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Published June 09, 2013, 12:00 AM

Sulekha Osman and Nayeli Dominguez

Sulekha Osman, right, holds up a vial of vinegar that she and Nayeli Dominguez, left, and other students in their fourth-grade class at Pillsbury Elementary used May 31 to test rocks for the presence of the mineral calcite in Minneapolis. Associated Press
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