Answer:
When will water stop running down hill?
We traveled the sea far and wide. At one time, two of my sailors were standing on opposite sides of the ship. One was looking west and the other one east. And at the same time, they could see each other clearly. How can that be possible?
What is at the end of a rainbow?
Why is 6 afraid of 7?
What is broken if you say its name?
I am a room that has a roof but no walls. What am I?