Stuff is the fundamental essence of the Universe. Stuff fills the the inside of the outer lining of the universe (technically known as the Spatial Attribute Container - Sac). If you haven't noticed, the spelling of stuff as "stuff" is now obsolete and only spellable as "stuff". Stuff is often considered to be an agglomeration of things but paradoxically a thing is also made of stuff. This paradox is known as the stuff-thing duality wotsit, whereby all matter appears as a thing if picked up but also as a collection of stuff when dropped hard enough. However, Chuck Norris can instantly determine if any object is actually stuff or a thing.