Gr 7 Up Students will find plenty of material in this thorough and interesting series. Speculative in nature, each book poses common questions about aliens and attempts to provide answers by drawing information from the fields of entertainment, science, and philosophy. Some dry chapters are loaded with statistics and scientific facts, and others, like those focusing on alien encounters, are downright creepy. These books are text heavy, with only occasional glossy images, and sidebars provide fun facts or insight into specific events or organizations. Extensive back matter makes these books great for report writers and those truly interested in the possibility of alien life.