After a season which already has seen dozens suffer concussions, officials at the National Football League are now threatening heavy fines and suspensions for players who continue to deliver so-called \"dirty,\" helmet to helmet hits that can cause brain 

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Sports Illustrated: <a href="http://sportsillustrated.cnn.com/vault/article/magazine/MAG1176374/4/index.htm">The hits that are changing football
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This hit left the Cincinnati Bengals' Jordan Shipley (center) with a concussion, and the Cleveland Browns' T.J. Ward (right) with a fine.  (AP)

This hit left the Cincinnati Bengals&#039; Jordan Shipley (center) with a concussion, and the Cleveland Browns&#039; T.J. Ward (right) with a fine.  (AP)