Greta Gerwig tells David Remnick that her adaptation of the novel “Little Women” didn’t need much updating for 2019: the world hasn’t changed as much as we might think, she says. Isaac Chotiner talks with Jack Goldsmith, the conservative legal scholar whose new book is a surprising and personal account of a man who was regarded as a suspect in the disappearance of Jimmy Hoffa. And the creator of HBO’s “Watchmen” tells Emily Nussbaum about the uncomfortable process of learning to write about race.