"Daniel Lieberman is interested in what makes the human body look the way it does. His passion is running. There are features over our whole body which help us to run well. One is the toes. Short toes help running. Tendons in the leg act as springs. These evolved around 2 million year ago. The bum tenses with every stride, preventing the trunk from pitching forward. There are features in the spine, neck and head. These all make us good long-distance runners but have no use in walking. Daniel Lieberman suggests we were good hunters on the savannas of Africa."
See the transcript, in fact listen to the audio, of the ABC Science Show's "Humans - built for long-distance running?", at http://www.abc.net.au/rn/scienceshow/stories/2008/2198911.htm
Thanks to Peter Hogan for the link.
Cool morning hot lap of the Bay
3 hours ago