"Learning from Experience, Not"

Fine little story illustrating the author's point:

A high-school friend had a father who worked in a factory.  He had a story . . . it seems there was this guy who got his left arm caught in one of the machines and horribly mangled.  He was out for months, and when he came back, the other workers crowded around him, asking “How did it happen?”

“Like this,” he said, demonstrating with the other arm.