U.S. university teacher Ivanne Matthess, a member of a U.S. agricultural delegation, protects herself from the cold in a climatized office during a visit to a sugar refinery in Candelaria, Cuba, March 3, 2015. The most important U.S. agricultural delegation to visit Cuba in more than a decade began three days of meetings on Monday, hoping to find potential business partners, while urging the U.S. Congress to lift the U.S. embargo on trade with the island. REUTERS/Alexandre Meneghini (CUBA - Tags: AGRICULTURE BUSINESS COMMODITIES FOOD POLITICS)