Reading Metrics
Grade Level
Middle Grades (MG 4-8)
Book Level
7.2
Points
1.0
Fiction/Nonfiction
Nonfiction
Word Count
7880
Points per Word
0.000127
Page Count
48
Points per Page
0.020833
Description
Describes a variety of record-breaking machines and inventions, including the fastest train, the first mechanical clock, and the largest airships ever built.