Answer:
There is an ancient invention still used in some parts of the world today that allows people to see through walls. What is it?
It is where kings, queens, knights and bishops go to war together.
A gentleman whose offspring have successfully produced offspring of their own.
There is a man in a 4 story building. He jumps out of the window and is unharmed. He used no padding, and had no harm done. How?
You row in one while you float.
What is yours but only used by others?