CONCEPT
The Decisive Experiment
Pasteur's signature methodology — experimental design so clean that only one explanation can account for the result, systematically eliminating alternatives until truth stands alone.
The decisive experiment is Pasteur's supreme instrument of persuasion — not because it produces facts (facts can be disputed) but because it produces experiments whose design admits only one explanation. Each alternative hypothesis is treated as a candidate, tested against evidence, confirmed or refuted by outcome. When all alternatives have been eliminated, the remaining explanation stands not as the most attractive theory but as the only theory compatible with the evidence. The design of decisive experiments — identifying the single variable that distinguishes competing explanations, constructing conditions that isolate it, anticipating ways the experiment might fail to distinguish what it was designed to distinguish — is the operational signature of the prepared mind. The swan-neck flask experiment, the controlled fermentation comparisons, the attenuated-vaccine trials: each exemplifies the methodology.
In The You On AI Field Guide
The decisive experiment is the antidote to plausibility. AI systems generate plausible explanations with extraordinary fluency. Plausibility is not truth. A plausible explanation is one compatible with the known evidence — but so is