Clifford, Tim

A science encyclopedia designed for middle school students, examining topics related to mathematics, explaining what mathematics is, and covering numbers, sets, ratios, statistics, algebra, geometry, measurement, and advanced math, with further reading sidebars and illustrations.

A science encyclopedia designed for middle school students, examining topics related to astronomy and space, explaining what astronomy is, and covering the solar system, stars, galaxies, the universe, space exploration, and people who study space, with further reading sidebars and illustrations.

Provides descriptions, photographs, and facts about the currencies used by the U.S. and other countries, including the European Union, Mexico, Canada, Japan, and others, and includes information about currency exchanges.

Teaches children what energy is, how it is used and measured, what role energy plays in the world, how people store and exert energy, and other related topics.

Introduces children to the objects found in the solar system, providing information on the sun and each of the planets and their moons.

Introduces children to the objects found in the solar system, providing information on the sun and each of the planets and their moons.

Simple text helps introduce young children to the subject of geology and its role in the world around them.

Briefly introduces the career of a forensic scientist through the story of a family's investigation into a missing science project.

Explains what money is, examines the practice of bartering, looks at different types of money that have been used throughout history, and discusses banking, currency exchange, and the possible future of money.