See larger Science teacher John Kappotis shows a container of liquid nitrogen during a demonstration for second-graders at Seacrest Country Day School on Tuesday, Oct. 20, 2009, in Naples. David Albers/ Staff

Photo by DAVID ALBERS

Science teacher John Kappotis shows a container of liquid nitrogen during a demonstration for second-graders at Seacrest Country Day School on Tuesday, Oct. 20, 2009, in Naples. David Albers/ Staff

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