IN MEMORIAM: It is with great sadness that we mark the passing of Gerald Weissmann (August 7, 1930 – July 10, 2019), four of whose remarkable essay collections we had the honor of publishing: The Fevers of Reason, Epigenetics in the Age of Twitter, Mortal and Immortal DNA, and Galileo’s Gout. His extraordinary erudition and keen wit graced everything he wrote. His dedication to engaging “the two cultures” of the arts and the sciences in fruitful, even revelatory, dialogue epitomized our mission and served as a constant source of inspiration.