No Miracles Argument

The no miracles argument (also called the "success of science argument") is the central positive argument for scientific realism, most famously articulated by Hilary Putnam: "The positive argument for realism is that it is the only philosophy that does not make the success of science a miracle." The claim is that the extraordinary predictive and technological success of science is best explained by the approximate truth of its theories — specifically, by the fact that the theories' posited entities genuinely exist and causally interact with the world in the ways the theories describe.

The argument is an inference to the best explanation. Competitor explanations — that science succeeds because it is instrumentally useful, because it organizes experience, because it is socially constructed in ways that happen to work — are judged less parsimonious or less powerful than the realist explanation. If electrons did not exist, the argument runs, then the devices that manipulate them would not work; the existence of semiconductors and electron microscopes is itself evidence for electrons.

The argument faces well-known objections. Bas van Fraassen's "constructive empiricism" replies that science aims only at empirical adequacy, not truth, and that empirical adequacy is sufficient to explain success. The pessimistic meta-induction counters that past scientific success did not correlate with truth, so present success is not evidence for truth either. And underdetermination threatens the inference from success to truth by pointing out that multiple incompatible theories can be equally successful empirically.

The no miracles argument is not a deductive proof. It is a bet — a wager that the long-run correlation between theoretical success and ontological accuracy is not accidental.

_If the success of science is not a miracle, then the burden is on the anti-realist to explain why a sequence of falsehoods keeps producing working bridges, medicines, and microchips. Every competing explanation so far has been either a miracle in disguise or a confession of indifference._