For some topics a deeper understanding demands deeper investigations. Thatswhy this series takes an inquirybased approach to helping young readers makeobservati... » 

For some topics a deeper understanding demands deeper investigations. Thatswhy this series takes an inquirybased approach to helping young readers makeobservations about forces and motion in the world. Each book consists of fiveseparate experiments related to the titles and includes photographs andheadings in the form of questions. «