Vice President Joe Biden, center, and Brazil's state-run oil company Petrobras CEO Maria das Gracas Silva Foster, right, look at a technician, left, in a gas injection laboratory at Petrobras research... more 
Vice President Joe Biden, center, and Brazil's state-run oil company Petrobras CEO Maria das Gracas Silva Foster, right, look at a technician, left, in a gas injection laboratory at Petrobras research facility in Rio de Janeiro, Brazil, Wednesday, May 29, 2013. Biden is in Brazil on the last leg of a six-day swing through Latin America and the Caribbean to boost trade, security and diplomatic relations. (AP Photo/Pilar Olivares, Pool) less 
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Associated Press | Photo By Pilar Olivares, Pool
Thu, May 30, 2013 12:40 PM EDT