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In 1905, Einstein told the surprising story of how light can be both a particle and a wave through the special theory of relativity. Inspired by this, later scholars discovered that not only light but also general matter has wave properties, and that everything that exists in this world can be both a particle and a wave. However, there was one problem. If that were the case, we could not accurately predict the movement of very small matter, and we could only know its location through probability. And the discipline that studies this is quantum mechanics.