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A NASA employee gives a demonstration at the 'Earth Day in the Nation's Capital' event on Thursday. NASA honors the day with an activity-packed event meant to engage public in science. (Julia Brouillette / The Washington Times)

A NASA employee gives a demonstration at the 'Earth Day in the Nation's Capital' event on Thursday. NASA honors the day with an activity-packed event meant to engage public in science. (Julia Brouillette / The Washington Times)

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