I really enjoyed this article and experiment probably because it spanned so much time. After reading the article on glass too I wondered it scientists had ever viewed the atomic structure of the pitch. Is it random (erg liquid) or is it ordered (ergo Solid). If the former we have the slow dripping of a very solid liquid. If the latter we have the even more interesting proposition of a slightly liquid solid.

Not to dispute the other posts but according to the end of the article on glass researchers said it would not drip since the bonds overpowered any liquid traits at room temperature. The statement about the castles is very interesting (I believe I have heard it before) and I believe true especially since throughout summers castle's windows are rarely at "room temperature" but actually quite a bit hotter. I wonder how much it would cost to get a 1000 year warranty on my monitor to replace it when it drips.

One final question, which is faster dripping pitch or M$ activity to really tighten security? Trick question, dripping pitch actually exists.

Anyway thanks for an interesting post.