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To What Extent are Humans Optimized?

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TierZoo is an entertaining youtube channel that pretends animals are like classes in a video game and rates their stats. He thinks pretty highly of humans. I recommend his videos in general.

https://youtube.com/watch?v=ImYu9dJM4kQ

https://youtube.com/watch?v=BJzJtm7OfdQ

I think humans, outside of the more recent brain areas that have had relatively little time to evolve, are generally pretty optimized. Not perfectly, but our(and every animal's) biology is really quite impressive. Just look at how few improvements you can make to humans by adding prosthetics. Glasses can improve our vision, but other than that, even if you're a billionaire, you aren't really able to improve upon the human body beyond what biology already gives you.

The knees and lower spine of humans are famously frail for the load they have to support -- a consequence of remolding our body for erect bipedalism in a relatively short time.