Friday assorted links by Tyler Cowen July 28, 2023 at 11:47 am 1. Haidt and Gray on play deprivation as a cause of mental illness. 2. Some kind of weird story I don’t understand about an AER retraction. 3. “The SAT’s Predictive Power for College Grades is Systematically Underestimated Because of Range Restriction.” 4. Noteworthy observations on China and AI. 5. Markets in AI girlfriends. 6. “A female microscopic roundworm that spent the last 46,000 years in suspended animation deep in the Siberian permafrost was revived and started having babies in a laboratory dish.“