In his new book, How to Create a Mind, The Secret of Human Thought Revealed, Ray Kurzweil expounds on the biggest of big ideas.

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And in a forthcoming book, How to Create a Mind: The Secret of Human Thought Revealed, he offers the most advanced explanation to date for how our brains work.

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To listen to Mr. Kurzweil or read his several books (the latest: "How to Create a Mind") is to be flummoxed by a series of forecasts that hardly seem realizable in the next 40 years.

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