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3M hosted a national competition for middle school ccientists. During the Chain Reaction Challenge, the finalists were divided into teams to design, construct and test a machine that completes a series of tasks within three minutes. Their machines must transport a marble that completes a series of energy conversions and activates a mousetrap to signal the end of their reaction.
Aaron Lavinsky is a staff photographer for the Star Tribune covering news, sports and everything in between. He joined the visuals staff in 2014.
aaron.lavinsky@startribune.com612-875- 0431