  The great asset of Cornell realism is that it directly adopts widely accepted views about the nature of natural properties and scientific knowledge in order to answer the foundational questions of moral metaphysics and moral epistemology. What are moral properties? Highly complex natural properties, individuated by their causal profiles—Boyd calls these homeostatic cluster properties. Are there, generally, properties like this? Yes; healthiness is one; moral properties are properties like that. How do we know about moral properties? By looking for directly observable properties that are characteristically functionally upstream or downstream from the moral property that we are interested in (provided that we have justified background beliefs about the functional roles of moral properties). Do we, generally, have knowledge like this? Yes; this is how we have scientific knowledge; moral knowledge is knowledge like that. In this way, the theoretical resources of scientific realism also turn out to support moral realism (Boyd 1988).