Answer:
I am round as a bowl, deep as a tub, but all the world's water couldn't fill me up.
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.
Though not a plant, has leaves. Though not a beast, has spine. Though many wouldn't need this thing, It's more valuable than wine.
I'm a type of pizza that is folded in half before cooking to contain a filling
What moves without seeing and cries without eyes?
How can you add eight 6s together so that the total adds up to 750?
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?