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No one in the world can fathom what quantum mechanics is, this is perhaps the most important thing you need to know about it. Granted, many physicists have learned to use its laws and even predict phenomena based on quantum calculations. But it is still unclear why the observer of an experiment determines behavior of the system and causes it to favor one state over another. “Theories and Applications” picked examples of experiments with outcomes which will inevitably be influenced by the observer, and tried to figure out how quantum mechanics is going to deal with the intervention of conscious thought in material reality.
Today there are many interpretations of quantum mechanics with the Copenhagen interpretation being perhaps the most famous to-date. In the 1920s, its general postulates were formulated by Niels Bohr and Werner Heisenberg. The wave function has become the core term of the Copenhagen interpretation, it is a mathematical function containing information about all possible states of a quantum system in which it exists simultaneously.
As stated by the Copenhagen interpretation, the state of the system and its position relative to other states can only be determined by an observation (the wave function is used only to help mathematically calculate the probability of the system being in one state or another). We can say that after observation, the quantum system becomes classical and immediately cease to exist in other states, except for the state it has been observed.