Answer:
What goes through a door but never goes in and never comes out?
Big as a saucepan, deep as a cup, Even a river can't fill it up. What is it
There is an ancient invention still used in some parts of the world today that allows people to see through walls. What is it?
What gets colder as it warms up?
We are two brothers on opposite sides of the road, but we never see each other. Who are we?
It is something you will never see again.