For 147 years, Edwin Hall's 1879 discovery stood as settled law: a magnetic field must be perpendicular to an electric current for the Hall effect to emerge. Researchers have now demonstrated that the effect occurs sideways as well — with the magnetic field running parallel to the current — dismantling an assumption so deeply embedded in physics that it shaped textbooks, instruments, and entire technologies across generations. The discovery is less a correction than a reminder that even the most load-bearing pillars of scientific understanding are provisional, and that nature has always been u