Why am I taller? : what happens to an astronaut's body in space

If youve seen astronauts returning to Earth youll have noticed that they have difficulty standing up because their muscles and bones have weakened. They also have problems with their vision, their sense of smell, and the bottoms of their feet. What happens in space that causes the human body to react and change? In 'Why Am I Taller?', Dave Williams, astronaut, aquanaut, pilot, ER doctor, scientist, CEO, and bestselling author, discusses what happ...