At the frontier where humanity's two great maps of reality — quantum mechanics and general relativity — have long refused to meet, a new instrument has quietly forced an introduction. Researchers have demonstrated the Quantum Galileo Interferometer, a device that watches atoms fall through gravity while existing in quantum superposition, and observed precisely the phase shift that theory had long promised but never proven. This is not merely a confirmation of an equation; it is the moment experimental physics learned to speak the language of the universe's deepest boundary.