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Table of Contents Early Communication 4 What Are Waves 9 Electromagnetic Radiation 15 Technology and Communication 24 Modern Communication 35 Timeline 45 Glossary 46 Index 47 Show What You Know 47 Websites to Visit 47 About the Author 48
Early Communication What do you do when you want to talk to a friend across town Text Call Both are simple to do but think about how people communicated before technology harnessed the power of electromagnetic waves Written communication has been used since ancient times The Phoenicians an ancient civilization developed a simple alphabet Another ancient civilization the Sumerians used picture writing 4 Sumerian cuneiform is the earliest known writing system dating back to about 8000 BCE It developed from the pictographs and other symbols used to represent trade goods and livestock on clay tablets
