DK Find Out! Amazing Inventions

Includes inventions such as 3-D printers, abacus, bicycle, compass, battery, first computers, flushing toilet, light bulb, microscope, inventions in the home, steam engine, telephone, telescope, television, wheel, and writing.

Steve Spangler Science: World's Simplest Motor, Vol. 1
Steve Spangler Science

This is the world’s simplest electric motor and building it requires some patience on your part.