Question: A woman was reading in the basement when her husband, thinking the basement was empty, turned off the light. The woman continued reading. There were no lamps or flashlights and the light her husband turned off didn't come back on. How was the woman able to read?
Answer: The woman was blind and was reading Braille.
Question: A semi truck weighing exactly 10,000 pounds gets onto a bridge that is 100 miles long. The bridge's weight limit is exactly 10,000 pounds, any more will break the bridge. After going about 80 miles down the bridge a small bird lands on the truck.
Answer: Nothing, after traveling 80 miles the truck will have surely burnt enough fuel to allow the bird to land on the truck without breaking the bridge.