Chinese map collecter has found a copy of an ancient map he claims proves controversial theories that famed Chinese mariner Zheng He was the first person to discover America and circumnavigate the world. Liu Gang said the map supports the recent theories that Chinese discovered America before Christopher Columbus and charted parts of the world such as Antartica and northern Canada long before Western explorers. "The map shows us that Chinese discovered the world 70 years before Columbus," Liu said in a public unveiling of the chart. "The map tells us that Zheng He discovered the world." The map is...