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John Muir convinces Teddy Roosevelt to preserve Yosemite; journalist Marjory Stoneman Douglas fights to protect the Everglades; Native American activists occupy Alcatraz.
Will Ferrell and Seth Rogen star in this episode about how teenage writer Mary Shelley created her legendary novel, "Frankenstein".
Moses Fleetwood Walker faces racism in the 19th-century MLB; the Chicago White Sox are accused of intentionally losing the 1919 World Series; the Callaghan sisters inspire the film "A League of Their Own".