How did Mayan astronomers know when it was the first day of spring? How did the Greeks tell time with water? When did the Chinese pass on the secret of paper-making? Find the answers to these and many other intriguing questions in the pages of Ancient Science. Science author Jim Wiese helps kids understand the science behind the innovations and discoveries of the past with numerous activities that show kids how to do everything from making soap the way the ancients did, to building a diving bell, to navigating by the North Star. In addition to these exciting activities and experiments, the book includes Ancient Science in Action sidebars, fascinating facts about the past, and tips on how to turn an experiment into a science fair project.