Fine Structure

Glass is a Mystery

All those old windows that had glass bulges at the bottom aren't actually from very, very slowly flowing glass, just from glass that started off imperfectly flat. Huh.

The rest of the article deals with how little we know about how glass forms. It's very interesting, even if not as interesting as shattering an explanation I always thought I had for bulgy glass.
http://www.nytimes.com/2008/07/29/science/29glass.html

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