Describes the physical characteristics, behavior, and life cycle of flies and discusses some of the different kinds.

Provides information about the ancient Maya, discussing farming, daily life, beliefs, and other related topics.

Discusses the meaning and purpose of a constitution; recounts reasons why people thought the United States needed one in the 1780s and the events of the Constitutional Convention; and describes the Constitution's main points and how it has changed.

Explains the functions and parts of the digestive system.

Discusses steps to keep to food safe and food poisoning.