A national rise in public bike sharing programs could mean less air pollution and more exercise, an environmental and health win-win for people in the cities that host them, but according to researchers at Beth Israel Deaconess Medical Center, more than 80 percent of bike share riders are putting themselves at significant health risk by not wearing helmets. "Head injury accounts for about a third of all bicycle injuries and about three-quarters of bicycle related deaths, so these are some pretty shocking numbers," says lead author and emergency medicine physician Christopher Fischer, MD...
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