In this engrossing and accessible book, Doug Macdougall explores the causes and effects of ice ages that have gripped our planet throughout its history, from th

Summary: Inspired by photographs of ice in primarily natural forms, writers Jane Yolen, X.J. Kennedy, Lee Bennett Hopkins, and others capture their thoughts in

Laugh and learn with fun facts about prehistoric mammals including saber-toothed cats, dire wolves, giant horses, Stone Age humans, and more—all told in Dr. S

From the author of Apocalyptic Planet comes a vivid travelogue through prehistory, that traces the arrival of the first people in North America at least twenty