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Well, being a glassman, I have to say that that glass was doomed before you made that squeeling noise. The glass was not properly annnealed(cooled) and it had stress built up in it. The vibrations from the squeel, simply pushed it over the edge and forced the glass to relieve the stress. Kind of like the straw that broke the camel's back... Jake, if you have a pair of polarized glasses, take a peek at the stem with them on, you'll probably see lots of rainbows. Thats the glass molucules straining under the stress.
thats very cool though, and a nice goblet too.. Sorry for the loss.
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