Before an observation is made, an object exists in all possible states simultaneously. To determine which state the object is in, we have to make an observation, which “collapses” the wave function, and the object goes into a definite state. The act of observation destroys the wave function, and the object now assumesa definite reality. Michio Kaku
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The process of observation is the moment when an object is determined to be in a certain state. Observation makes reality real. The act of observing collapses the wave function of an object, and this particle will now take on the definite state that it previously filled. This act of observation may seem like magic, but in quantum mechanics it is completely fundamental.

Source: Parallel Worlds: A Journey Through Creation, Higher Dimensions, And The Future Of The Cosmos

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