and normally they don’t interact

But dark energy and dark matter make up 95% of our universe. So they would be the “normal”.

If anything, the 5% that we do know would be the “abnormal”.

And anyway, it’s only called dark energy and dark matter, not because it doesn’t have a cause, but because it doesn’t interact with light (photons don’t interact with it).

Although I think you are right that they don’t know what causes it. It does interact with gravity, though.

But all this is way beyond my tiny brain.

Only the vampire bats. And they only live in Central and South America. Although bats do carry diseases.

Nearly half (44 percent) of the identified microplastics were fibers, while a third (30 percent) were plastic fragments. This is in tune with other studies that have shown plastic fibers from clothes and other textile products are the most prevalent form of microplastic in the environment.

More important than single-use plastics seems to be synthetic clothing.