Answer:
It holds most knowledge that has ever been said. But is not the brain, is not the head. To feathers and their masters, it's both bane and boonย One empty, and one full.
If I have it, I don't share it. If I share it, I don't have it. What is it?
I climb higher when hot, But beware my rage, Iโll kill with a breath, If I can escape my cage
What has one eye but cannot see?
I am round as a bowl, deep as a tub, but all the world's water couldn't fill me up.
Brings the sky a lot closer.