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Exercise and Bone Tissue
![NASA Shuttle Astronaut](../../../../../../../../../figures.boundless-cdn.com/5161/full/designed-coke-beverage-can.jpeg)
NASA Shuttle Astronaut
Astronauts who spend a long time in space will often return to earth with weaker bones, since gravity hasn't been exerting a load. Their bodies have reabsorbed much of the mineral that was previously in their bones.
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