High-tech helmets reveal new information about the impact of hard hits to the head

In a game that spawned the term "slobber knocker," is there a limit to the amount of impact a football player's head can handle before the player suffers a concussion?

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<p><a href="http://www.physorg.com/news116230688.html">High-tech helmets reveal new information about the impact of hard hits to the head</a></p> <p>In a game that spawned the term "slobber knocker," is there a limit to the amount of impact a football player's head can handle before the player suffers a concussion?</p>