Winter X Games daredevil Caleb Moore died while attempting to execute a flying backflip aboard a snowmobile. Experts believe the continued pursuit of dangerous feats is inevitable along with an escalation in their degree of difficulty. Risk-taking is an essential quality of our species, explained Frank Farley, a psychologist at Temple. "I define risk-taking as engaging in something with an uncertain outcome. We're always pushing to areas of uncertainty, where we can't control the variables," he said.