The search for extraterrestrial intelligence is compellingly presented is this informative and accessible volume. Beginning with a description of the first reports of UFO sightings (and with a list of credible natural explanations for the phenomenon), the author moves on to describe the relevant work of several contemporary scientists. Astronomers, evolutionary biologists, oceanographers, planetary geologists, and astrophysicists alike strive to understand life in extreme environments, from hostile habitats on earth to destinations in space about which little is known. Sidebars highlighting several of the featured scientists from around the world convey their dedication, endless curiosity, and impressive academic credentials as they work at the cutting edge of their field. Despite difficulties, from failed fieldwork to a lack of funding, these men and women are clearly driven to search for answers to provocative questions about life on earth and beyond. (Ages 9–14)