The moment of inertia of an object is a property that describes how difficult it is to rotate the object about an axis. Rotational inertia accounts for the stability of gyroscopes and bike-riders, and has applications for navigation of planes and figure skaters performing lightning-fast spins. Richard Garriott experiments with spinning a deck of playing cards to demonstrate both stable rotation and tumbling rotation.
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2013-03-31 - Canadian astronaut and Commander of Expedition 35 answers a question about how astronauts brush their teeth in space. You might be surprised by what he reveals!

Credits: Canadian Space Agency and NASA

Expedition 34-35 Web page: http://www.asc-csa.gc.ca/eng/missions/expedition34-35/

Hygiene in space Web page: http://www.asc-csa.gc.ca/eng/astronauts/living-hygiene.asp

Find out more about this video: http://www.asc-csa.gc.ca/eng/search/video/watch.asp?v=1_40lih8na
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