While living in the U.S., which scientist was offered the presidency of Israel in 1952?

Complete the title of John Keats' 1819 ballad: "La Belle Dame sans ___." In a famous 1936-37 sit-down strike in Flint, Michigan, the United Auto Workers took on which company? Norse settlers began arriving around 874 on which North Atlantic island, which founded its Althing parliament in 930? Dutch elm disease devastated which North American tree, once a favorite for lining city streets? By tradition, no pope ever chooses which name? By weight, about 65 percent of the human body is which element? Which nomadic desert people of the Middle East are famed for breeding Arabian horses? Explorer Richard Byrd's polar career began with an expedition based at Etah, on which large Danish-ruled island?