Indeed.
On another subject: I'm reading Brian Fagan's book Floods, Famines and Emperors, he says that the world's human population in 13,000BC was 8.5 million. (I know you like population numbers)
Thanks for that number! Well-considered numbers that far back are hard to come by. Does he give his source or any supporting rationale for it?
How did he come up with that number? The number seems to small to sustain genetic viablity, when you look at the area we are talking about.