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It took a few million years for human ancestors to evolve into the walking, talking, texting and blogging creatures we've become. Along the way, the human body and brain have changed a lot. And we couldn't have done it without our feet.
Our ape-like ancestors had a foot built for grasping branches and climbing trees. But our foot is stiff, taut and springy, built for walking and running.
Brian Richmond, an anthropologist, runner and kids soccer coach, is trying to find out how our unique appendage evolved.
"So here I've just pulled the skin back, and here you can see one of those characteristics that's really uniquely human, and that is the long tendon that runs from the heel, underneath the skin, forward, all the way to the base of the toes." It's called the plantar aponeurosis. It's a flat, broad tendon, whitish and taut. Along with spring ligaments, it gives the foot its arch and its stiffness.