LIGHT Visible and Invisible Author:Edward Ruechardt Light is the scientist's most useful tool. This book sums up what we know today about the nature and behavior of light, how we found out, and the astounding things science has done with light. — The author, using 137 illustrations, explains light waves, X-ray, why the sky is blue, how light weighs stars and cooks food---and many more of the secr... more »ets of visible and invisible light.« less