This coin is a great example for how unique the shape of a coin can be. After all, it was inspired by a special topic: the space-time continuum. Whoever associates space-time continuum with Einstein is correct, because space-time is related to the theory of relativity. It is a four dimensional structure that joins space and time, and takes into account the speed of the light. Even Aristotle explored the concept of space-time. The general theory of relativity later ...
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