Kerri Greenidge discusses two books about African-Americans in the years before the Civil War, and Neal Gabler talks about “Catching the Wind,” his biography of Edward Kennedy.Soon, you’ll need a subscription to keep full access to this show, and to other New York Times podcasts, on Apple Podcasts and Spotify. Don’t miss out on exploring all of our shows, featuring everything from politics to pop culture. Subscribe today at nytimes.com/podcasts.