Answer:
What can you stick between a 3 and a 4 so that the result is more than three but less than four?
An archaeologist unearths a coin bearing the inscription "57BC". How does he instantly know that it's a forgery?
What goes up the hill and down the hill, And spite of all, yet stand still?
I have two coins, one is marked George I and one is marked George IV. One is genuine but one is a forgery. Which is the forgery?
You are participating in the swimming finals at the Olympics. In the final few seconds of the race you narrowly pass the swimmer who was in third place. What place did you get?
By Moon or by Sun, I shall be found. Yet I am undone, if there's no light around