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We asked some of the boldest thinkers what the world will be like in 50 years. Here’s what their answers tell us about the future.

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AJ Jacobs

AJ Jacobs

Journalist and author

A.J. Jacobs is a writer, lecturer, and human guinea pig. He is the author of four New York Times bestselling books, including "The Year of Living Biblically" and "The Know-It-All." He is a contributor to NPR, the New York Times, and Esquire magazine and is a frequent TED speaker. His most recent book is "Thanks a Thousand."