"Part IV, "Artificial Intelligence," attempts to tackle various conspiracy theories and alternate worldviews, including the so-called Moon Landing Hoax, Young-Earth Creationism, Immanuel Velikovsky's book "Worlds in Collision" (which asserts that a relatively young Venus was once a part of Jupiter), extraterrestrial claims regarding unidentified flying objects (UFOs), and astrology.In "Appalled at Apollo," the section devoted to Moon landing hoax conspiracy theories, Plait examines aspects of the hoax theory and compares its claims against basic laws of physics.