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. There is a vacuum in every box.
I wonder how old these things are. Thousands of years?
Yeah, they all come from a very ancient time.
Hey, look at the tripod. I've seen it on TV.
It was made 4, 000 years ago. It's priceless!