I'm guessing this has occurred to most people at some point or another, although maybe it hasn't given my very tenuous and inaccurate grasp of what an ordinary human mind is like.
Doesn't it seem like evolution is ridiculously precise? Like, ridiculously? I've been wondering for a while about what the evolutionary purpose of human hair was, especially given how it's so localized to the head and the crotch. The crotch makes a lot of sense for logistical reasons we won't get into here, but the head is just confusing. But then I realized this morning that it was there for a practical purpose- protecting the head from sunburn. The reason for the color of hair is melanin, which is the pigment in the skin that protects from sunburn. That's a beneficial trait for evolution to give us, yes?
But the corollary of that would be that an entire segment of the human population would have to have been wiped out because they weren't well adapted to something that would kill a bald person. I can't think of anything that would only kill bald people except for a serial killer who only killed bald people.
This leads me to speculate that there was an evil, bald child-abusing caveman in the Great Rift Valley, and that two things happened as a consequence. First, his own child was turned sociopathic by a traumatic upbringing and went on to kill all the prematurely bald people before they reproduced. Next, his other victims forced early cavemen to select for genes that made us associate baldness with creepy child molesters and cartoonish supervillains.
Also, I just realized that having hair on our head protects us from UV rays which give us skin cancer, which is probably a much better explanation than the one I just suggested. But I don't think we should rule out my hypothesis just yet.
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9 years ago