Kathlyn Gay

Discusses the theories of ancient Greek philosopher-scientists such as Ptolemy, Pythagoras, Hippocrates, and Aristotle, and describes some of the scientific discoveries attributed to the Greeks and their impact on modern science.

In 1949, Mao Zedong came to power in China after a long and brutal civil war. He and his Chinese Communist Party immediately set out to transform their nation into a Communist state. They seized land from wealthy and middle-class farmers and distributed it to poor peasant farmers. The government also took over ownership of all industries. Citizens who resisted these changes were branded counterrevolutionaries," and thousands were imprisoned or executed....

Covers events leading up to the Korean War, the conflict itself, and its effects.

Considers the various ways children have escaped from Communist Cuba and found refuge in the United States through different plans set up to help them, from the early 1960s to today.

Describes where and how scrap metal is processed and its many subsequent uses.

Examines potentially dangerous chemicals, gases, and metals that can unknowingly endanger people in their homes, schools, and workplaces and destroy the environment.