Why did our ancestors start walking upright? Ancient terrain may hold clue.
26/05/2013 21:13
A study suggests that rocky landscapes in East and South Africa could have pushed our apelike ancestors toward bipedalism. Being four-legged has its perks. As a quadruped, your center of gravity is lower, there's less wind resistance when you're running, and, best of all, you can use your hind foot to scratch your ear. [Read more] ...