Two helmet-related TV stories.
1. On NBC Night News they had a story about an 82 year old woman who rode her bike a lot. No helmet. I'm guessing that at 82, it wouldn't take much of a knock on the head to kill you.
2. I saw a video about a guy who "can teach anyone to ride a bike in five minutes." Shows video of an adult on a bike for the very first time. No helmet.