The New York Times looks at the pitching motion - why we have it and other animals don't.
The ideas that human throwing ability is unique and that it was important in human evolution and related to hunting are as old as Darwin. And pitching coaches and experts in sports medicine have long analyzed the details of the throwing motion, which is used in a number of sports. What is new in Dr. Roach’s study, say anatomists, is the idea of the shoulder’s functioning like a slingshot, and tying the specific anatomical changes to the fossil record.
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