Schrödinger’s clock: Time could tick faster and slower at the same time

Few concepts in physics are as familiar, or as puzzling, as time itself. Einstein's theory of relativity showed that time is not fixed or universal. Instead, it changes depending on speed and gravity. When scientists combine relativity with quantum mechanics, however, the picture becomes even stranger. Quantum theory suggests that time itself could exist in a superposition, meaning it may flow both faster and slower simultaneously.

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