chromosomal Adam or Mitochondrial Eve? In my mind it would seem to be both, but I have a limited understanding of genetics to know if this is true or not. I watched this video talking about it a bit, but only mentions Mitochondrial Eve, but not Y-chromosomal Adam, is there any reason why that is? Is the former more important than the later? [link] [comments]  |
| What decides the initial shape of the shape-memory alloys? Posted: 01 Sep 2021 06:49 AM PDT I saw a video(link above) on how nitinol works, and the video creator explained the shape-memory ability of the nitinol alloy. He had a spring made of nitinol and then he deformed that spring using power, after that he showed how by using water, heat, or electricity we easily get that spring back to its initial shape. My question is that what or which process/component decides what that initial shape is going to be that we will get when we apply heat, water, or electricity to a shape-memory alloy like nitinol? [link] [comments]  |
| Why after osseointegration skin does not "stick" to an implant? Posted: 01 Sep 2021 06:27 AM PDT What are the problems that prevent making osseointegration compatible with the skin and making it "stick" to implant's external part, like skin "sticks" to nails, preventing pathogens from getting to nail base (unless skin gets damaged)? [link] [comments]  |
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