What is Greenwich Mean Time (GMT)?
Why does a week have seven days?
Is time travel possible?
Read Time to find out the answers to these questions and more. Each book in the Measure It! series explores how we measure, both in science and in the real world. You will learn about the different devices used in measuring, the metric and imperial measurement units (and how to convert between the two), and the history of many common measuring systems. Finally, apply your new measuring talent to some challenging word problems!
Heinemann Infosearch asks the questions you want answered. Each chapter starts with a different question and gives a detailed answer.
Table of Contents
What Is Time? 4
How Is Time Divided? 6
Why Does a Week Have 7 Days? 10
What Do We Use to Measure Time? 12
How Much Time Has Passed? 18
How Do You Master Time? 20
Is Time Travel Possible? 24
How Do Scientists Measure When Dinosaurs Lived? 26
A Timeline of Time 28
Answers to You Do the Math 29
Find Out More 31