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 moves without seeing and cries without eyes?
You need a key to receive an answer from me. The answer you'll find is straight from your mind. What is it?
You can tumble in it, roll in it, burn it, animal eat it. Used to cover floors, still used beyond stall doors. Freshens whatever it is placed on. Absorbs whatever is poured into it.
All about, but cannot be seen, Can be captured, cannot be held, No throat, but can be heard. Who am I?
What can never be put in a saucepan?