Kids need to play in the real world, not on their phones: NYU professor Jonathan Haidt

Johnathan Haidt, professor of Ethical Leadership at New York University, joins CNBC's 'Squawk Box' to discuss his new book, “The Anxious Generation: How the Great Rewiring of Childhood is Causing an Epidemic of Mental Illness,” why he believes smartphone and social media addictions are destroying our children's lives, his take on recent campus protests, and more.