Human evolution is usually described as a sequence of momentous changes or developments to our species. You’ve got the move from knuckle walking and tree dwelling to perpetual bipedalism that occurred a few million years back as perhaps the biggest step toward homo sapiens and away from the lower primates. There’s the big brain, too, as well as the tool making. Language acquisition, art, spirituality, and, yes, agriculture are other major milestones in our journey. These developments punctuated and defined our evolution, and they’ve come to define what it means to be human. What other animals walk upright all day long, manipulate and craft complex machinery, employ an over ten thousand-word verbal vocabulary, and shape the natural world around them?
Well, it’s probably time to augment our evolutionary CVs with yet another bullet point: the development of our unique shoulder joints.

As a recent NPR story highlighted, the human shoulder joint took […]

Original post by Mark Sisson

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