WowSphere on Instagram: "Tesla's Columbus Egg proved magnetic fields can generate motion. Nikola Tesla's famous 1893 demo at the World's Columbian Exposition used a copper egg placed inside a rotating magnetic field created by two coils. The egg spun on its end like a top-no mechanical contact, no strings, just pure electromagnetic induction making it rotate smoothly and stand upright. It was the first public demonstration of a rotating magnetic field, the core principle behind every AC inductio