In this preschool counting book about rockets, we go behind the scenes as we prepare the space shuttle for blast off as we count backwards from 12 to 1. It’s a very simple story with bright illustrations and h
When young Galileo, then a student at Pisa, noticed one day during divine service a chandelier swinging backwards and forwards, and convinced himself, by counting his pulse, that the duration of the oscillations was independent of the arc through which it moved, who could know that this discove...