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Artificial intelligence, we\u2019ve been told, will destroy humankind. No, wait \u2014 it will usher in a new age of human flourishing! Guest host Adam Davidson (co-founder of "Planet Money") sorts through the big claims about A.I.'s future by exploring its past and present \u2014 and whether it has a sense of humor. (Part 1 of "How to Think About A.I.")