Answer:
There is an ancient invention. Still used in some parts of the world today. That allows people to see through walls.
What is the difference between a car and toilet paper?
What can fill up a room that takes up no space
What did one wall say to the other?
Tuesday's Riddle: What gets wetter and wetter the more it dries?
Thousands lay up gold within this house. But no man made it. Spears past counting guard this house, but no man wards it.