I read a great book recently about youth sports, and the author pointed out that the most common youth injuries nowadays are overuse injuries, since so many kids specialize in one sport and one position and play their sport twelve months a year and all that sort of thing. In the 70s, I don’t think there was a day of elementary school when there wasn’t some kid in class with a cast. Every Monday, there would be a story about how somebody broke his arm over the weekend. I didn’t break a bone until the summer after 10th grade, and I felt left out. But now you almost never see young kids with broken bones.