The cultural critic Doreen St. Félix goes to Madame Tussauds with Justin Kuritzkes, the début author of the novel “Famous People,” to talk about the nature of celebrity. Jia Tolentino heads for the children’s section of a bookstore with Rivka Galchen to compare notes on the kids’ books that still inspire them. And Jelani Cobb recommends three recent works of history that shed light on our current moment.