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I believe that the existence of the classical path can be pregnantly formulated as follows: The path comes into existence only when we observe it.

Werner Heisenberg

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Werner Heisenberg
Age: 74 †
Born: 1901
Born: December 5
Died: 1976
Died: February 1
Academic
Mathematician
Mountaineer
Non-Fiction Writer
Nuclear Physicist
Physicist
Theoretical Physicist
University Teacher
Kreisfreie Stadt Würzburg
Werner Karl Heisenberg
Heisenberg
Werner K. Heisenberg
Observe
Follows
Path
Existence
Comes
Believe
Formulated
Classical

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Uncertainty is NOT I don't know. It is I can't know. I am uncertain does not mean I could be certain.
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The more closely you look at one thing, the less closely can you see something else.
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The structure underlying the phenomena is not given by material objects like the atoms of Democritus but by the form that determines the material objects. The Ideas are more fundamental than the objects.
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Unless you stake your life, life will not be won.
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Both matter and radiation possess a remarkable duality of character, as they sometimes exhibit the properties of waves, at other times those of particles. Now it is obvious that a thing cannot be a form of wave motion and composed of particles at the same time - the two concepts are too different
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It will never be possible by pure reason to arrive at some absolute truth.
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The conception of objective reality ... has thus evaporated ... into the transparent clarity of mathematics that represents no longer the behavior of particles but rather our knowledge of this behavior.
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An expert is someone who knows some of the worst mistakes that can be made in his subject and how to avoid them.
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Every word or concept, clear as it may seem to be, has only a limited range of applicability.
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The violent reaction on the recent development of modern physics can only be understood when one realises that here the foundations of physics have started moving and that this motion has caused the feeling that the ground would be cut from science
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What we observe is not nature itself, but nature exposed to our method of questioning.
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The discontinuous 'reduction of the wave packets' which cannot be derived from Schroedinger's equation is ... a consequence of the transition from the possible to the actual.
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A consistent pursuit of classical physics forces a transformation in the very heart of that physics.
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Nonsense. Space is blue and birds fly through it.
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Quantum theory provides us with a striking illustration of the fact that we can fully understand a connection though we can only speak of it in images and parables.
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