A man stands in line at Miami International airport to board a charter flight to Havana, Cuba. Travelers often fly to Cuba from the U.S. with piles of goods, despite a decades-long trade embargo. David Gilkey/NPR hide caption

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With Cash And Fat Fryers, Americans Feed Cuba's Growing Free Market

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Each dot represents one case of mumps between late June 2009 and late June 2010. The New England Journal of Medicine hide caption

toggle caption The New England Journal of Medicine