(Bloomberg Business) — When the Steelers and Patriots clash on Thursday night in football's season opener, you'll see 250-pound men slam into each other, head to head, at high speed.

And get concussions?

There's no easy way to tell. That goes for young athletes, too, whose developing brains are particularly vulnerable to damage if they keep playing after getting a concussion. Sports-related brain trauma sends a quarter-million American kids to the emergency room annually, but symptoms may unfold over hours, days, or even weeks.

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