Answer:
What can you keep after giving it to someone?
The little pink nub that helps rectify mistakes.
What stays in one corner but travels around the world?
Mouth up it gets filled, mouth down it gets empty.
I never was but am always to be, and everyone looks forward to me
I am the fountain from which no one can drink. For many I am considered a necessary link. Like gold to all I am sought for, but my continued death brings wealth for all to want more.