Einstein’s doubts were only heightened when in 1927 Heisenberg published his paper on the central role of uncertainty in the quantum world. What he meant was that it is impossible to determine at any given moment both an entity’s precise position and its precise momentum: “We cannot know, as a matter of principle, the present in all its details.” Born agreed, and argued that the outcome of any quantum experiment depended on chance. In 1927, Einstein wrote Born: “An inner voice tells me that this is not the true Jacob. The theory accomplishes a lot, but it does not bring us closer to the
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