 It should be noted, however, that it is not the case that only mental properties can explain and be explained by the occurrence of mental properties. That would lead to an “outlet” problem, with mental properties being explanatorily insulated from physical properties—something inconsistent with the way in which we ordinarily think of mental-physical interaction. A blow to the head can, for instance, explain the occurrence of a thought. And a thought can explain the movement of an object, as when my decision to quench my thirst leads to the movement of a glass of water to my lips. However, the blow cannot rationalize the thought, and the decision cannot rationalize the movement of the glass (though it can rationalize the action of moving the glass). Davidson’s dual explananda strategy provides no account of such phenomena (for discussion of the outlet problem, see Gibbons 2006). Nonetheless, so long as there are occurrences of mental properties in need of the distinctive kind of explanation provided by rationalization, mental properties occupy an ineliminable explanatory role. And given Anomalous Monism, that role is irreducible. It is worth noting that this dual explananda strategy is consistent with Davidson’s commitment to the causal closure of the physical domain (Crane 1995 seems to miss this point)—every physical event can have a physical explanation, even if the mental component of some physical events can be rationally explained only through appeal to mental components of the causing event. Therefore, however causal closure ultimately enters into Anomalous Monism (see the supplement on  Causal Closure of the Physical and Anomalous Monism),  it does not appear to create any further problems for Anomalous Monism’s ability to account for the ineliminable, irreducible explanatory role of mental properties.