Diana Nyad chases longtime Cuba-Florida dream swim

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U.S. swimmer Diana Nyad, bottom, begins her swim to Florida from the waters off Havana, Cuba, Saturday, Aug. 18, 2012. Endurance athlete Nyad launched another bid Saturday to set an open-water record by swimming from Havana to the Florida Keys without a protective shark cage. (AP Photo/Ramon Espinosa)Less than a week shy of her 63rd birthday, American endurance athlete Diana Nyad is trying for the third time in a year to become the first person to swim across the waters separating the U.S. from Cuba without using a shark cage.

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