[Chickensoup]

Interesting trivia

The old glass of Notre Dame is thicker on the bottom than on the top because of the liquid properties of glass with the atoms moving so slowly...

[redgolum]

Glass is basically a really thick liquid.

So in a way, the windows are “bubbles”. In theory, left long enough, a window would break as the glass settles on the bottom of the pain.

[redshawk]

The old glass of Notre Dame is thicker on the bottom than on the top because of the liquid properties of glass with the atoms moving so slowly...

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That’s one thing that most folks know. They think of glass as a solid.