Why did humans stand up?

Why did humans stand up? The finding, detailed in the July 17 issue of the journal for the Proceedings of the National Academy of Sciences, supports the idea that early humans became bipedal as a way to reduce energy costs associated with moving about.

The finding, detailed in the July 17 issue of the journal for the Proceedings of the National Academy of Sciences, supports the idea that early humans became bipedal as a way to reduce energy costs associated with moving about.