Originally Posted by Revvy
That was my first thought....but doesn't glass get more and more brittle with age?
Originally Posted by 7Enigma
No need to claim, just go look at an old church's stained glass windows. Notice how they are much thicker at the bottom than the top. This is due to the glass "flowing" down over many MANY years.
Actually, that's a myth. The thickness variation in historical glass was an artifact of the manufacturing process, not due to room-temperature flow. The RT flow rate of glass is sufficiently slow that you can essentially assume it doesn't flow at all.
Ask yourself this question: If 300 year-old glass is so much thicker at the bottom, why aren't Egyptian glass artifacts (3,000 years+) puddles yet?
Here are a few links for reference: