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Title: Why do humans walk on two legs? To save energy Post by: Shrey on July 23, 2007, 08:43:36 PM Why do humans walk on two legs? To save energy
Chimps on treadmills may help explain why human ancestors evolved into bipeds 10 million years ago.Images: Humans vs. chimps at the gym http://news.com.com/2100-11395_3-6198273.html?part=rss&tag=2547-1_3-0-20&subj=news |