Originally Posted by
waterrockets
It's like the glass is a liquid argument. Tell that to the 10000-year-old obsidian arrow heads that you can shave with or Mt. Wilson observatory's perfect-figure optics from 108 years ago.
Still, old homes have thicker glass at the bottoms of their windows, so it must be because they're liquid, right?

I hate that glass argument. Glass is just an amorphous solid that has a second order transition at Tg instead of first order at Tm like crystalline solids. Even if you used kinetic models to describe the glass relaxation time (which is only valid if it is around or above Tg) then its on the order of the length of time of the universe.
/materials science rant