Mark Keli
Mark Keli is a former NASA astronaut and the identical twin brother of Skot Keli. He served as a control subject during Skot's year-long mission in space, providing valuable insights into the physiological and genetic changes that occur in astronauts due to extended exposure to microgravity.
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Serbia:
Mark Keli is a former NASA astronaut and the identical twin brother of Skot Keli.
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