Esquire magazine editor A.J. Jacobs is on a quest to become the smartest guy in the world -- by reading the entire Encyclopaedia Britannica. He's up to the letter "O." NPR's Linda Wertheimer checks on Jacobs' progress.
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As NPR's senior national correspondent, Linda Wertheimer travels the country and the globe for NPR News, bringing her unique insights and wealth of experience to bear on the day's top news stories.