What NASA learned by sending a 77-year-old astronaut into space

When you have the opportunity to take gravity away from the human body, the results are pretty fasninating.

Space may be the final frontier, but it's really interesting what it does to our bodies. Scientists are studying the effects of space on the body, says former astronaut and current physician Scott Parazynski. The results are pretty fascinating, especially when you have the opportunity to take gravity out of the equation. Scott Parazynski is the author of The Sky Below: A True Story of Summits, Space, and Speed.