"Human beings had a play-based childhood from time immemorial," says author Jonathan Haidt. What caused teen mental health decline is "between 2010 and 2015, phones, screens come sweeping in...The most important thing that parents can do is delay the age at which their child gets immersed in internet culture."
Microsoft co-founder and philanthropist Bill Gates talks to Fareed about how AI can improve millions of people's lives through innovations in health care and education.