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 boonΒ One empty, and one full.
What goes around and around the wood, but never goes into the wood?
What gets wetter as it dries?
Hold the tail, while I fish for you.
Dies half its life. Lives the rest. Dances without music. Breathes without breath.
What is so fragile that saying its name breaks it?