Introduction from Jon Haidt and Zach Rausch:When smartphones and social media platforms swept into teens' lives in the early 2010s, schools experienced their own digital revolution, with 1-to-1 laptops, tablets, and iPads becoming staples in classrooms across the Western world. (1-to-1 means one device for every student.) A decade later, the revolutionary optimism is fading. A recent OECD review found that most educational technology (EdTech) has not delivered the academic benefits once promised...