Famous last words....

“In essence, the conflict that exists today is no more than an old-style struggle for power, once again presented to mankind in semireligious trappings. The difference is that, this time, the development of atomic power has imbued the struggle with a ghostly character; for both parties know and admit that, should the quarrel deteriorate into actual war, mankind is doomed.

Despite this knowledge, statesmen in responsible positions on both sides continue to employ the well-known technique of seeking to intimidate and demoralize the opponent by marshaling superior military strength. They do so even though such a policy entails the risk of war and doom.

Not one statesman in a position of responsibility has dared to pursue the only course that holds out any promise of peace, the course of supranational security, since for a statesman to follow such a course would be tantamount to political suicide. Political passions, once they have been fanned into flame, exact their victims…“

The phrase refers to one of the most important theories in modern physics: quantum mechanics. It describes the weird behavior of tiny subatomic particles. A major part of quantum theory, called the Heisenberg Uncertainly Principle, says it's impossible to know both the speed and position of a single particle at the same time. So in quantum mechanics nothing can be certain, and we can only describe things in terms of probabilities.