Fascinating podcast. The happiest person I know is my youngest brother in law. He has Down syndrome and at 34 years of age, watching Disney movies all day in his bedroom. The smartest person I know is his oldest brother in law. Perfect SAT score, full ride scholarship, but due to various issues he flunked out of college. He now drives a truck for a living, which is a massive achievement based on how bad things got. I wish we could do more research on group differences. Some groups in America are not doing well, whatever the cause, genetic or cultural. To ignore the differences is a disservice to them.