Clifford, Tim

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.

Briefly describes the career of a safari guide through the story of a boy and his family's safari in Kenya.

Reviews the history of U.S. coins and bills, looks at how coins and paper money are designed and made, explains how money is put into circulation, and describes efforts to prevent counterfeiting.

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

A science encyclopedia designed for middle school students, examining topics related to the Earth, explaining what Earth science is, and covering the parts of the Earth, forces that shape the planet, weather, habitats, the endangered environment, and people who study the Earth, with further reading sidebars and illustrations.

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

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

Looks at traditional methods used to pay for goods and services, examines the role of banks and credit unions in financial transactions, and describes some of the many different ways people use to pay without money, including checks, money orders, debit and credit cards, online payment services, and others.

Explains what the economy is and how it works in the United States, describes various aspects of the economy, including trade, employment, the stock market, real estate, taxes, and others, and discusses the role of the Federal Reserve in the economy, how the economy is measured, and the global economy.