Abstract
Not many months ago, I gave my adult daughter a bicycle as a birthday present. After buying her a tire pump and a small tool kit, I wondered whether I should also buy her a helmet, the least expensive of which cost about $45. I complained about the price, but in the end I bought the helmet and gently but firmly exhorted my daughter to use it. She has since reported that she rarely, if ever, does.In this issue of the Journal, Thompson and his colleagues present solid evidence in their study of bicycle safety helmets to support . . .

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