Kickoffs - Ball teed at the 35. Touch-backs (at least for kickoffs) are spotted at the 25. They are trying to cut down on kickoff return related injuries where their stats indicate a high percentage of concussions come from. Makes for some possible interesting new strategies for special teams coaches. Helmets - If a player's helmet comes off during a play and it isn't deemed to have been ripped off by an opponent, that player must sit out the next play. I think we've all noticed the frequency of this happening in recent years. I thought it was partially due to big hair but it seems guys aren't snapping chin straps or playing with them loosely adjusted.