Finding mysterious positron sources in the Milky Way (Image: Gerhard Hüdepohl/ESO)From New Scientist:
Atoms called positronium inexplicably scatter off gas particles as if they were lone electrons, even though they contain an anti-electron as well. The finding hints that engineers could use the well-known scattering properties of electrons as a rule of thumb in designing future medical scanners that employ positronium. It could also help interpret puzzling astronomical observations.
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