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12:30
In 1963, Rachel Carson’s Silent Spring sparked a government investigation into pesticides
1:00
Having started Circus during the Civil War, Forepaugh became Barnum's biggest competitor.
15:13
An interview with author Kirstin Downey on labor rights activist Frances Perkins.
0:55
The Paiute people built sophisticated irrigation canals to channel water in California.
1:48
Beginning in the 1930s, large dams were built on important watersheds.
0:44
Dr. Joseph Kinyoun was a leader in the diagnosis and prevention of infectious diseases.