While many animals walk on the balls of their feet, humans use a heel-first stride. Researchers suggest that this gives humans the advantage of longer 'virtual limbs.'
New research conducted by scientists at the University of York reveals for the first time that Europe's earliest humans did not use fire for cooking, but had a balanced diet of meat and plants -- all eaten raw.
He stood a majestic 5-foot-5, weighed around 100 pounds and maybe had a harem. That's what scientists figure from the footprints he left behind some 3.7 million year ago.