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10 Steps in the High-Tech Evolution of Pro Football Helmets

popularmechanics.com — With tackles regularly drilling NFL players at more than 150 g's, their heads need the best protection possible. In this exclusive kickoff weekend excerpt from the new PM book How a Curveball Curves: The Incredible Science of Sports, track the history of brain safety on the gridiron, from "head harnesses" to face masks.

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