Jeffrey L. Tedder

What you need to know about knees

What you need to know about knees
What you need to know about knees

According to Craig Stanford, Californian anthropologist, "Of more than 250 species of primates, only one goes around on two legs," and that’s us, humans.

It allows us to stand on our own two feet

According to Craig Stanford, Californian anthropologist, "Of more than 250 species of primates, only one goes around on two legs," and that’s us, humans.

We can walk on two legs so easily because our knees can fully extend and 'lock'. Chimps cannot do this on two legs, so when they try to walk upright they have to use a huge amount of muscle power to support their body weight and end up rocking back and forth in the process, before resorting to four legs again.

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