Author claims Da Vinci's drawings based on Chinese technology

Gavin Menzies, who in 2002 theorized that the Chinese reached the America's 7 decades before Columbus, has a new theory: Leonardo da Vinci's drawings were based on scientific encyclopedias brought to Italy in 1430 by a Chinese fleet.

"I argue in the book that this was the spark that really ignited the renaissance and that Leonardo and (Italian astronomer) Galileo built on what was brought to them by the Chinese," said Menzies in a recent interview.