NASA astronaut Don Pettit used some of his off duty time while in space to teach kids about physics using a yo-yo. Although some people have been complaining about the fact that showing yo-yo tricks in space is not a proper use of tax payer dollars, I think it's fair to say that it is: because it was in his spare time, and doing experiments like this one is a great way to get people (especially young people) interested in NASA and science.
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