Va. Tech puts sensors in football helmets

The ball is snapped and Virginia Tech's junior varsity football team slams into Hargrave Military Academy's offensive line in a crunch of plastic helmets and face masks that sounds like a 10-car pileup.

Somewhere in the mix, a Hokies defensive lineman gets cracked on the head at 80 times the force of gravity--about as hard as head butting a brick wall. It's one

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