If animals evolved through natural selection, then our bodies are undoubtedly home to numerous "evolutionary leftovers" known by the technical name "vestigial o

"This book is only for people who like joy, absurdity, passion, genius, dry wit, youthful folly, amusing historical arcana, or telescopes." —Rivka Galchen, au

With step-by-step directions, lessons, projects, cooperative learning activities and more, here are reproducible cut-and-paste patterns for assembling and under

Learn about the human body—from head to toe! Take a trip inside the human body and discover the amazing systems that allow us to move, breathe, and speak. Adv