More than a decade ago, the sports equipment manufacturer Riddell was developing a highly anticipated new football helmet designed to reduce players' risk of concussions. The helmet was ambitiously called the Revolution. It would become the most widely used helmet in the NFL and earn millions in sales to players in college, high school and youth leagues.
But back in 2000 the company received a warning: A biomechanics firm hired first by the NFL and later by Riddell to test helmets ...
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