Answer:
I go from house to house a messenger small and tight. Whether it rains or snows I sleep outside at night.
I work when I play and play when I work
I regularly change shape yet remain a sphere. I am always there but not often seen. What am I?
I am easy to waste. I am unstoppable. What am I?
I must be broken before you can use me.
What is lighter than what it is made of?