Answer:
How do you discover something that does not exist?
What coin doubles in value when half is deducted?
How can you place a pencil on the floor so that no one can jump over it?
How is it possible to always find what your looking for in the last place you look?
How can you throw a ball 20 meters, and have it come back to you without hitting anything?
What did the piece of wood say when he saw the screwdriver and screws approaching?
Logic
Animal
Difficult
Easy
Food
Funny
Kids
What am I?