Answer:
A blind man enters a maze, and the entrance closes behind him. His only way out is to solve the maze. A long time passes, and he exits the maze through the correct exit. How did he solve the maze?
What gets wetter as it dries?
Iron on a mammal. Mammal on your feet.
Power enough to smash ships and crush roofs. Yet it still must fear the sun.
A circle of stones, never in rows. Stacked one on the other, mystery it sows. What is it?
You use it between your head and your toes, the more it works the thinner it grows.