Using China's colossal Five-hundred-meter Aperture Spherical radio Telescope (FAST),  a research team led by astronomers from the Purple Mountain Observatory (PMO) of the Chinese Academy of Sciences (CAS), has uncovered compelling new evidence supporting a binary-system origin for at least some fast radio bursts (FRBs). This dramatic, rapid, and reversible change in the magnetic environment marks the first time such a record has been obtained in FRB research.