An Enlightening Riddle
Q. I weigh nothing, but you can still see me. If you put me in a bucket, I make the bucket lighter. What am I?
A. A hole!
Q. There is a house with four walls. All of the walls are facing south. A bear is circling the house. What color is the bear?
A. White. If all walls of the house are facing south, the house must be on the North Pole, so the bear is a polar bear.