Are you a milk mutant? 

Watch the full lecture here: www.gresham.ac...
The species we recognise as our own - anatomically modern humans - has existed for only 300,000 years, a blink of an eye in evolutionary terms. And yet during that time our species has been shaped by strong evolutionary forces, often unwittingly as an indirect result of human activities.
An excerpt taken from a lecture by Professor Robin May called 'A 300,000-Year History of Human Evolution'