AR Book Level
5.6
AR Points
3
Word Count
19,253
Interest Level
Middle Grades (MG 4-8)
Genre
Nonfiction
AR Quiz #
309739 EN
About this book
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.