Rita Levi-Montalcini, 1986

“Predictions of the unpredictable are encouraged by the same history of NGF”

Rita Levi-Montalcini looked back on thirty-five years of investigation in her Nobel lecture of December 8, 1986. The subject was nerve growth factor, abbreviated NGF, a biological signal central to her prizewinning research. Near the lecture’s conclusion, she described a history in which unexpected observations repeatedly redirected the inquiry. The selected words begin that longer reflection; they are an excerpt rather than a complete standalone sentence. Its deliberate paradox conveys the attraction of research whose future cannot be neatly forecast. Levi-Montalcini and Stanley Cohen jointly received the 1986 Nobel award in medicine for discovering growth factors. Looking backward from that recognition, she did not portray every stage as an inevitable march toward a known destination. Her account made room for surprise, collaboration and questions that became visible only after earlier questions had been pursued. The uncertainty was part of the work’s intellectual life.

Predicting the unpredictable does not mean abandoning disciplined observation. A surprise becomes useful when someone recognizes it, investigates it and distinguishes a meaningful finding from a misleading impression. Imagine a researcher expecting one pattern and noticing a result that does not fit. Discarding it immediately would protect the original expectation; treating it as a discovery immediately would be equally premature. The productive space lies between those responses, where the result can be examined more carefully. The imagined situation illustrates that outlook; it does not reconstruct any specific episode from her laboratory. The phrase also reminds readers that an important discovery may open more questions than it closes. Naming a biological signal does not by itself establish every effect it has, every condition in which it matters or every possible use. Research can become more consequential as it becomes more complicated, provided its claims remain accountable to evidence.

For a health audience, the distinction between an unexpected finding and an established treatment deserves special attention. Levi-Montalcini’s lecture discussed possible future applications as part of an unfolding scientific story. Possibility is an invitation to investigate, not a promise that a particular patient will benefit. Reading a historical lecture responsibly means preserving that difference and avoiding the temptation to turn its forward-looking passages into present medical advice. The enduring idea is broader than any one proposed application: progress can require curiosity about observations that a tidy plan did not anticipate. That curiosity gains value from careful methods and collaboration, not from confidence alone. Her sentence allows optimism without certainty. A reader can appreciate the potential of a discovery while asking what is known, what is still being tested and what additional work would be needed before hope becomes dependable care. The unknown then becomes a field for inquiry rather than an empty space to fill with promises.