Information, as the 5th state of matter:

https://phys.org/news/2022-03-state-universe.html

So it sounds like they are saying dark matter could be just old emails?

@sonhouse

https://aip.scitation.org/doi/10.1063/1.5123794

I put it here since it seems somehow to belong.

A phycisist named Vopson from Portsmouth claims that there is an experiment to establish if infromation has mass. If it had it would be a form of matter.

@Ponderable
The only problem I see with that is light can have information and light has no mass, so now what?