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Aboard the International Space Station, Expedition 35 Flight Engineers Tom Marshburn and Chris Cassidy of NASA fielded questions from students at the Mary Marek Elementary School in Pearland, Texas, during an in-flight educational event April 8. Marshburn has been aboard the orbital laboratory since December 2012, and Cassidy arrived March 29. The two astronauts flew together as crewmates during the STS-127 mission of space shuttle Endeavour to the International Space Station in July 2009.