We were in New York one summer, a long way from our home in Idaho, when it happened. Our little four-year-old daughter, Elliana, broke her arm on a trampoline. Doctors often say that trampolines are one of the most dangerous inventions ever made, at least for children. But in this case, she was only sitting on the edge of it eating ice cream when someone walked across it, and she fell off. We hoped it was only a sprain, but when we looked at it, we knew it was broken.