i saw a discovery channel show on it...here is a short vid
"In the last 10 Million years our species has survived about 30 of these" ??
He may be a good physicist, but he is a shit 'Anthropologist', which is the study of human beings, everywhere & throughout time. Modern human beings are defined as members of the species 'Homo-sapiens', which arose (according to current understanding) in Africa at roughly 200,000-BP (Before Present).
So, aahhhhhh - YEAH !!
You also used the dreaded words 'History Chanel' - please don't say 'National geographic'