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As cities define our world in new ways every day, Penn Institute for Urban Research asked nearly dozen urban experts, “Why cities?”

Penn IUR's Eugenie Birch, Richard Voith and Susan Wachter ask: Can rapidly urbanizing cities in low and moderate income countries become "smarter"?

An analysis of how flooding, the most frequent and costliest natural disaster in the U.S., will cause stress to the housing market in coming decades.

A chapter by Jeremy Nowak, who passed away this summer, adapted from the book "Shared Prosperity in America’s Communities."

Elijah Anderson writes that a spate of highly publicized recent incidents has highlighted the frequent racial targeting that blacks face as they live, work, study and otherwise navigate “white spaces.”