[Answer] Bill Gates spent more than $30 million for a notebook written by whom?

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Bill Gates spent more than $30 million for a notebook written by whom?

• Leonardo da Vinci:In 1994, Bill Gates purchased Leonardo Da Vinci's “Codex Leicester,” a manuscript that dates back to the 16th century. The Microsoft cofounder paid $30.8 million for the journal at auction, a price that made it the most expensive book ever sold. Written between the years of 1506 and 1510, the 72-page notebook provides a rare glimpse inside da Vinci's mind, complete with sketches, diagrams, and early iterations of ideas about astronomy, mechanics, geology, mathematics and architecture. Gates has called Leonardo Da Vinci "one of the most innovative minds ever." and a personal inspiration.

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