Does global contraction play any role in modern geology? |
- Does global contraction play any role in modern geology?
- Teplizumab is an antibody that targets the CD3 receptor on T-cells to prevent the T-cells from attacking the Insulin-producing Beta cells in the pancreas. How is the teplizumab able to specifically inhibit only the T-cells targeting the B-cells without compromising the immune system?
- Why do volcanic hotspots create a chain of volcanoes instead of a continuous ridge?
- How do infectious microbes stay endemic in human (and other animal) populations through long periods of time?
- How do neurosurgeons open a skull without damaging the brain?
- Do climate models consider positive feedback loops ?
| Does global contraction play any role in modern geology? Posted: 30 Oct 2020 09:46 PM PDT From what I understand global contraction, or the slow shrinking and deformation of the Earth's crust, was one of the dominant ideas in geology prior to the development of plate tectonics. I know it has been ruled out in favor of plate tectonics, but I recently read that it does seem to have played a role in shaping features on other bodies in the solar system like Mercury and the moon. I'm curious if global contraction is still thought in modern geology to have had any kind of effect on Earth's crust in the present or past? [link] [comments]  |
| Posted: 30 Oct 2020 08:06 AM PDT |
| Why do volcanic hotspots create a chain of volcanoes instead of a continuous ridge? Posted: 31 Oct 2020 02:41 AM PDT Why do volcanic hotspots create a chain of volcanoes like for example the hawaiian island chain instead of creating a single continuous ridge? [link] [comments]  |
| Posted: 30 Oct 2020 08:11 AM PDT Like many others this year, I have become much more interested in infectious diseases than I have been before. Hopefully I've learned some things and steered clear of misunderstandings. One thing that confuses is the problem posed in the title. Some people have suggested that there is a strong possibility that Sars-Cov-2 ends up being endemic in human populations, much like chicken pox, cold and flu viruses currently are. This would mean that it would carry on circulating in populations permanently. My question is how is it possible for a virus to keep circulating indefinitely when, at some point, the reproduction number (R number) will necessarily be less than one and the number of new infections starts to decrease. When the number is above one, the number increases exponentially. But because limitless increase is not possible (due to a limited number of people), at some point the number of new infections will start decreasing and, thus eventually, become zero, at which point the virus will stop circulating. I can see how cold viruses can continue circulating: immunity to them is temporary, and so with enough time passing, a previously infected segment of the population becomes susceptible to the virus again and thus the R number can go above 1 again. I cannot see so well how chicken pox remains endemic. After contracting it, people become immune for life. Evidently the population get replenished with susceptible people through new births, but I'm still confused about why the virus doesn't die out between bouts of epidemics. The virus is famously very contagious, so shouldn't it essentially run through every susceptible person in the population and then just run out of steam? I hope my question makes sense. Please do let me know if I have misunderstood anything. [link] [comments]  |
| How do neurosurgeons open a skull without damaging the brain? Posted: 30 Oct 2020 10:42 AM PDT With different parts of the skull having different thicknesses, differences in thickness between age and gender, and given how delicate the brain and the meninges are, how does a surgeon not accidentally cut right into the brain when removing a section of skull for surgery? [link] [comments]  |
| Do climate models consider positive feedback loops ? Posted: 30 Oct 2020 04:00 PM PDT Atmospheric Physicists/Scientists, do the climate models forecasting the warming of the planet take into account any positive feedback loops? We experienced some nasty wildfires this year, record temperatures, and record number of hurricanes due to warming temperatures. All this leads to even more carbon into the atmosphere, thus warming the planet even more, and the cycle continues. Have the models considered this? [link] [comments]  |
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