Science matters

Presents an introduction to water power, in simple text with illustrations, including information on water power in history, hydroelectric damns, tidal power, steam power, and related topics.

Introduces young readers to wheels and axles, explaining what they are, how they work, what they have been used for throughout history, and how they might be used in the future.

Introduces young readers to inclined planes, explaining what they are, how they work, what they have been used for throughout history, and how they might be used in the future.

Explains the physical properties of the moon and the use of moon phases to create the lunar calendar.

An introduction to clouds, using photographs, diagrams, and experiments to discuss the study of clouds, how they form, their classification and types, storm clouds, pollution, and the role of clouds in protecting Earth. Includes a profile of atmospheric scientist Dr. Anthony DelGenio.

Illustrations and simple text describe the Northern Lights, how they form and the different types of Northern Lights such as the Auroral arcs, corona, curved arcs, and rayed bands.

Illustrations and simple text describe the various constellations in the sky, constellation myths and signs, the Zodiac, and famous astronomers.

Explains the physical properties of the sun and discusses the effects of sunlight on people and objects on Earth.

Explains the physical properties of stars and discusses the origin of constellations.