We're left wondering, what would happen if you were to treat a good idea like an infectious disease? Could you trace it back to one individual, and one flash of insight? Jon Mooallem tells us about his quest to track down the origin of the high five--a story that starts ...

Jon Mooallem explores homosexual activity in the animal world—from albatrosses to flamingos, bison, and even warthogs. He looks into what humans perceive as “natural” behavior, and examines how various forms of homosexual activity has been documented in over 450 different species. His article “Can Animals Be Gay?” appears ...