TABLE OF CONTENTS CHAPTER 1 Amazing Devices 4 CHAPTER 2 How They Work 12 CHAPTER 3 A World of Networks 16 ACTIVITIES TOOLS Try This 22 Glossary 23 Index 24 To Learn More 24
CHAPTER 1 4 CHAPTER 1 AMAZING DEVICES We use cell phones for many things Games Pictures Music They are amazing
CHAPTER 1 5 We use them to call people And we can use them to check social media Our phones keep us connected But how do phones connect
