Answer:
What kind of room has no doors or windows?
Material for making balls and men that only shows up at certain times of the year.
Shorter than my four siblings, but easily the strongest, Sometimes I wear a funny hat.
Fred and Wilma's child, named after a stone.
When one does not know what it is, then it is somethingอพ but when one knows what it is, then it is nothing.
What is always coming but never arrives?