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. Elementary readers will follow the sequence of how wireless technologies have brought us from the first Morse code radio transmission to today's "Internet of Things." Engaging photographs and a running timeline illustrate important inventions that have changed the way we use radio waves, from Bluetooth connections to cell phones. A table of contents, glossary, further resources, and an index are included.