Answer:
What surrounds the world, yet dwells within a thimble?
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?
I always run but never walk, I sometimes sing but cannot talk, No head on which a hat to place, You always look me in the face.
Come up and let us go. Go down and here we stay.
If you have it, you want to share it. If you share it, you don't have it.
People take me on walks and I run and have fun. What am I?