>"At the molecular level, glass looks like a liquid." [...] >"Glass is formed by cooling certain liquids. But why the molecules in the liquid slow down so dra

>"At the molecular level, glass looks like a liquid." [...] >"Glass is formed by cooling certain liquids. But why the molecules in the liquid slow down so dramatically at a certain temperature, with no obvious corresponding change in their structural arrangement — a phenomenon known as the glass transition — is a major open question."