ScienceDaily -- Computer simulations provide new mathematical support for the "grandmother hypothesis" -- a famous theory that humans evolved longer adult lifespans than apes because grandmothers helped feed their grandchildren.
MORE: http://www.sciencedaily.com/releases/2012/10/121023204142.htm
See also...
Fuller Picture of Human Expansion from Africa
http://www.sciencedaily.com/releases/2012/10/121022145445.htm
