In the early 20th century dangerous and often poisonous chemicals were included in many common household products. Browse these pictures of medicines, liniments, moonshine and a cyanide furnace.
Corresponding educational resources for this photo gallery can be found on PBS LearningMedia.
In 1934, American polar explorer Richard Byrd became the first to experience winter in Antarctica's interior.
The story behind the development of the oral contraceptive that put women in control of birth control.
With data compiled from tens of thousands of sex questionnaires, Alfred Kinsey changed America's views about sex with the Kinsey Reports.
The tale of oil-seeking mavericks whose risk-taking, sweat and dreams changed an American industry.
Though first seen only as an expensive luxury, Alexander Graham Bell's telephone soon transformed American life and became a necessity.
Native Alaskans, oil company representatives, environmentalists, politicians, and others tell the story of the 800-mile pipeline.
In 1967, thousands of hippies flocked to San Francisco's Haight Ashbury district.
The unusual life of David Vetter, who lived permanently inside a germ-free environment due to severe combined immunodeficiency.