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An astronaut on the ISS is worried about having grown 9cm since arriving (update 1/10/18: he actually grew only 2cm: http://www.bbc.co.uk/news/world-asia-42630473 ); most astronauts grow (temporarily) 2-5 cm in space due to their spines expanding in zero-g: http://www.bbc.com/news/world-asia-42618786 (On Earth you may be 1/2" taller when you get up in the morning than when you went to bed!)

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