Describes the different types of killer ants that are found around the world, providing information on their habitats, behavior, physical characteristics, and the ways they help and hurt humans.
Traces the life and achievements of the inventor whose inventions include the electric light bulb, the phonograph, mimeograph machine, and the ticker tape machine.
Studies how the westward expansion of the United States was facilitated by the use of the country's many waterways, describing the different types of boats pioneers used to make their journeys, and discussing some of the reasons people were determined to go west.
Describes the efforts to save such animals as the black-footed ferret, the golden lion tamarin, and the California condor from extinction through programs designed to protect endangered species.
Describes the different types of killer ants that are found around the world, providing information on their habitats, behavior, physical characteristics, and the ways they help and hurt humans.
