Pauli's December 1930 letter proposed the particle to rescue energy conservation in beta decay; Reines and Cowan detected it in 1956. The prize ledger: 1988 for the muon neutrino, 1995 to Reines for the detection itself, 2002 to Davis and Koshiba for cosmic neutrinos, 2015 to Kajita and McDonald for oscillations, and 2026 to Halzen for the astrophysical ones. Five Nobels, one ghost.
Pauli reportedly called it a terrible thing, postulating a particle that could not be detected. Every part of the apology failed: it was detected, it turned out to carry the secrets of supernovae and black holes, and its detectability problem became the reason for the largest instruments on Earth. The impossible-to-see particle became the reason we can see otherwise invisible things.
The Nobel's own popular text puts the flux at 65 billion neutrinos through a fingernail each second, and notes they pass through Earth and our bodies unremarked. That shyness is the feature: neutrinos are the only messengers that leave extreme cosmic engines without being absorbed, bent, or dimmed. The universe's most violent places are only honestly reported by the particle that refuses to interact.
A particle proposed to balance an equation ended up opening a window on the cosmos; how much of physics is bookkeeping that turned out to be landscape?