6 of 11: Ribbons of water flow off a mock-up waterfall designed for the National September 11 Memorial & Museum, Friday, Jan. 22, 2010 at the Brooklyn Navy Yard in New York. The 30-foot waterfall will cascade down the sides of the footprints of the destroyed World Trade Center towers, forming reflecting pools surrounded by the terrorist attack victims' names. (AP Photo/Mark Lennihan) (AP Photo/ Mark Lennihan)

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