FILE - In this Oct. 3, 2014 photo, author Walter Isaacson poses before an interview at his home in New York. Isaacson's latest book, "Leonardo da Vinci," comes out Oct. 17. (AP Photo/Bebeto Matthews, File)
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FILE - In this Oct. 3, 2014 photo, author Walter Isaacson poses before an interview at his home in New York. Isaacson's latest book, "Leonardo da Vinci," comes out Oct. 17. (AP Photo/Bebeto Matthews, File)
