U.S university students stand beside a Cuban flag after arriving in a cruise ship at Havana harbor December 9, 2013. A cruise ship carrying 648 mainly U.S. students arrived in Havana on Monday for a ... more 
U.S university students stand beside a Cuban flag after arriving in a cruise ship at Havana harbor December 9, 2013. A cruise ship carrying 648 mainly U.S. students arrived in Havana on Monday for a two day stay as part of an educational program called Semester at Sea. REUTERS/Enrique de la Osa (CUBA - Tags: EDUCATION SOCIETY MARITIME POLITICS) less 
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Reuters | Photo By ENRIQUE DE LA OSA / REUTERS
Mon, Dec 9, 2013 2:18 PM EST