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Selena Bueno of Onigum uses a magnet to move a magnetic liquid around in a test tube Thursday while exploring the NanoDays exhibits at the Headwaters Science Center. Bemidji Pioneer

Students explore NanoDays at Headwaters Science Center

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Bethany Wesley

BEMIDJI — Avery Harper hunched over a glass beaker, closely examining a submerged nickel as it began to change color.

“You could see the edge of the nickel, it turned brown first,” the 17-year-old said afterward. “Then you could see the silver all over disappear.”

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