Answer:
What kind of nut is empty at the center and has no shell.
I am the hole in the night, the ever watchful eye. I return in a cycle, to enlighten the sky.
I climb higher when hot, But beware my rage, I’ll kill with a breath, If I can escape my cage
I am a fire's best friend. When fat, my body fills with wind. When pushed to thin, through my nose I blow. Then you can watch the embers glow.
I can run but not walk. Wherever I go, thought follows close behind.
Almost everyone needs it, asks for it, gives it. But almost nobody takes it.