Your Brain On Football

Kruse: Berkeley Prep's Robert Klein, fast, tough and committed, took the handoff and raced toward the end zone. Crack! He spun off the first tackle and darted to the left and accelerated over the goal line. Crack!

Touchdown.

Klein's father, who played football in high school and college and is now a cardiologist, stood with a video camera on the top row of the bleachers.

Under those bleachers, in the athletic trainer's room, a computer recorded the same play in a totally different way. On the screen were statistics and color-coded lines on a graph tracking information received in real time from six sensors embedded in the padding of Klein's helmet.