Answer:
If you have me, you want to tell me. If you tell me, you don't have me.
Deep, deep, do they go. Spreading out as they go. Never needing any air. They are sometimes as fine as hair
The part of the bird, that is not in the sky, Which can swim in the ocean and always stay dry. What is it?
Rotten trees and Jack-O-Lanterns have this characteristic in common.
What is the center of gravity?
People take me on walks and I run and have fun. What am I?