"Once you are aware of the wonder and beauty of earth, you will want to learn about it," wrote Rachel Carson, the pioneering environmentalist. Rachel found many adventurous ways to study nature. She went diving to investigate coral reefs and tracked alligators through the Florida Everglades on a rumbling "glades buggy." However, one of the bravest things she did was to write and publish <i>Silent Spring</i>, a book pointing out the dangerous effects of chemicals on the living world. Powerful men tried to stop publication of the book, but Rachel and her publishers persisted, and <i>Silent Spring</i> went on to become the book that woke people up to the harmful impact humans were having on our planet.