> Well, our planet has magnetosphere and it also had life for a long time already.
But life needed water as a requirement to arrive, right? So are you saying that there was a little bit of water for life to get started, before that same life caused the oxygenation event to create more water over millions of years?
Well, yes -- some amount of water must have been in there from very beginning, plus what may have fallen in as icy bodies from outer space afterwards, this much is mentioned in the article itself. The question was not if there was water, but how much of it. Most of today's planetary body of water resides in deep depressions -- seas and oceans, which is very different to what must have been initially. Back then, the surface supposedly had very little relief, due to Earth's crust being much thinner at that time. That meant that, whatever water was there, it must have been shallow, spread to very large areas.¹ This condition was especially propitious for life, as it provided ample space for life to proliferate. The first organisms must have been at the bottom of this large, never drying shallow "ocean" or mesh of (at least often) connected seas. Deep enough to shield the emerging life from UV light, but shallow enough for light to reach the developing life, including the first unicellular algae. Even today, most of life lives on the shallow waters, where plants could find minerals and underwater sunlight, and thus the whole food chain above them could be sustained.
¹ Today's amount of water spread all over an Earth with no relief gives you a kilometers-depth ocean. Even with only some modest amount of relief (as it should have been at the beginning), if it didn't reached the water surface to produce shallow waters, then that's a non-starter for life. The life should have waited a lot of time for the Earth to cool down, for the crust get ticker and thus for a more prominent relief to appear in order for it to finally get any chance to emerge. Therefore, it was very important for life to encounter an environment with just modest amount of water.
> I know I’ll never be able to take martial arts; I have made peace with that
What do you mean? From the rest of your comment it seems you're saying this because you're fat? There are lots of fat fighters in professional MMA. So imagine if they had said that?
Once upon a time, I thought I could leverage my weight into attempting wrestling. My Doctor reiterated the same warning I’d gotten for karate, for boxing, for judo, for every martial art I’d ever wanted to try and take prior: one errant hit, and your damaged organ would need a transplant.
It’s just way too risky. That being said, I do think I’d like to find an instructor to help me focus on solo practice without having to go through the usual progression ladders/belts/rankings. For the meditation and body improvement, at the very least.
If you really want to, you can probably find a BJJ instructor to do privates and only 'flow' spar with them. When I spar with women for example, I match their strength and intensity. Depending on the organ/medical condition it may still not be worth it though. Good luck!
There is this old concept on facebook called "tagging faces". Someone who taken pictures of you has tagged it allready, mostly not just one person so fb probably has pretty good biometrics of your and my face. They scrape contact lists as well and other grey patterns to obtain your contact info. It is depressing how for each privacy activist there's dozens of useful idiots who will tag you and publish your phone number on fb in spite of you not wanting them to feed surveillance systems.
But life needed water as a requirement to arrive, right? So are you saying that there was a little bit of water for life to get started, before that same life caused the oxygenation event to create more water over millions of years?
Please explain, thank you.
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