August 16, 2013 3:40 am Panda Pregnancy Watch The Smithsonian’s National Zoo is back on a 24-hour panda pregnancy watch, as zookeepers try to determine if Mei Xiang is expecting or experiencing a false pregnancy. US & World Videos 3:26 Confrontations occur at UCLA campus amid ongoing protests 0:57 Fights break out at UCLA between pro-Palestinian, pro-Israel supporters 8:39 Gina Rodriguez gushes 0ver motherhood with son Charlie 2:22 Scarlett Johansson and Colin Jost have date night at White House Correspondents' dinner 1:37 Pro-Palestinian protesters gather outside White House correspondents' dinner