A single antimatter particle in a cage opens door to 'revolutionary' physics Physicists trap and cool down positron for months to measure its 'magnetic moment' with extraordinary precision. By Elizabeth Gibney

https://www.nature.com/articles/d41586-026-03342-2 Physicists have now suspended a single positron — the antimatter equivalent of an electron — in mid-air and cooled it to its lowest possible energy state. The set-up will enable researchers to study magnetic properties of the positron with unprecedented precision. Physicist hope to spot subtle differences between matter and antimatter that could shed light on one of physics’ greatest mysteries.