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Bill Gates, founder of Microsoft Corp., left, talks with his father Bill Gates Sr., during an event at the 92nd Street Y in New York, U.S., on Wednesday, June 2, 2010. They discussed the elder Gates' new book "Showing Up for Life: Thoughts on the Gifts of a Lifetime." Photographer: Jeremy Bales/Bloomberg via Getty Images

Bill Gates, founder of Microsoft Corp., left, talks with his father Bill Gates Sr., during an event at the 92nd Street Y in New York, U.S., on Wednesday, June 2, 2010. They discussed the elder Gates' new book "Showing Up for Life: Thoughts on the Gifts of a Lifetime." Photographer: Jeremy Bales/Bloomberg via Getty Images