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Byline: April Bethea
Oct. 4--Twenty pairs of eyes watched closely as Stephen Bell carefully dropped bits of the chemical into the small bottle.
The right mix, and the concoction would turn blue. That would help tell Samantha Mazzone's seventh-grade class at Cochrane Middle School how much dissolved oxygen was in the water sample from Briar Creek.
Only that afternoon, things weren't quite working for Bell, a sophomore at Queens University of Charlotte.
It was a small glitch in a two-week experiment on water-quality testing led by Queens professor Reed Perkins and students in the school's environmental science department.
The middle…