What will keep your brownies warm the longest?

That was the question recently posed to a group of fifth-grade science students at the Barnstable Horace Mann Charter School on Cape Cod, Massachusetts. The students, along with teacher Sarah McCormack, were taking part in an experiment to find out which type of household container--ranging from Tupperware to a Ziploc bag--would do the best job in preserving the temperature of a just-baked brownie.

While comparing the insulating properties of food storage materials might sound like a job for professional scientists,...

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