Challen, Paul C

An explanation of addition for students in kindergarten through third grade, covering zero problems, doubles, plus one, and other topics.

Explains how volcanoes form, describes significant ones from history, and shows how to make one's own mini-volcano.

Provides information about hurricanes, also known as typhoons and cyclones; explaining what they are, how they form, and how they behave; discussing advances in technology that have made hurricane prediction more accurate; and looking at the effects of hurricanes, and how to stay safe in a storm.

Explains what tanks are and the many jobs they do, looks at the parts of a tank, and describes their weapons, capabilities, and personnel. Includes color photographs.

Offers insight into the history of communication in various regions throughout the ancient world, discussing spoken language, writing, sign language, translations, and other related topics.

Introduces forms of government developed and used by various ancient civilizations, examining a range of cultures from the ancient Chinese to the Vikings, and discussing caste systems, systems of city-states, democracies, monarchies, and other systems of government.

An introduction to the game of golf featuring many color photos. Describes how the game is played, equipment, golf course layout, and golfing skills.

Explores the sport of figure skating and outlines the many techniques used by those who practice this sport. Features full-color photographs and a glossary.

Helps young scientists learn how to create a hypothesis that can be tested and measured by their experiment.