Borosilicate glass, a type of glass with the main glass forming constituents silica and boron oxide
It meant nothing.
A glass ceiling in an organisation is an unofficially bar to the promotion of certain types of staff, normally women. It is called glass because its not obviously there, but it is in fact. A glass...
possibly a spirit, paranormal entity.
NO.it just makes you feel smart but that dosent mean you are......(: