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UNITED 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)

UNITED 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)

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