Answer:
What surrounds the world, yet dwells within a thimble?
When you stop and look, you can always see me. If you try to touch, you cannot feel me. I cannot move, but as you near me, I will move away from you.
He has married many women but has never married.
Two people are born at the same moment, but they don't have the same birthdays. How could this be?
What turns from red to black as soon as it touches water?
What did the piece of wood say when he saw the screwdriver and screws approaching?