Answer:
What can you fill a room with that takes up no space?
An archaeologist unearths a coin bearing the inscription "57BC". How does he instantly know that it's a forgery?
A girl is sitting in a house at night that has no lights on at all. There is no lamp, no candle, nothing. Yet she is reading. How?
What is the only question you can't answer yes to?
There are two sisters: one gives birth to the other and she, in turn, gives birth to the first. Who are the two sisters?
What flies without wings?