You might think all the facial hair you're seeing on the street is a way of attracting a mate. It might not be so simple. What is the point of a beard, evolutionarily speaking? Children, women, and a whole bunch of men manage just fine without one.
But take a walk down some streets these days and you'll be confronted with all sizes and shapes of groomed (and less groomed) facial hair - from designer stubble to waxed moustaches and hipster beards. New research shows that beards probably evolved at least partly to help men boost their standing among other men.