Well, I believe gamma rays didn't exist before the discovery in 1900. If you look at any science book written before 1900, there's
not one mention of gamma rays.
So that's proof that no such thing existed, at least up until 1900. Absence of proof is proof of absence. Hey, its the scientific method so its not wrong.
And with all that in mind, I can say with confidence that none of the things listed by the OP exist, and are scientifically impossible to exist. Exactly the way gamma rays were scientifically impossible to exist before 1900.
