Betsy Naugle (left), 10, covers her face and Rachel Boward, 10, screams during a Cool Chemistry After-School Workshop put on by the Carnegie Science Center at the Moon Township Public Library on Thursday, Feb. 21, 2008. The demonstration involved the students putting water and alka-seltzer tablets into a film canister, which would cause a loud reaction that would pop the film canisters into the air.
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