Big foot! Yeti! Does this creature exist?High-interest topics, real stories, engaging design and astonishing photos are the building blocks of the XBooks, a new series of books designed to engage and motivate reluctant and enthusiastic readers alike. With topics based in science, history, and social studies, these action-packed books will help students unlock the power and pleasure of reading... and always ask for more!Formidable footprints found! Something enormous is out there. It¿s too big to be human. It must be a...