We have often been told that old European cathedrals glazing
show glass is still moving in a semi-solid state as the stained
glass panels thicker at the bottom - right? Yes and no - but not
for the change in the thickness of the glass. Way back in 2008,
this NY Times Science article delved into the nature of glass -
"...The (cathedral stained glass) tale contains a grain of truth
about glass resembling a liquid, however. The arrangement of
atoms and molecules in glass is indistinguishable from that of a
liquid. But how can a liquid be as strikingly hard as glass?
“They’re the thickest and gooiest of liquids and the most
disordered and structureless of rigid solids,” said Peter
Harrowell, a professor of chemistry at the University of Sydney
in Australia, speaking of glasses, which can be formed from
different raw materials. “They sit right at this really profound
sort of puzzle.” "...scientists still disagree, with some
vehemence, about the nature of glass.""Scientists are slowly
accumulating more clues. A few