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NFL's all-time toughest players

Given that he lost his fingertip on Sunday, there's no doubting the toughness of Arizona Cardinals safety Rashad Johnson. But he is not alone. The annals of pro football are filled with tales of toughness and determination and those stories have become the stuff of legends. Neil Reynolds, author of "The Pain Gang: Pro Football's Fifty Toughest Players", tells the stories of men who truly can claim to be among the toughest players in NFL history.