9It is said that necessity is the mother of invention. But time is the driver of technological development. See how the inventions we use every day, from cars to cell phones, have evolved from their birth to today's technological advancements. A running timeline on each page makes this series perfect for supporting STEM topics in the elementary grades. This book for elementary readers highlights the evolution of space travel, from the very first satellite to today's plans to send people to Mars. Engaging photos and a running timeline highlight important space travel missions through history, including the Apollo missions, the space shuttle program, and the International Space Station. A table of contents, glossary, further resources, and an index are included.