David J. Linden is a professor of neuroscience at Johns Hopkins University. He is the author of “The Accidental Mind: How Brain Evolution Has Given Us Love, Memory, Dreams, and God.” His second book was “The Compass of Pleasure: How Our Brains Make Fatty Foods, Orgasm, Exercise, Marijuana, Generosity, Vodka, Learning, and Gambling Feel So Good.” And now Dr. Linden has released “Touch: The Science of Heart, Hand and Mind.” He was in the Northwest to speak at Town Hall Seattle, presented by Town Hall and University Book Store, as part of The Seattle Science Lectures.