Shiver-inducing science not for the faint of heart. No one studies fear quite like Margee Kerr. A sociologist who moonlights at one of America's scariest and most popular haunted houses, she has seen grown men laugh, cry, and push their loved ones aside as they run away in terror. And she's kept careful notes on what triggers these responses and why. Fear is a universal human experience, but do we really understand it? If we're...