Introduces the force of gravity, including how it works and the history of the theory.

Presents information of the outcome of individual battles and how the war finally ended.

Introduces electricity and its properties, including how a circuit works, where static electricity comes from, and how electricity works in the home.

Discusses the uses of radioactive substances and the dangers they present, including fallout from nuclear weapons testing and the meltdown of nuclear plants.

Describes the life and achievements of Barack Obama, from his childhood and early career in politics to his life as President of the United States.

Shares information about the national park, including what kinds of animals live there, what kinds of trees and flowers grow there, and ways people can protect the park.

"Learn all about Grand Canyon National Park, including how it was formed, which wildlife can be found there today, and how it is affected by environmental issues."--Provided by publisher.