As part of his plan to conquer the universe in a 1940 movie serial, who spread "Purple Death" dust over Earth?

Completing the first voyage through the Northwest Passage, which Norwegian explorer reached Nome, Alaska, in 1906? As part of his New Deal, which president took American currency off the gold standard in 1933? As part of his 1676 rebellion, which Virginia planter captured and burned Jamestown? In March 2000, which pope made a historic pilgrimage to Jerusalem at age 79? As part of which crisis did John F. Kennedy announce a naval blockade on October 22, 1962? Since Pennsylvania had no coast, William Penn was given land in 1682 that later became which small state? In 2001, President George W. Bush asked American children to send $1 each to help children in which country? As President Beck, which actor tells America that the sky is falling in 1998's "Deep Impact"?