As the kids continue to test the limits of human exhaustion we discuss the much maligned zombie body. If you\u2019ve ever asked a zombie, \u201cwhat keeps you going?\u201d you\u2019ve probably gotten a variety of answers that rhyme with the sound you make when phlegmatically exhaling. That\u2019s why we asked doctors and other experts instead! Other things we mention that are totally related: hibernating bears, leprosy, drinking blood, and morse code.