rachelle oldmixon specialises in behaviours. i'm phil torres, i study insects in peru. that's our team. let's do some science. ♪ music ] >> hi, guy, welcome back to "techknow." i'm phil torres, with rochelle, kyle and lindsay. kyle, the nfl paid over three-quarters of a million to settle a lawsuit. what was it about. >> there's a focus on the concussion problem. the nfl has thousands of place, and millions of players in youth and challenge football. i went to virginia tech to look at technology to test helmets and track hits on college and youth players. let's take a look. . >>> homecoming in the heartland. this is cornhusker county. nebraska university, the epicentre of college football. >> first big win. >> along with the tradition of football - come the hits. cheer cheer >> big hits like this one in front of our cameras. no one knows how hard the hits can be better than blake lawrence. former lion backer for nebraska korn huhs kerrs. >> if -- korn huhs kerrs. if you had to bang your head into somebody and that was your job, that's your best weapon. if they said, "go