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Middle school students from Spring Ridge Middle School in St. Mary's... News PhotoCarbonated,Celebration,District,Earth Day,Horizontal,Junior High,NASA,Paper,Person in Education,Politics,Rocket,Science,Scientific Experiment,Sponsorship,Tourism,Tourist,USA,Union Station - Washington DC,United States Congress,Washington DCPhotographer Collection: CQ-Roll Call Group © 2012 CQ Roll CallUNITED STATES - APRIL 22: Middle school students from Spring Ridge Middle School in St. Mary's County, Md., conduct an experiment with a paper rocket and effervescent tablets in Union Station as part of an Earth Day celebration sponsored by NASA. (Photo By Tom Williams/CQ Roll Call)