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While I'm only kidding about energy not being conserved, I really don't
understand the mechanism which caused such a violent event to occur. My
chemist daughter tells me that Pyrex glass should be capable of going from a
warm oven into a freezer. She would heat quartz (not Pyrex) tubing up to
600 deg C and then thrust it into ice water. I was only trying to go from a
warm (not hot) burner to one at room temperature.