Which wood, the lightest used commercially, is used to build model airplanes and some kinds of buoys?

The Judiciary Act of 1869 fixed the number of U.S. Supreme Court justices at how many? "The Key Reporter" is published for members of which academic honor society? Which 1922 novel ends with Molly Bloom's words "yes I said yes I will Yes"? Which South American water boa is the world's heaviest snake, with some reports claiming lengths of more than 30 feet? The finely divided underwater leaves of water milfoil are especially suited to absorbing which gas? The lutz, a jump named for Austrian skater Alois Lutz, is performed in which sport? The Mercalli scale rates the intensity of which natural events from I to XII? In Longfellow's epic poem, Minnehaha is the beloved of which hero?