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 Pet

 

              Vice President Joe Biden, center, and Brazil
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)