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If I knew I was going to have a wreck and hit my head, I would want to have a block of Styrofoam strapped on. It's just that the same logic argues for kneepads, eye protection, a bullet-proof vest and carrying a lightning rod. I believe that helmets reduce risk of injury in some crashes. They do a good job protecting against less serious scalp injuries, help protect against direct-impact brain injury, though apparently are not so helpful with brain injury caused by rapid twisting of the head during impact. The problem with interviewing neurosurgeons is that you don't hear about the people who didn't make it to the hospital.