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straight thin hair, like the blue eyes and huge forward facing forehead and perfect teeth, are all evolutionary regressions on functions that demonstrate genetic value like a man can by 'wasting money'.
I'm so valuable, that the nappy all-black pencil-thick hair, which used to be absolutely MVP for winning fights at the equator in Africa, is dispensed with.
Same with the blue eyes, the creaturas we evolved from had all-black eyes, and later black surrounded by whites in eyes. Only Pharohs and high ruling classes with access to 1 in a million babyfactory could say: "Want the 1 in a million Blue Eyes" which is correlated with value on other genetic fronts.
Same with the wideness in the forward facing middle teeth and caynines, the ruling class saw teeth and eyes as the clear window into their empires and so naturally forming perfect teeth was associated with what the ancients (7 thousand years before the agricultural revolution), demanded.
You're a genetic algorithm son of man, and your DNA stacks probabilities according to the calculus 9 of multiple multi-dimensional surfaces. And can unroll this to cpu compute as molecules playing musical chairs of juggling chainsaw blades at the molecular level, and then reroll it back into pointers in which direction everyone should go to maximize outcomes for all.