Ira Maximilian Freeman

Defines and gives examples of light and radiation and explains how light is refracted, reflected, and how it travels.

Describes how man learned about the chemicals that influence health, growth, disease, and industry.

Explains what scientists have discovered about sound through musical instruments, electronic devices, and living creatures.

Alphabetically arranged terms relating to space flight and astronautics are illustrated, defined, and discussed. Includes cross references to related terms.