An education columnist for the Washington Post, Jay Mathews, joins Education Next editor-in-chief Marty West to discuss Mathews' new book, "An Optimist’s Guide to American Public Education," and The Challenge Index, Mathews' annual ranking of American high schools.An excerpt from the book, "What I Learned in 23 Years Ranking America’s Most Challenging High Schools," by Mathews, is available now.https://www.educationnext.org/what-i-learned-in-23-years-ranking-americas-most-challenging-high-schools/