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 [...]




