Astronaut-climber: 'I'm not a risk taker'

He's summited Mount Everest. He's walked in space seven times.

Dr. Scott Parazynski (yes, he's an M.D., too) has seen the planet from heights most people only dream of. Now he's back on the ground lending his expertise to earthly research on relatively tiny scales as chief medical officer and chief technology officer for The Methodist Hospital Research Institute in Houston.

He shares his thoughts on the last shuttle launch and the future of space program.

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