preside over crowds today in havana. he s on his last leg of his visit to cuba. before saying mass, he ll speak to cuban president raul castro. his brother fidel has requested a meeting as well. a key part of the health care reform law may be in jeopardy. the u.s. supreme court expressed different views on whether the government can require individuals to buy health insurance or face a penalty. today is the third and final day of the hearings. a ruling is expected in june. those are the top stories from cnn. i m monita rajpal. world business today starts right now. good morning. from cnn london, i m nina del santos. and a very good afternoon from cnn hong kong. i m andrew stevens. you re watching world business today. these are our top stories this wednesday. shares in totale fall after a major gas leak in the north sea. the oil giant says it could be months before the rig is back online. rupert murdoch s news corp. is hit by more allegations of hacking. this ti