istara, in short, yes. In one of my chemical engineering courses, our professor gave us an article that explained that it would take longer than the current age of the universe for glass to flow that much. The window-makers probably just installed the panes so the thicker edge would be pointed down. Unfortunatly, we don’t have many “how to” books from that time period to confirm the practice.
sob Yes, and he should have his credentials revoked. Follow the link given earlier or search this forum to find this myth debunked many times.
Giraffe: I was trying to be good naturedly obnoxious, if that makes sense. Sorry to have appeared to get on your case. Please note that the T[sub]g[/sub] does give you a non-arbitrary point of reference for the phase change.
As for applications for superfluids: I used to work for a gas distributor. Every once in a while we would ship some liquid He in little canteen-sized cylinders to a local university (I think UCSD, but it’s been a while.) Anyway, the word was that it was used to verify absolutely leak-free vessels and tubing for nuclear/radioactive research. Since the He was a superfluid, any leak, however small, would be apparent as the liquid He could flow through holes of nearly atomic dimensions.
It was a while ago, so if any has a correction please chime in.