I understand that glass is actually a liquid. How long would it take, on average, to see a noticible thickening in the bottom portion of a pane of glass?
Quick answer: You will never see any effects of flowing glass in your lifetime. Probably you wouldn’t even see much in the lifetime of the universe. For more info, so a search. This has been covered in abundance, both on the board and by Cecil himself.
Cecil:
How come you can see through glass?
What’s equus eroticus all about? Plus: is glass a liquid or a solid?
Cecil’s underpaid minions:
Why won’t two pieces of glass slide against one another?
The Teeming Millions:
glass is liquid, david is wrong
glass vs. crystal
And I think there was at least one more, but it appears to have been archived and lost in the UBB ==> vBB migration.