Reading Metrics
Grade Level
Middle Grades (MG 4-8)
Book Level
5.2
Points
1.0
Fiction/Nonfiction
Nonfiction
Word Count
3377
Points per Word
0.000296
Page Count
32
Points per Page
0.03125
Description
This book discusses the history of the clock, from records of the passage of time on cave walls from 18,000 B.C. to the LED and LCD digital displays of modern timekeeping.