Nothing to do with cycling, but this article is interesting.
You Walk WrongThe rest of the article is here.
It took 4 million years of evolution to perfect the human foot. But we’re wrecking it with every step we take.
...In a 1997 study, researchers Steven Robbins and Edward Waked at McGill University in Montreal found that the more padding a running shoe has, the more force the runner hits the ground with: In effect, we instinctively plant our feet harder to cancel out the shock absorption of the padding. (The study found the same thing holds true when gymnasts land on soft mats—they actually land harder.) We do this, apparently, because we need to feel the ground in order to feel balanced. And barefoot, we can feel the ground—and we can naturally absorb the impact of each step with our bodies. “Whereas humans wearing shoes underestimate plantar loads,” the study concluded, “when barefoot they sense it precisely.”