Answer:
It's usually found dried, but often kept slicker. Above another need, it's said to be thicker. What is it?
By Moon or by Sun, I shall be found. Yet I am undone, if there's no light around
Describes universities like Harvard and can be poisonous.
Two bodies have I, though both joined in one. The more still I stand, the quicker I run.
My first is in fish but no in snail. My second is in rabbit but no in tail. My third is in up but not in down. My fourth is in tiara but not in crown. My fifth is in tree you plainly see. My whole a food for you and me.
You use it between your head and your toes, the more it works the thinner it grows.