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Football is a killer game. But should it be killing our kids? One entrepreneur is trying to prevent that. According to a study by the American Academy of Pediatrics, 40% of all sports-related concussions happen to children, ages 8 to 13. That inspired health care entrepreneur Greg Merril to develop a football helmet sensor – a sensor that lets parents and coaches know when a child has had a potential concussion. Bob Smith interviews Brain Sentry inventor and founder Greg Merril .