On August 29, 1831, Michael Faraday wrapped two insulated coils of wire around an iron ring and connected one to a battery. When he completed the circuit, a transient current registered on a galvanometer attached to the secondary coil. In that quiet laboratory moment, Faraday discovered electromagnetic induction—the fundamental physical principle that dynamic magnetic fields generate electric currents.
Without this single insight, the modern technological stack could not exist. Faraday’s experiment birthed both the electric generator and the transformer, converting electricity from a quirky laboratory curiosity into the planet's primary utility. Every spinning turbine in a modern power grid, every step-down transformer feeding a data center, and every wireless charging pad on our desks traces its lineage directly back to Faraday’s iron ring. It was the precise inflection point where humanity learned to manufacture power on demand.