In this fourth Science Play book, Cobb explains the weighty subject of gravity with such ease that even the youngest kids will understand. Full color.

A simple but enjoyable story in which science plays a critical role.

Why does a magnet pick up a paper clip but not a leaf or a penny? How can the whole world be a magnet? Follow the step-by-step instructions about how to make your own magnet, and then find out for yourself what makes a magnet!