Discusses the sources of the world's water supply, methods of getting water from its source to where its needed, the dangers of pollution, and the need for conservation.
Explains solar energy and its use in solar water heaters, heat pumps, cookers, water distillers, and controlled photosynthesis. Includes simple experiments testing new solar energy theories.
Describes the physical characteristics, movements, satellites, and other features of Uranus, with an emphasis on recent discoveries from Project Voyager.