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It is one of the all-time greatest physics experiments: such a classic that it's taken a century to go one better.

In the double-slit experiment of 1908, a photon fired at a pair of slits passed through both simultaneously and interfered with itself. This surprising effect provided one of the first clues to the weird world of quantum mechanics.

Now precise measurements have been made on a version with three slits – and they again confirm the predictions of quantum mechanics.

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Category: Science