====== Glasses ======

Glasses are amorphous (non-crystalline) solid materials - most commonly silicates. The nature of the //glass transition// between a fluid or regular solid and a glassy phase is poorly understood.

According to (the late) [[https://en.wikipedia.org/wiki/Philip_W._Anderson|Professor Philip Warren Anderson :]]

>The deepest and most interesting unsolved problem in solid state theory is probably the theory of the nature of glass and the glass transition."\\ \\ Source : [[https://www.science.org/doi/10.1126/science.267.5204.1617.c|Through the glass lightly]] //Science//,17 March 1995.

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Also see: [[http://en.wikipedia.org/wiki/Glass|Glass]]  at //Wikipedia//.

//Note:// Glasses do //not// normally 'flow' at ambient temperatures. The much cited fact that ancient glass windows are often thicker at the bottom is explained because glaziers fitted them that way - heavy-end downwards.