Kevin Faulconer reaches for his wife, Katherine, at a Feb. 11 rally as their daughter looks up from below. Faulconer, a Republican, won the San Diego mayoral race last week. Lenny Ignelzi/AP hide caption

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Sadia Bies and Boston Mayor Thomas Menino stand next to her portrait of him at a July press conference. Menino, the city's longest-serving mayor, is stepping down at the end of his term. Aynsley Floyd/Invision for Gillette hide caption

itoggle caption Aynsley Floyd/Invision for Gillette

Political theorist and author Benjamin R. Barber (left) spoke at the CityLab summit this week in New York. He is proposing the formation of a "World Parliament of Mayors." Courtesy of The Atlantic hide caption

itoggle caption Courtesy of The Atlantic

World War Z is just the latest pop-culture incarnation of the Zombie Apocalypse. Adam Frank says the zombies keep coming because they're trying to tell us something. MPC/Paramount Pictures hide caption

itoggle caption MPC/Paramount Pictures

Information, like light, flows through cities in interesting, often beautiful, patterns. Valery Hache/AFP/Getty Images hide caption

itoggle caption Valery Hache/AFP/Getty Images