Why do more than half of American adults and more than 75 percent of young Americans believe in intelligent extraterrestrial life? Diana Walsh Pasulka spent six years interviewing influential scientists and Silicon Valley entrepreneurs who believe in extraterrestrial intelligence. She has explored spiritual phenomena, visited the purported UFO crash sites of New Mexico and roamed the archives of the Vatican. She argues that widespread belief in aliens is due to a number of factors, including their prevalence in modern media-from "The X-Files" to the search for planets that might support life. Pasulka explores the connections between religion, technology and extraterrestrial life and examines how people interpret the unexplainable in our strange and sometimes mysterious world.