[api]

I’ve always understood photons as being “stuff” in it’s all energy no mass state.

What is “stuff” as all matter no energy?

[BizarroLand]

Probably any matter at absolute 0 would qualify? I think otherwise all mass has some excess of energy in it, I could be wrong.

Alternatively, possibly dark matter would qualify, although I am not sure either as we haven't even proven that it exists.

[BizarroLand]

Wait, no, I was wrong. Matter and Energy are the same thing. Only nothing has no energy or matter.