In part 3, I present research showing that a phone-based childhood disrupts child development in many ways. I describe four foundational harms: sleep deprivation, social deprivation, attention fragmentation, and addiction. I then zoom in on girls[*] to show that social media use does not just correlate with mental illness; it causes it, and I lay out the empirical evidence showing multiple ways that it does so. I explain how boys came to their poor mental health by a slightly different route. I show how the Great Rewiring contributed to their rising rates of “failure to launch”—that is, to
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