Reading Metrics
Grade Level
Middle Grades (MG 4-8)
Book Level
5.6
Points
3.0
Fiction/Nonfiction
Nonfiction
Word Count
19253
Points per Word
0.000156
Description
This book tells why your ears stop you falling of your bike, how a little bit of gravity could make you lose your head and what can make your fillings explode. It also explains what keeps the moon in the sky, and how quickly your fingernails grow.