On Saturday, January 5, Discovery Communications presented some of its upcoming programming at the Television Critics Association Winter 2013 Press Tour in Pasadena, CA, including Animal Planet’s Rhino Wars, Science Channel’s Stuff You Should Know and Discovery Channel’s  The President’s Gatekeepers.  Kicking off the morning with a little bacon brittle, courtesy of Destination America’s United States of Bacon, the room took in some of Discovery’s upcoming shows, with topics ranging from alien hand…