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A 72-page manuscript that the great 16th century artist Leonardo Da Vinci used to draw diagrams, writings and sketches was bought by Microsoft’s co-founder Bill Gates for $30 million in 1994.

Philanthropist Bill Gates participates in a talk with former President Bill Clinton about debt at the 2013 Fiscal Summit in Washington, Tuesday, May 7, 2013. (AP Photo/Charles Dharapak)

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