Answer:
How do you discover something that does not exist?
In 1990, a person is 15 years old. In 1995 that same person is 10 years old. How is this possible?
An archaeologist unearths a coin bearing the inscription "57BC". How does he instantly know that it's a forgery?
If a rooster lays an egg on the exact peak of a barn, which side does it fall?
Which bank is not used for storing money?
By Moon or by Sun, I shall be found. Yet I am undone, if there's no light around
Logic
Animal
Difficult
Easy
Food
Funny
Kids
What am I?