Solve the puzzles
- What is black when it's clean and white when it's dirty?
- What falls but never gets hurt?
- What doesn't ask questions but needs to be answered?
- What kind of dog has no tail?
- What travels around the world but always stays in the corner
- What has teeth but can't bite?
- What gets bigger without getting heavier?
- What goes through the door but never goes in or out?
- A blackboard
- A telephone
- A hotdog
- A stamp
- A comb
- A hole
- A keyhole