For a child, is the world mostly a big playroom or mostly something to fear? Writer (and parent) Lenore Skenazy tells us how dramatically things have changed:

Kids are being treated like babies for even longer stretches. When Jonathan Haidt, co-author of The Coddling of the American Mind, gives lectures, he often asks audience members born before 1982 to shout out what age they were first allowed to leave the house on their own. Many in the crowd answer eight, seven, or even six. (Personally, I shout “Five!”)

Then, skipping the mishmash of Generation X, he asks everyone born after 1995 to answer the same question, and most of the millennials respond in the 10-13 age range. “The effect is always huge,” says Haidt, a co-founder with me of Let Grow, the nonprofit dedicated to making childhood independence easy, normal, and legal.