SuperFreakonomics: questioning football helmets

The World
This year's football season ? full of exciting games and undefeated teams ... is also unfolding amidst concerns over head injuries to players. But what would happen if the helmets meant to protect players' heads were removed from the game? "SuperFreakonomics" co-author Stephen Dubner reports on the surprising outcomes, with safeguards and incentives included, of course.
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