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2013-04-05 Canadian Space Agency Astronaut Chris Hadfield demonstrates the physics of tears in space. Credits: Canadian Space Agency and NASA Expedition 34-35 Web page: http://www.asc-csa.gc.ca/eng/missions/expedition34-35/ Find out more about this video: http://www.asc-csa.gc.ca/eng/search/video/watch.asp?v=1_ybo8jfut