It 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 how maps and technology have changed the way people find their way from place to place. Full-color photos and a running timeline help show how changes in ways we travel and new technology have carried us from using to stars to today''s GPS turn-by-turn directions. A table of contents, glossary, further resources, and an index are included.