Originally Posted by GSWayne
If glass flowed it would be impossible to make accurate optics and things like telescopes and camera lenses would quickly become useless. Good optics are precise to almost atomic dimensions and will hold that precision for years.
quote from sister at nasa
''Glass is technically a liquid. However the time to flow so you could see it is very long. Early glass makers did not have the float glass system and so making flat glass was tricky. It was naturally uneven. It would be natural to put the thick part at the bottom.
Glass does not have long range order,I.e. the atoms are not arranged regularly to make a crystal structure.''
well that explains that urban legend