What inspires a billionaire? In the case of Bill Gates, it's a 500-year-old manuscript penned by Italian genius Leonardo da Vinci.
And at $30.8 million, it was probably a bargain to the Microsoft founder, who considers it a priceless symbol of knowledge. Charlie Rose talks to Gates about the historic document -- the world's most valuable -- for a 60 Minutes story to be broadcast Sunday, May 12, at 7 p.m. ET/PT.
Gates won't entertain comparisons of his life to that of da Vinci, who conceived of airplanes and helicopters hundreds of years before … Read more