American
football can cause damage to the head. Retired players have been
tested and most of them had some brain tumor. This is because of the
hits they receive in the head while they are playing. Players give
other players lots of kicks and they fall down with their head. If
they don't wear helmets, they could have serious injuries on their
brains.
From Sciencedaily.
Written by Rubén Ferreira and Sebastián Noreña
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