Il Palazzo Enciclopedico: A visitor puzzles over the multitude of choices offered by the the 55th International Art Exhibition of La Biennale di Venezia. It runs from June 1 to November 24, 2013. Marco Secchi/Getty Images hide caption

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

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William Thomson Kelvin (1824 - 1907) who proposed the absolute or Kelvin temperature scale. He also established the second law of thermo-dynamics. He was brilliant. But he wasn't perfect. W. & D. Downey/Getty Images hide caption

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U.S. Navy sailors form a ceremonial guard at a wreath-laying ceremony to memorialize the victims of the attack on Pearl Harbor and pay tribute to the veterans of World War II in front of the Lone Sailor statue at the Naval Memorial in Washington, D.C., in December 2003. Brendan Smialowski/Getty Images hide caption

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