Neptunium and Plutonium

[Walter Russell] pioneered in foreseeing two of the greatest discoveries of modern times the isotopes of hydrogen, which led to the discovery of heavy water, and the two new elements used in the atomic bomb. He announced the complexity of hydrogen to a body of distinguished scientists years before the truth of his statement was verified. But it is the atomic bomb that will prove to be the earth-shaking, epoch-making discovery of the future. The two newly discovered elements which formed the basis of the atomic bomb, called Neptunium and Plutonium, were published in his charts of the elements in 1926. He named them Uridium and Urium. He also predicted that if ever discovered the pressures of this planet would not be sufficient to hold them together.
It is almost humorous to speak guarding the secret, locking it up in American and British archives, was his comment. Knowledge cannot be locked up. It is cosmic and wide open to every thinker, and limited only to his knowledge. And there is enough new knowledge right in this country today to make this present value of atomic secrecy worthless in a very few years.

(Glenn Clark: The Man Who Tapped the Secrets of the Universe)