Answer:
When you put this in a heavy wooden box the box will become lighter
What is the difference between yesterday and tomorrow?
What starts with an E, ends with an E & only contains one letter but is not the letter E
An archaeologist unearths a coin bearing the inscription "57BC". How does he instantly know that it's a forgery?
What goes up and never comes down?
I met a man and drew his name. He tipped his hat and played my game. What is his name?