 These claims raise a number of issues that can be explored only briefly. First, let us distinguish between providing an ordinary scientific explanation for why some counterfactual claim is true and providing truth conditions (or identifying a truth maker) in the sense described above, where these truth conditions are specified in non-modal, non-counterfactual terms. The expectation that (i) whenever some macro-level interventionist counterfactual is true, there will be some more fundamental scientific explanation of why it is true seems plausible and well grounded in scientific practice. By contrast, the expectation that (ii) for every true counterfactual there must be a truth maker that can be characterized in non-modal, non-counterfactual terms is a metaphysical doctrine that requires some independent argument; it does not follow just from (i). Suppose that it is true that 