Steven Weinberg came up with a good idea one day while driving his red Camaro. The paper he wrote, “A Model of Leptons,” was just two and a half pages long—including references and acknowledgments. When it came out in 1967, it was largely ignored. But it became one of the most quoted physics papers ever and helped to earn Weinberg the 1979 Nobel Prize, shared with Abdus Salam and Sheldon Glashow.