Fresh Air for September 13, 2010 Hear the Fresh Air program for September 13, 2010

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From WHYY in Philadelphia

Every year, as many as 1 billion colds are caught in the U.S., says science writer Jennifer Ackerman. iStockphoto.com hide caption

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iStockphoto.com

'Ah-Choo!' Takes On Mysteries Of The Common Cold

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In the 1920s, Harlem's African-American population exploded — with nearly 200,000 African Americans inhabiting a neighborhood where there had been virtually no blacks 15 years earlier. Above, a Harlem street in 1942. National Archives/Getty Images hide caption

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National Archives/Getty Images

Great Migration: The African-American Exodus North

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Fresh AirFresh Air

From WHYY in Philadelphia