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The recurrence of Sidney Crosby’s head injury problems just three weeks into his comeback after 10 months out of ice hockey has raised questions about the dangers of professional sport, with fears that the career of the Pittsburgh Penguins captain could be badly affected.

Former professional wrestler Chris Nowinski's career was ended by concussion.

After leaving the ring, Nowinski founded an institute promoting research into head injuries in sport.

Speaking to Al Jazeera's Rahul Patak, he says there has to be a larger push for education about the issue.

Source: Al Jazeera