Answer:
When one does not know what it is, then it is something; but when one knows what it is, then it is nothing.
From tree to tree it jumps and it swings and this furry little fella likes fruits, nuts and seeds. And sometimes people say to “stop ‘us’-ing around.
What speeds on a track but isn't in a race and has a whistle to announce its steady pace?
What divides by uniting and by dividing?
Never swallowed but certainly chewed, tossed in the mouth but it is not food. What is it?
I’m grown from darkness but shine with a pale light. Very round I am and always a lady's delight.