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Researchers have developed technology that could detect and measure the impact of blows to the head in real time during a game, but the NFL has yet to use it.

Former Chicago Bears QB Jim McMahon says repeated blows to his head during his playing days is taking a toll on him today, which is why he is among the hundreds of former players suing the NFL.

Emery Moorehead, Mike Ditka and Chris Nowinski discuss the death of Dave Duerson and the connection between head trauma and depression

Tom Rinaldi examines the tragic story of Owen Thomas and the evolving mystery of head trauma in football.