Steve James, director of ‘Hoop Dreams,’ on concussions and why NHL needs to end fighting now

"Head Games" is inspired by Christopher Nowinski's book of the same name. Nowinski is the former WWE wrestler turned concussion activist that has led the charge on chronic traumatic encephalopathy (CTE), a degenerative brain disease that has been found in athletes who suffered multiple concussions during their careers in contact sports.

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