Scientists and inventors have created all kinds of machines and technologies that help people travel, communicate, and stay healthy. This fascinating series offers young readers an up-close look at eight important inventions. Each book walks readers through the invention's history, the science behind how it works, and how the invention has changed people's lives. This book reveals the fascinating history of vaccines, from when they were first invented to the latest innovations, as well as the changes they've created in people's lives. The book also includes a table of contents, fun facts, a That's Amazing special feature, quiz questions, a glossary, additional resources, and an index. AGES: 7 to 10