See larger Seven-year-old Matthew Schaller watches a balloon expand as the gases inside expand after being exposed to liquid nitrogen during a demonstration for elementary students at Seacrest Country Day School on Tuesday, Oct. 20, 2009, in Naples. David Albers/ Staff

Photo by DAVID ALBERS

Seven-year-old Matthew Schaller watches a balloon expand as the gases inside expand after being exposed to liquid nitrogen during a demonstration for elementary students at Seacrest Country Day School on Tuesday, Oct. 20, 2009, in Naples. David Albers/ Staff

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