Trailer for Netflix documentary on Bill Gates reveals his worst fear

The three-part series Inside Bill's Brain: Decoding Bill Gates is helmed by the director of An Inconvenient Truth.

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A new Netflix documentary is going where no man has gone before: inside the complicated brain of Microsoft co-founder Bill Gates . Inside Bill's Brain: Decoding Bill Gates is a three-part documentary that will come to the streaming service on Sept. 20.

The series will focus on Gates' post-Microsoft life as philanthropist, global problem solver, and co-founder of the Bill & Melinda Gates Foundation. Gates tweeted the trailer on Tuesday. "I hope you enjoy what they've put together," he wrote. 

The series is directed by Davis Guggenheim, who won an Oscar for the 2007 documentary An Inconvenient Truth

"Davis had the idea of making a documentary that looked at the big projects I take on that are risky and might not happen otherwise, and that was interesting to me," Gates told Entertainment Weekly. "I hope this documentary leaves people optimistic that big problems can be tackled."

In the trailer, Gates is asked to name his worst fear. "I don't want my brain to stop working," he says. In the trailer, others share thoughts on just how his brain works. 

According to an official Netflix description, "Inside Bill's Brain draws on interviews with Bill and Melinda Gates in addition to their friends, family, and partners in philanthropy and business, creating an innovative and revealing portrait of a man who, after changing the world, might just change the way others see it." 

Originally published Aug. 20. 
Update, Aug. 29, 10:10 a.m. PT: Adds trailer for series.