I believe the prevailing hypothesis is that there was a tiny mutation in a human brain ~50,000 years ago that causes spoken language to be possible, but there a

I believe the prevailing hypothesis is that there was a tiny mutation in a human brain ~50,000 years ago that causes spoken language to be possible, but there are other ideas. It's a fascinating area of research: http://en.wikipedia.org/wiki/Behavioral_modernity http://en.wikipedia.org/wiki/Behavioral_modernity