Table of Contents Using Tools in Science 4 Tools That Extend the Senses 10 Measurement Tools 22 Models as Tools 36 Scientific Tools Are Changing 42 Glossary 46 Index 48 3
CHAPTER ONE Using Tools in Science We all use tools to get things done To eat soup we use a spoon To move a heavy box we use a cart To sign our name we use a pen Every tool large or small exists to do a job DID YOU KNOW Tools have been helping people throughout history Spears and arrows aided ancient hunters Early farmers made use of simple plows For writing people once used hollow reeds and wing feathers 4
Tools Extend Us Tools allow us to do things beyond our natural abilities Some tools extend our physical strength our reach and our speed Other tools expand the limits of our senses Still others provide us with added brain power The tools we use to measure things help increase our understanding of the world 5
