It's become more common in recent years to see NFL players wearing Guardian Caps on the field. Here's how they work.

Football players (and anyone else who takes hard hits) may want to breathe a sigh of relief. Engineers at CU Boulder and Sandia National Laboratories have been hard at work researching and developing ...

Pittsburgh Steelers linebacker James Harrison is perhaps better known for the physical harm he inflicts on others, but his hard-hitting ways have exacted a toll on his own well-being, too. Estimating ...