This 20-minute section of Pangea Day is about borders -- of all kinds. We start by traveling to Cuba with filmmaker Topaz Adizes in "The Americana Project: Cuba," where a family reunion has unexpected results. Then watch "Walleyball," by Brent Hoff, to see a game of volleyball as you've never seen it before. We go to Rio de Janeiro for a stirring performance by legend Gilberto Gil -- and a global sing-along!