"Humor, like pornography, is famously difficult to define. We know it when we see it, but is there any way to figure out what we really find funny? In this fascinating investigation into the science of humor and laughter, neuroscientist Scott Weems uncovers what's happening in our heads when we giggle, guffaw, or double over with laughter. Beginning with the premise that humor arises from inner conflict in the brain, Weems explores such issues as...