Marvel thinks they invented the ultimate crossover? Please. Physics assembled the original superhero team back when most people still traveled by horse. This legendary 1927 Solvay Conference photo is basically the Avengers of quantum mechanics—except instead of saving the universe, these folks were busy figuring out how it actually works. Einstein, Bohr, Schrödinger, Heisenberg, Curie... more intellectual firepower in one room than in all of Tony Stark's labs combined. And unlike Marvel characters, these geniuses actually existed and revolutionized our understanding of reality without a single CGI effect. Their equations still work even when the movie budget runs out.