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The article seems to promote the myth that glass flows slowly over time ... https://io9.gizmodo.com/the-glass-is-a-liquid-myth-has-final....

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I didn't read it that way. It sounds like it discussing the transition from liquid to glass and the way that the molecules slow down during that transition.

I was in a cellar once with some really old wine and the necks of the bottles were drooping down the way. Any idea why that might be?

I have seen that. I suspect it's from production. If so, why do people orient the droops downwards, becomes the question.

The other orientation is much less stable; it’s a stationary point but if nudged will rotate away from droop-up.

Similar reason old pre-float-glass windows are mostly found thick side down; easier to fit that way because they’re more stable. The myth that they flowed over time is just that. :-)

And they're less likely to leak in rain when installed that way.

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