Briefly explains the function of the dam that is located between Brazil and Paraguay and the amount of electricity generated by it.

A brief biography of the First Lady, spouse of Franklin D. Roosevelt, who is particularly known for her work for human rights.

Provides a biographical sketch of Eli Whitney and a description of his most famous invention, the cotton gin, which made the harvesting of cotton easier.

Introduces the life of a woman who escaped slavery, traveled and made speeches to help free slaves before and during the Civil War, and helped freed slaves to find jobs and houses after the war.