Even though the modern world isn’t any more dangerous than it was thirty or forty years ago, it feels like a more perilous place. Or, more accurately, we inhabit the world today in a way that’s much more risk averse; for a variety of very interesting and nuanced reasons, our tolerance for risk, especially concerning our children’s safety, has steadily declined.So we remove jungle gyms from playgrounds, ban football at recess, prohibit knives (even the butter variety) at school, and would rather have our kids playing with an iPad than rummaging through the garage or roaming around the neighborhood.Unfortunately,...