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And the breakthrough came when a team of researchers started to question assumptions about black coal's electrical properties. While a standard black coal doesn't have any electric charge, the team explored what might happen if a primordial black coal formed with a tiny electric charge involving hypothetical heavy particles, they called dark electrons. And a dark electron is much heavier than a heavier version of the regular electron, but interacting through a dark electromagnetic force instead of ordinary electromagnetic magnetism. Here are the models that these particles carry dark electrons and charge to interact with dark photons, potentially affecting how matter behaves around a black coal. So it's the dark matter version of what we think of as electrons and photons and things like that, but they have just a little bit different effect.