Psychologist Peter Gray argues that school stress, not smartphone use, is the main driver of the teen mental health crisis, challenging Jonathan Haidt's thesis (Kaitlyn Tiffany/The Atlantic)

Kaitlyn Tiffany / The Atlantic : Psychologist Peter Gray argues that school stress, not smartphone use, is the main driver of the teen mental health crisis, challenging Jonathan Haidt's thesis — An evolutionary psychologist is challenging the popular understanding of kids and technology.