"If in reality eka-osmium possesses the same properties as uranium-235, it will be possible to extract it from the "uranium boiler" and use it as a material for an "eka-osmium" bomb. The bomb will therefore be made from an "unearthly" material, which has vanished from our planet."
January 1, 1970
https://en.wikiquote.org/wiki/Igor_Kurchatov