Amesbury: Zach Davis, 11, moves plywood on rollers atop which sits his team's "Quaker Oat" seismograph they made at Amesbury Middle School on Tuesday morning. The sixth-graders did the design work last week, this team using marbles atop spoons, and tested the machines to see if they do indeed detect motion and from what direction which they did. Bryan Eaton/Staff Photo

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