A Meeting of the Minds

-- PHOTO MOVED IN ADVANCE AND NOT FOR USE - ONLINE OR IN PRINT - BEFORE JAN. 28, 2018. -- From left, Steven Pinker, a professor of psychology at Harvard University and the author of 10 books, at a lunch with Bill Gates, the entrepreneur turned philanthropist, in Kirkland, Wash., Jan. 18, 2018. The two men discussed the surprising arcs of their careers, the work that lies ahead to ensure continued human progress and the challenge of creating the perfect toilet. (Chona Kasinger/The New York Times)