1421 - The year when China opened the world

The period of great geographical discoveries is one of the most important stages in the history of civilization, but even in the XXI century. Do we know everything about the discoverers of various continents? Were the Columbus and Magellan really the first in their travels and discoveries? Or did it happen much earlier?
The sensational book of Gevin Menzis (1937-2020) talks about the beginning of the great geographical discoveries, while, according to the theory of the author, the Chinese navigators of Admiral Zheng He for 100 years ahead of their European rivals. The most ambitious Chinese expedition, composed of four fleets, began in 1421. In 2003, this book became a bestseller according to the New York Times, was translated into dozens of languages, and the total circulation exceeded 1,000,000 copies!
Who would have thought that in the era of the Min dynasty, Chinese sailors were the first to discover Australia, New Zealand, America, Antarctica and the North-East pass? Is it possible that the Chinese back in the 15th century. Have you made a trip around the world? Could medieval Chinese vessels get to Greenland to get to the North and South poles? Whether China had in the first quarter of the 15th century. The corresponding potential and material and technical opportunities for round-the-world expeditions?
The latter of the ships that survived in distant sea wanderings returned to China in the fall of 1423. There are almost no evidence, only the cards discovered by the author, confirm the Chinese trace in great geographical discoveries.
Havin of Menzis still cause fierce disputes among scientists. Many consider his book an alternative story, but whether this is so, to decide readers. For a great contribution to the propaganda of the culture of China, Menzis was awarded the title of Honorary Professor of Yunnan University in China