A 1930s study found that the water in Galesburg, Illinois, helped prevent tooth decay because it contained what?

A 1934 New York taxi drivers' strike led which playwright to write "Waiting for Lefty"? A 1934 production of which Shakespeare play featured a young Orson Welles as Tybalt? A 1935 act of Congress gave which agency authority over motor carriers and drivers? Which 1935 Fred Astaire and Ginger Rogers film is named for a type of formal headwear? A 1935 film starring Peter Lorre adapted which Dostoyevsky classic? A 1936 dissent by Justice Harlan Stone accused six other justices of a "tortured construction" of which document? A 1936 fire in which city destroyed the prefabricated Crystal Palace? The 1936 operetta "The Headless Horseman" was based on which 1820 story?