Mobiles: Building and Experimenting With Balancing Toys (A Boston Children's Museum Activity Book)

Seals balance balls on the ends of their noses. Ballerinas balance their bodies on the tips of their toes. And mobiles hang perfectly because they, too, balance. Learn all about the scientific principles that allow a gymnast to perform incredible tricks on the balance beam and an acrobat to walk easily across a thin wire. Illustrated.