May , is this the Hall of Ancient China ?   Yes . Look at these historical relics here , amazing !   Why are they all in glass boxes ?   For protection . Some relics will turn to dust if exposed to air .   So there isn't air in the glass boxes ?   No , there isn't . They are all vacuumed .   I wonder how old these things are , thousands of years ?   Yeah , they all come from a very ancient time .   Hey , look at the three-leg cup . I've seen it on TV .   The bronze cup was made 4,000 years ago . It's priceless !   Yeah , it has no value at all . Who will use this cup today ?   Danny , priceless means so valuable that you can't put a price on it .   Oh , it does ? 