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Bright As A New Penny Science Experiment | Abakcus

Chemical Reactions! How to Turn a Penny Green Experiment

Science Project with Soda and Penny | Corrosiveness of Soda Project

Science Fair 2005 Penny Project Bren 016 | OnlyCherie | Flickr

Shiny Penny Science Inspired by Benny's Pennies - Creative Little

Science Experiment: How to Clean Pennies - Teach Beside Me