Carnegie Lake, Australia, 1999 Carnegie Lake in Western Australia fills with water only during periods of significant rainfall. In dry years, it is reduced to a muddy marsh. Flooded areas appear dark blue or black, vegetation appears in shades of dark and light green, and sands, soils and minerals appear in a variety of colors. NASA hide caption

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Part four delves into the world of people who live in 24-hour Internet cafes because they can't afford rent. Courtesy of Shiho Fukada/Panos Pictures hide caption

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President Obama delivers his State of the Union address last year. On Tuesday night, he will be back at the Capitol for another address to a joint session of Congress. Getty Images hide caption

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Rudi Kistler and Maurus Oehmann, Mannheim 2012 Courtesy of Francois Brunelle hide caption

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The Picture Show

Have We Met Before? Doppelgangers Caught On Camera

For the past several years, Francois Brunelle has been photographing people who happen to look strikingly similar but aren't related.

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