A behavior predicted by the famous physicist Paul Dirac in 1931 has been shown in a system of ultracooled atoms in the lab. The system mimics a magnetic monopole, which has only one pole, passing through an electron.

Bizarre Magnetic Particle Revealed in Ultra-Cold Lab Experiment
Bizarre magnetic behavior that was predicted by a famous physicist more than 80 years ago has finally been demonstrated in the lab, according to a new study.
The behavior of an electron in response to a magnetic monopole, or a solitary magnet with just a north pole, has been demonstrated in an ultra-cold material that mimics a natural magnetic system. And the monopole and electron system behaves just as English physicist Paul Dirac predicted it would in 1931.
Though the new experiment, described t...
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