In How Things Work,

you will discover fascinating facts

about the things we use every day.

Learn about:

Gears, gizmos, and gadgets --

and how they are used to operate machines

The invisible forces of electricity and magnetism

The people who invented many

of the things we take for granted

The amazing beam of light called laser --

and how we use it

X-ray machines -- and the way they take pictures

Batteries -- how and why they work

Derrydale, How Things Work

ISBN 0-517-11896-3

Go on to the How Things Work Project Home Page ...