A new quantum paradox throws the foundations of observed reality into question

If a tree falls in a forest and no one is there to hear it, does it make a sound? Perhaps not, some say.

And if someone is there to hear it? If you think that means it obviously did make a sound, you might need to revise that opinion.

We have found a new paradox in quantum mechanics—one of our two most fundamental scientific theories, together with Einstein’s theory of relativity—that throws doubt on some common-sense ideas about physical reality.

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