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There are limits to how many times a baseball player can pitch before damaging his shoulder, but there are no limits to how many times an athlete can get hit in the head without permanent damage.
Until contact sports are safer, Chris Nowinski would hold off as long as possible before letting his future children play games where repetitive brain trauma is commonplace.
Christopher Nowinski explains that big concussions in sports are finally being appropriately diagnosed, but 80-95% of the "littler" ones are still going undiagnosed.
An athlete should never be returned to play after a concussion until all symptoms have been resolved and he or she has been cleared by a licensed provider.
Taking the head out of football — and ice hockey and other contact sports — is easier said than done, but some rule changes would certainly decrease the number of sports-related brain injuries.