Mexican billionaire Carlos Slim looks on before he gives a speech at Mexico's school of engineers during an event to mark the 50th anniversary of his engineering degree, in Mexico City May 28, ... more 
Mexican billionaire Carlos Slim looks on before he gives a speech at Mexico's school of engineers during an event to mark the 50th anniversary of his engineering degree, in Mexico City May 28, 2013.REUTERS/Henry Romero less 
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Reuters | Photo By � Henry Romero / Reuters / Reuters
Tue, Sep 10, 2013 10:34 PM EDT