Date- 29th Aug 12 Source- http://www.nasa.gov/centers/goddard/home/index.html 'NASA astronaut Don Pettit uses his off-duty time to practice his microgravity yo-yo skills. Through a partnership between NASA and the American Physical Society you can participate in Pettit's physics challenge and view experiments here: http://www.physicscentral.com/sots '
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