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Sultan Kosen, left, of Turkey, who according to the Guinness World Record Association is the world's tallest man, jokes with a student during a visit to the Cesareo Fernandez school in Havana, Cuba, Monday, March 14, 2011. Kosen, 28, is part of a group of young people visiting Cuba with Cuba Amore Foundation, a solidarity organization. (AP Photo/Javier Galeano)

Sultan Kosen, left, of Turkey, who according to the Guinness World Record Association is the world's tallest man, jokes with a student during a visit to the Cesareo Fernandez school in Havana, Cuba, Monday, March 14, 2011. Kosen, 28, is part of a group of young people visiting Cuba with Cuba Amore Foundation, a solidarity organization.

World's tallest man may have stopped growing

Thanks to treatment by researchers at the University of Virginia Medical Center, the world's tallest man, 29-year-old Sultan Kosen of Turkey, may have reached his peak at 8-feet-3 inches.