I know a cyclist who a) insisted on wearing no helmet "because it doesn't look cool," b) crashed on an abandoned dirt mountain road in China, c) admitted to having a concussion and black out for at least a few minutes (but doesn't know for how long). d) He returned to the U.S. stating "maybe I should wear a helmet more often when cycling." Then, e) in the very same breath, insisted, on a 20 mile bike ride on country roads, NOT to wear a helmet. And this person relies on his brain for his profession.