Hardcover book for grades 5-10. A great book for those interested in the compelling tales of all of humankind's greatest milestones in science and engineering, and the risks and courage on the part of the innovators. Starting with Stone Age tools and ending with a Hadron Collider, each chapter details a historic leap forward in scientific understanding and explains what the potential downsides of those discoveries were. Potential catastrophic consequences include persecution for heresy, the very real risks of self-injury or death in the process of discovery. The book is from a smoke and pet free home.