Comparing an atom to a coin is like comparing a human heart to a repeatedly clinching fist. The analogy is woefully simplistic in relation to what is actually going on. But someone with a layman's understanding of the human body is unlikely to grasp the nuances of the human heart. Similarly, someone whose understanding of physics is derived from high school science class is unlikely to grasp the quantum world. So despite its shortcomings, a coin may be an apt description. Or at least the most apt description this side of the Heisenberg Uncertainty Principle.
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