Is Our Lack of Stillness Hardwired?

CNN.com's John Sutter talks about his fascination with the human inability to be still. He says that even 500 years ago, we had trouble just sort of sitting in being. We tend to think of ourselves as top of the food chain, you know, the predators,. But when you look at our lutionary history, in our ancestral environment, we were often prey and skittish.