TABLE OF CONTENTS CHAPTER 1 What Makes Us Sick 4 CHAPTER 2 Studying Germs 6 CHAPTER 3 How Germs Spread 10 ACTIVITIES TOOLS Try This 22 Glossary 23 Index 24 To Learn More 24
CHAPTER 1 WHAT MAKES US SICK Have you ever had a cold Maybe you’ve had a stomach bug What causes these illnesses For most of history people did not know
There were many Some thought evil spirits caused disease Others thought bad smells did We now know that germs cause sickness theories Like what germ
