Physicists at the University of Vienna created the largest quantum superposition ever recorded — a cluster of about 7,000 sodium atoms that existed in multiple locations simultaneously before interfering to create a detectable pattern. This experiment pushes the boundary of how large objects can be and still exhibit quantum behavior, challenging the unresolved question of where exactly the quantum-to-classical transition occurs. The result supports the idea that quantum mechanics applies at scales far larger than previously demonstrated, though physicists still disagree on what this reveals about the nature of reality itself.