Such an approach often allows historical scientists to pick out a piece of evidence (from some combination of effects) for which there is only one known (or theoretically plausible) cause, thus making it possible to establish a past cause decisively. Though this strategy involves looking at a wider class of facts than the first strategy, the logical status of the inferences involved is the same. In each case, the presence of a fact (either standing on its own or in combination with other facts) for which only one cause is known allows historical scientists to make a definitive inference about
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