Inventions and discoveries, innovations, and famous personalities are all intriguing, but some are far more than that. Many have actually changed the course of history! They Changed the World focuses on significant inventions, influential ideas,and important people who have changed the fabric of society forever. Each self-contained unit contains a highly informational reading plus student-directed activities that will help them to better understand the impact of that particular mini-unit's focusReadings and assignments can be given as homework, classroom work, or extra-credit projects or may be combined into three complete social studies packets. A complete answer key is included for teacher convenience.