Did Chinese sailors really discover America before Columbus? A new exhibition sets the scene, presenting new evidence that lends support to the assumptions made in "1421: The Year China Discovered America" by Gavin Menzies. "1421: The Year China Sailed the World," in Singapore in a special tent near the Esplanade (until Sept. 11), is primarily a celebration of Admiral Zheng He's seven maritime expeditions between 1405 and 1423. With a fleet of 317 ships and 28,000 men, Zheng He is generally acknowledged as one of the great naval explorers, but how far he actually went remains a matter of dispute. With original artifacts, videos and interactive exhibits, "1421" aims to take visitors through Zheng He's life story, setting the historical and economic context of his voyages. Against this factual background, Menzies's theories are presented, along with new evidence, mainly maps, backing his claims. The exhibition starts in Hunnan (China) in 1382, with a narrative space giving some background on Zheng He's youth. Zheng, a Chinese Muslim, was captured as a child in wartime by the Ming army and made a eunuch to serve at court. He became a scholar and a trusted adviser to the third Ming emperor, Zhu Di, who sent him on a mission to "proceed all the way to the ends of the earth to collect tribute from the barbarians beyond the seas." When the giant fleet returned in 1423, however, the emperor had fallen. With that change of leadership, China began a policy of isolationism that would last hundreds of years. The large ships were left to rot at their moorings, and most of the records of the great journeys were destroyed (though some argue the records still exist).