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Exercise in chamber that simulates gravity may prevent stone formation As the space shuttle Discovery prepares to launch on July 1, researchers at the University of Minnesota have identified a way for astronauts to reduce their risk of developing kidney stones while in space. Astronauts lose calcium in their bones and strength in their muscles while in space because of the zero-gravity environment. This calcium can end up in their kidneys, putting them at risk for developing kidney stones....
- The navel or umbilicus.
- In Greek archaeology: A central boss, as on a shield, a bowl, etc.