On Our Own Two Feet

There are many differences between our skull and a chimpanzees skull. Like for instance, a human brain case is much, much larger than the chimpanzees brain case. Some people think we evolved from chimpanzees. But we did NOT evolve from chimpanzees. We share a common ancestor that lived about 6,000,000 years ago. Walking on two feet is very old, it came long before we modern humans evolved our big brains. It is at least 3,000,000 years old. But there is also evidence that walking on two feet might be even older! A. Aferensis lived 3,000,000 years ago. Their skull, looks a lot more chimp like than human like. A. Aferensis walked on two feet. Although, chimpanzees walk on all fours, their spines angle up slightly, but are nowhere near straight up and down. Creatures with brains not much bigger than chimpanzees had been walking on two feet for millions of years before human sized brains evolved. But for early humans, when they started walking on two feet, they where taller, and they could see more up ahead of them. But that was bad too, because then other animals can see them too. So in that way it is bad. But there is a good side to it. Like that, we have two free hands for making stone tools, fire, and mostly child care! 

Whitt, Stephen. "On Our Own Two Feet." Odyssey Oct. 2009: 26-28. Print.