This book explores many other timely questions, such as how the first calendars and clocks were invented, why February is such an odd month, and what strange and wonderful things Einstein discovered about the nature of time itself.

• ISBN: 9780763641122
• Author: Jenkins, Martin
• Illustrator: Holland, Richard
• Published: 2009, Candlewick Press (MA)
• Themes: measurement, time
• Descriptors: Intermediate (ages 9-14), International, Nonfiction
• No. of pages: 64