Cathode tube
From Jenny Everywhere Wiki
In one universe, cathode tubes, capable of projecting special rays, were kept in hospitals on Mars. One was mistakenly left running in the delivery room when Jane 6em35, the half-human half-Martian daughter of Jarl 6em35 and Jane Faro, was born; she was exposed to it by a careless nurse. This had no immediate effects but resulted in her developing nigh-magical abilities as she grew up, becoming the “Magician from Mars”. (COMIC: Magician From Mars…)