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Posted by11 hours ago
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So, I know it didn't disappear per say, it likely in some aquifer.. but..

I would assume:

  1. since we know water was formed by stars and came to earth through meteors or dust, I would assume the distribution of water across planets is roughly proportional to the planet's size. Since mars is smaller than earth, I would assume it would have less than earth, but in portion all the same.

  2. water doesn't leave a planet. So it's not like it evaporates into space 🤪

  3. and I guess I assume that Mars and earth formed at roughly the same time. I guess I would assume that Mars and earth have similar starting chemical compositions. Similar rock to some degree? Right?

So how is it the water disappears from the surface of one planet and not the other? Is it really all about the proximity to the sun and the size of the planet?

What do I have wrong here?

Edit: second kind of question. My mental model (that is probably wrong) basically assumes venus should have captured about the same amount of H2O as earth being similar sizes. Could we assume the water is all there but has been obsorbed into Venus's crazy atmosphere. Like besides being full of whatever it's also humid? Or steam due to the temp?

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Posted by
Microbial Ecology
6 hours ago
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It seems to me like a lot of bad stuff happens because people who are supposed to be in positions of authority (e.g. police) end up acting cowardly.

My gut feeling is that this behavior is a predictable personality trait and therefore able to be tested for, to weed out cowards from jobs that require extreme bravery. But my gut has been wrong many times!

Thanks!

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784
Posted by1 day ago

Why do our bones stop growing, do we run out of chondrocytes?

I would assume we run out of chondrocytes the older we get and that would be the reason bone growth slows down significantly until the growth plate closes. Or is it that a signal tells our body to stop proliferating bone cells.

Another question would then be why can’t we inject out bones with more chondrocytes if that's the issue?

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Posted by1 day ago
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Posted by2 days ago
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0
Posted by3 hours ago

At some point it seemed like there was a new variant every 2 months or so. What happened that it suddenly stopped?

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