Why does your hair seem so important? Turns out, it really, really did—at least to our ancestors. In a groundbreaking new study, scientists revealed that humanity’s trademark long, curly hair developed around two million years ago, right around the time early humans started walking upright in the scorching African sun.
It wasn’t just nature showing off—these curls changed evolution forever. We got a literal head start on evolution because they protected our ancestors’ developing brains from overheating. Tightly curled hair reduces heat absorption by half, and our hair grows continuously for up to seven years, thanks to our genetics. Humanity didn’t just conquer the planet with brains—we did it with good hair.
