Amesbury: Dr. Will Bartolini and his wife, Kathleen, and a handful of students sway quickly about demonstrating how water molecules would if they were heated, instead of chilled, at the Cashman School in Amesbury on Wednesday morning. The chemist, whose son, Joe, is a second-grader there, did a science presentation teaching about the different states of matter: solid, liquid and gas. Bryan Eaton/Staff Photo

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