We humans seem to have an on-again, off-again relationship with facial hair.
Prehistoric cave drawings reveal the myriad tools our ancient ancestors used to shave: shark’s teeth, sharpened flints and even clam shells. Nowadays, beards are back in style and people are taking a razor to their brows, instead.
But is there a reason we evolved to have these hairy baubles in the first place? And, if so, what evolutionary advantage might we be throwing away for the sake of staying on trend?
Turns out, researchers have a lot to say on the matter. Get their answers to why we have eyebrows, what eyelashes are for and why we grow beards.