W. Eric Martin has written articles for more than 50 publications and has provided dictionary entries for Thomson Gale's World of Computer Science. He is a coauthor of Tools of Timekeeping. They both live in Blackstone, Massachusetts.
Timekeeping: Explore the History and Science of Telling Time travels through the past and into the future to explore how humans have measured the passage of time. From ancient civilization's earliest calendars and shadow clocks to GPS and the atomic clocks of today, in Timekeeping, kids will track the evolution of timekeeping devices, meet the inventors of calendars and clocks, and learn interesting facts and trivia. Hands-on projects and activities include making a shadow clock,...View