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 boon One empty, and one full.
What stays on the ground but never gets dirty?
Double my number, I'm less than a score. Half of my number is less than four. Add one to my double when bakers are near. Days of the week are still greater, I fear.
Blend a teapot shot so the pearlies won’t rot!
What is it that given one, you’ll have either two or none?
I have two eyes in the front and a lot of eyes on my tail