Photo exhibit shows captured moments from streets of New York [audio 3min]

The streets of New York -- with their clamor, hustle and snap -- are captured in an exhibition of photographs in Washington, D.C. At the National Gallery of Art, black-and-white pictures by Walker Evans, Robert Frank, Helen Levitt and others, taken from 1938 through 1958, show a raw, edgy city. ~Website offers extended report by Susan Stamberg and audio slideshow.