In our cover story, Lee Cowan reports on the debate among North Dakotans about the true Geographical Center of North America. David Martin profiles Marine Cpl. Hershel "Woody" Williams, the last surviving Medal of Honor recipient from World War II. Faith Salie investigates the possibilities of time travel. Rita Braver sits down with former Senators Bob and Elizabeth Dole, and Tracy Smith interviews comedian and impressionist Rich Little

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