Answer:
What is the center of gravity?
What hangs in the sky by day but at night goes away?
The part of the bird, that is not in the sky, Which can swim in the ocean and always stay dry. What is it?
Retired people want these to be large and birds want them to hatch.
Old people and owls are said to be this.
I am a room that has a roof but no walls. What am I?