December 16, 2008 11:52 am Who Knew? Virtual Colonoscopy Did you know that virtual colonoscopies can be used to screen for osteoperosis? 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