I’m not saying that 11-year-olds should be kept off the internet. I’m saying that the Great Rewiring of Childhood, in which the phone-based childhood replaced the play-based childhood, is the major cause of the international epidemic of adolescent mental illness. We need to be careful about which kids have access to which products, at which ages, and on which devices. Unfettered access to everything, everywhere, at any age has been a disaster, even if there are a few benefits.