>>72394417Eyebrows from pre-modern humans were very robust because they 100% only were to avoid sweat in the eyes as you mentioned
The more social we got, the more our eyebrows got "optimized" so they also work to display emotion at the expense of not being so effective as before for sweat. You can still see the good old big eyebrows in people everywhere, maybe not as much but still.
Also, humans are the only species that domesticates, so we also have self-domesticated ourselves, cue we getting exponentially smarter over a fairly short amount of time and everyone else just, stopped trying to go smart.
