Marvel thinks they invented the ultimate crossover? Please. Physics had the original superhero team-up in 1927 at the Fifth Solvay Conference, where Einstein, Bohr, Curie, Heisenberg, Schrödinger, and other titans of quantum mechanics gathered to fundamentally reshape our understanding of reality. These folks weren't fighting Thanos—they were battling the very nature of existence itself. And unlike Marvel, their equations actually make sense.