The double-slit experiment is one of the most bizarre experiments in modern physics, and cuts to the heart of the weirdness of quantum mechanics.

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The double-slit experiment was designed to investigate whether light is a wave or a particle. It is one of the most famous and weirdest experiments in physics.

Now, a new double-slit–style experiment, reported online May 3 in Science Advances, has confirmed the wavelike nature of the electron’s antimatter counterpart: the positron.

The classic “double-slit” experiment reveals the strange duality of the quantum world, but it may behave more strangely than we thought – and could challenge one of the most closely held ...