Which word means both a docked horse's tail and a short haircut for women popular in the 1920s?

Which opera diva was nicknamed "Bubbles"? What is the division of a group into opposing factions, like the Christian church in 1054, called? Which word means both a division of a play and the setting where it takes place? Which actor played DJ Dr. Johnny Fever on "WKRP in Cincinnati" and later headed the class on "Head of the Class"? What is a doctor who specializes in the care of the elderly called? A mock documentary called "Yankee Doodle Doctor" was made by the wacky medical staff on which 1950s-set sitcom? Complete the title of Errol Morris's 1988 documentary about Texas justice: "The Thin ___ Line". A documentary about which woman won a 1955 Oscar, and seven years later Patty Duke won an Oscar for playing her?