Reading Metrics
Grade Level
Middle Grades (MG 4-8)
Book Level
7.2
Points
2.0
Fiction/Nonfiction
Nonfiction
Word Count
9416
Points per Word
0.000212
Page Count
48
Points per Page
0.041667
Series
10: Physical Science
Description
This book discusses the ten most revolutionary inventions, such as the bow and arrow, steam engine, and wheel.