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About Time: A First Look at Time and Clocks

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Once, time was undefined--no one knew the difference between a minute, an hour, or a day. People started creating tools to measure time. First they used the sun, the moon, and the water. Soon after, they began to build clocks and create calendars.
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Product # 22538-G
Author Bruce Koscielniak
Grade Level 4-6
Interest Level 2-3
Fiction/Nonfiction Nonfiction
Lexile Level 1200
Publisher Houghton Mifflin