Answer:
There are two sisters: one gives birth to the other and she, in turn, gives birth to the first. Who are the two sisters?
4 rubber ducks were floating in the bathtub, 2 floated away and 2 drowned. How many ducks are still alive?
A man goes upstairs to grab his time machine. He walks downstairs then goes back in time 200 years. Why did he go downstairs?
What can you fill a room with that takes up no space?
No is to negative as yes is to...?
I stand in one place yet fill the whole room. I can be filled with molten rock and come in every hue. What am I?