Science Friday: Is football bad for your brain?

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Excerpt:

"The conversation about football and the future of the sport seems inextricably linked to concussions. Take former San Francisco 49ers linebacker Chris Borland’s decision to leave the National Football League after his rookie season, citing fear of brain damage from repetitive head trauma, for example, or the fact that 50 percent of Americans say they don’t want their sons to pick up the sport."