ALLEGRA BOVERMAN/Staff photo. Gloucester Daily Times. Gloucester: From front to back are Madison Dempsey, 10, Cameron Dempsey, 8, and Kaci Orlando, 7, making lava lamps using water, vegetable oil, Alka Seltzer and food coloring during the monthly science workshop held at the Sawyer Free Library on Tuesday. They were learning about the density of objects and liquids.

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