Could you explain the scientific reason as to why its a liquid? i have heard this before somewhere aswell to be honest with you but it clearly isnt
Im only TPFT so no windscreen cover unfortunately
How much scientific detail do you want? Basically it shares properties of both liquids and solids, and the correct term for it is 'amorphous solid'. This means that structurally it has properties similar that to of a liquid, but that they react to the impactic of force with elastic deformation (they break).
As for the antique window pane sotry, well thats due to the manufacturing process of glass at the time, not due to being an amorphous solid.