Finally, if metaphysical explanation is deductive-nomological (or “covering law”), it seems that there is no room for explanations of rare or one-off phenomena in terms of the mechanisms that ground (or cause) them, even in cases where, had a similar mechanism occurred, it need not have given rise to a similar phenomenon (e.g., Taylor 2016). According to Trogdon (2018; see also Anscombe 1971), it seems likely that some explanations are one-off in this sense, from which it would seem to follow th