Obama spars with Cuba's Castro over human rights in historic visit

By Matt Spetalnick and Frank Jack Daniel HAVANA (Reuters) - U.S. President Barack Obama pushed Cuba to improve human rights during his historic visit to the Communist-led island on Monday, publicly sparring with President Raul Castro who showed flashes of anger and hit back at U.S. "double standards". Obama praised Castro for openly discussing their differences but he said a "full flowering" of the relationship would happen only with progress on the issue of rights. "In the absence of that, I th