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Jaret Williams and Sam Rivera from St. Mary's County, MD., work on a... Fotografía de noticiasCelebración,Día de la Tierra,EE.UU.,Estación de la Unión - Washington DC,Horizontal,Juegos de adivinanza,Medio ambiente,NASA,Política,Trabajar,Washington DC,Zona urbanaPhotographer Collection: CQ-Roll Call Group © 2013 CQ Roll CallUNITED STATES - APRIL 22: Jaret Williams, 13, and Sam Rivera, 13, from St. Mary's County, MD., work on a Earth puzzle at the NASA booth at an Earth Day 2013 celebration at Union Station. (Photo by Chris Maddaloni/CQ Roll Call)