Answer:
If I have it, I don't share it. If I share it, I don't have it. What is it?
Runs smoother than any rhyme, loves to fall but cannot climb.
In marble halls as white as milk, lined with a skin as soft as silk. Within a fountain crystal-clear. A golden apple doth appear. No doors there are to this stronghold, yet thieves break in and steal the gold.
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?
Two in a whole and four in a pair. And six in a trio you see. And eight's a quartet but what you must get. Is the name that fits just one of me?
What never gets any wetter no matter how hard it rains?