In the Bible, who cut off Goliath's head after felling the giant with a stone from his sling?

After giving up writing novels, which author published "Wessex Poems" in 1898? Which leader of Chile's fight for independence died in exile in Peru on October 24, 1842? After he left office in 1953, which U.N. secretary-general returned to Norway and later served in its cabinet? After he returned home to Venice in 1295, which traveler was nicknamed "Il Milione"? Which noble gas comes right after helium in the periodic table? After helping Jefferson Davis make bail in 1867, which New York Tribune publisher lost about half his readers? After her 1956 wedding, which actress and her prince drove through the streets of Monte Carlo in an open-top car? After her brother Gianni died in 1997, which woman became head designer of his fashion label?