Head injuries "are super dangerous" according to my 4-year-old who insisted on wearing his bike helmet as he flew down the cement speed slides and shot up a rope web like a spider during a recent trip to the park. While fellow parents credited my husband and I with the ingenious idea, we laughed because it was a concept that hadn't occurred to us. We have our kids strap on their helmets when they ride their like bikes, scooters, or skateboards, but that's about it. In the weeks since my lil guy gave me the tip, I've noticed other children wearing helmets while climbing trees and ice skating. Do you take the precaution for other activities?