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Whether we electrons, light quanta, benzol molecules, or stones, we shall always come up against these two characteristics, the corpuscular and the undular.

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
Always
Characteristics
Physics
Stones
Shall
Whether
Quanta
Two
Electrons
Light
Molecules
Come
Quantum

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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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Not only is the Universe stranger than we think, it is stranger than we can think.
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What we observe is not nature itself, but nature exposed to our method of questioning.
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The basic idea is to shove all fundamental difficulties onto the neutron and to do quantum mechanics in the nucleus.
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It seems sensible to discard all hope of observing hitherto unobservable quantities, such as the position and period of the electron... Instead it seems more reasonable to try to establish a theoretical quantum mechanics, analogous to classical mechanics, but in which only relations between observable quantities occur.
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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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Every tool carries with it the spirit by which it has been created.
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The one who insists on never uttering an error must remain silent.
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Science clears the fields on which technology can build.
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In general, scientific progress calls for no more than the absorption and elaboration of new ideas- and this is a call most scientists are happy to heed.
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Can quantum mechanics represent the fact that an electron finds itself approximately in a given place and that it moves approximately with a given velocity, and can we make these approximations so close that they do not cause experimental difficulties?
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It was about three o'clock at night when the final result of the calculation [which gave birth to quantum mechanics] lay before me ... At first I was deeply shaken ... I was so excited that I could not think of sleep. So I left the house ... and awaited the sunrise on top of a rock.
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The world thus appears as a complicated tissue of events, in which connections of different kinds alternate or overlap or combine and thereby determine the texture of the whole.
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The more precise the measurement of position, the more imprecise the measurement of momentum, and vice versa.
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By getting to smaller and smaller units, we do not come to fundamental or indivisible units. But we do come to a point where further division has no meaning.
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Where no guiding ideals are left to point the way, the scale of values disappears and with it the meaning of our deeds and sufferings, and at the end can lie only negation and despair. Religion is therefore the foundation of ethics, and ethics the presupposition of life.
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A consistent pursuit of classical physics forces a transformation in the very heart of that physics.
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Many people will tell you that an expert is someone who knows a great deal about the subject. To this I would object that one can never know much about any subject. I would much prefer the following definition: an expert is someone who knows some of the worst mistakes that can be made in the subject, and how to avoid them.
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Natural science, does not simply describe and explain nature it is part of the interplay between nature and ourselves
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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.
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