A powerful earthquake off Japan triggered tsunami warnings as officials warn a potential 'mega-quake' could be next; ceasefire talks hit a stalemate as Middle East peace efforts suffer a setback; new details on the 8 children shot by a Louisiana father; singer D4VD is in court today to face charges a teenager's death; Nike is responding after backlash over an ad placed near the Boston Marathon finish line; and a brother-and-sister hug goes viral in a heartwarming moment. Watch more episodes of