Saudi Arabia's King Abdullah bin Abd al-Aziz arrived in NYC on Tuesday for a medical stay and now he's "recovering" after surgery. The 87-year-old leader of the world's top oil-producing country, who had a blot clot form on a slipped disc and needed treatment, reportedly had a "successful operation." His brother, Crown Prince Sultan, also in his 80s, is in charge of the country, but is also described as "frail"; Reuters says, "The kingdom is keen to show its allies in Washington and elsewhere there will be no power vacuum as health problems beset its octogenarian rulers, but the question of whether a reformist or a conservative will take over remains a matter of concern."