Answer:
You use it between your head and your toes, the more it works the thinner it grows.
One day a little boy named John went over to his parents and said that he wanted to shoot people and blow them up. His parents were really proud of his career choice. What does John want to do?
Lighter than what I am made of, More of me is hidden Than is seen.
What has a bottom right at the top?
What is it which builds things up? Lays mountains low? Dries up lakes, and makes things grow? Cares not a whim about your passing? And is like few other things, because it is everlasting?
I can only be played on a windy day