Question: Why can some men grow sideburns whilst other's cannot?

Helen O'Connor answered on 23 Jun 2011:

This is down to genetics. Some men have a better, thicker and more even beard than others. And other men grow a beard but it’s more patchy in places. I guess these days we don’t need beards or sideburns to keep us warm, so not having sideburns won’t affect the survival of the species!