Time has fascinated humans for thousands of years. We have struggled to find ways to keep track of time and predict patterns in nature. Ancient people watched t

Help students learn how to keep track of time! This engaging book explores how calendars help us to keep track of days, weeks, months, and years. The simple sen

Learn how to keep track of time! This engaging, social studies reader explores how calendars help us to keep track of days, weeks, months, and years. The simple