If you believe the doomsayers, a zombie apocalypse is coming, and you need to be prepared. On AMC's 'The Walking Dead,' whose season finale airs Sunday, survivors are always worried about running out of bullets, arrows or even sharp sticks. But what if chemistry could help you get away from the flesh eaters? In the American Chemical Society's latest Reactions video, we talk with chemist Raychelle Burks, Ph.D., who shares her recipe for a 'death cologne' that might someday save you from the undead. The video is available at http://youtu.be/SUEjmyisz7c.