Blaine and Tracey had thought they were in for the worst summer of their lives when they arrived at Uncle Cecil’s house. They soon discovered that their eccentric uncle and his inventor assistant had other plans in store. The unconventional duo had created invisible zip lines for the twins to use as they traveled around the globe to learn all about science. In the first leg of their journey, The Sassafras Science Adventures Volume 1: Zoology, they discovered the amazing world of animals. In this volume, the twins (and you) will learn all about the different systems of the human body as they zip to an ancient tomb in Ethiopia, a garbage landfill in Texas and more. Don’t miss a minute of their summer-long, science-filled zip line journey!