LiveScience.com - After two tremendous growth spurts - one in size, followed by an
even more important one in cognitive ability - the human brain is now a
lot like a teenage boy.
LiveScience.com - Like humans, some lizards are always on the go, grabbing food en route, while others wait like couch potatoes expecting pizza delivery.
LiveScience.com - There have been many suggestions for how and why our hominid ancestors got
out of the trees and started walking. The latest: a prehistoric shuffle
driven by an empty belly.