United States endurance swimmer Diana Nyad, right, with one of her shark divers, Niko Gazzace, as she celebrated her record-setting swim from Cuba to Florida, Tuesday, Sept. 3, 2013. She speaks March 11 at the Harris Center in Folsom.
United States endurance swimmer Diana Nyad, right, with one of her shark divers, Niko Gazzace, as she celebrated her record-setting swim from Cuba to Florida, Tuesday, Sept. 3, 2013. She speaks March 11 at the Harris Center in Folsom. J Pat Carter AP
United States endurance swimmer Diana Nyad, right, with one of her shark divers, Niko Gazzace, as she celebrated her record-setting swim from Cuba to Florida, Tuesday, Sept. 3, 2013. She speaks March 11 at the Harris Center in Folsom. J Pat Carter AP

What does it take to swim 110 miles at age 64? A high pain tolerance, for starters

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