Flat Earth and Round Earth

Were Christopher Columbus's sailors afraid of falling off the edge of a flat world? Investigate this and other colorful ideas about the shape of the world, and learn how scientists finally developed a true picture of the size and shape of Planet Earth. Is it science? Shows the scientific method at work. Each volume in the series explores a branch of modern-science or a major scientific milestone, comparing and contrasting it with an older idea that has been proved wrong or fails to meet the standards of science.