Answer:
When you put this in a heavy wooden box the box will become lighter
An archaeologist unearths a coin bearing the inscription "57BC". How does he instantly know that it's a forgery?
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?
How do you discover something that does not exist?
4 rubber ducks were floating in the bathtub, 2 floated away and 2 drowned. How many ducks are still alive?
The profession of Jimi Hendrix and Eric Clapton