As part of the kick-off to a series this week on the PBS NewsHour examining the communities of Patchwork Nation, project director Dante Chinni takes viewers on a drive down Germantown Ave., revealing the many "cities" that make up Philadelphia.

During the last two decades of his life, Marcel Duchamp appeared to have given up art for chess, publically claiming he had gone underground. But hidden in his New York apartment was the final, enigmatic piece he had been working…

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