In 1974, four engineers from Pilot Pen Corporation invented a "dustless chalkboard." Their invention has become one of the most popular drawing toys, with more than 40 million sold since its introduction. Countless children have enjoyed playing and learning with it.

This wonderful invention is the Magna Doodletm!

Magna Doodle

In this edition of HowStuffWorks, we will take a look inside this fascinating toy.