FYI, glass doesn't flow. That's a common myth. Modern glass making techniques are much better than older ones, and we can make flat glass panes of constant th

FYI, glass doesn't flow. That's a common myth. Modern glass making techniques are much better than older ones, and we can make flat glass panes of constant thickness. Those old screwy panes were just as screwy when they were first put in; that's as good as they could mass produce at the time. https://engineering.mit.edu/engage/ask-an-engineer/how-does-glass-change-over-time/ https://engineering.mit.edu/engage/ask-an-engineer/how-does-...