Four years ago, schools and businesses were shutting down and Covid was changing life as we know it. In his new book “2020: One City, Seven People, and the Year Everything Changed," sociologist Eric Klinenberg examines the events of 2020 through the eyes of seven New Yorkers. The NYU professor joins Hari Sreenivasan to discuss the tumultuous year 2020 and why we must not forget its impact.