 If one's goal, in constructing a theory of location, is to articulate the necessary and a priori truths governing location and its interaction with parthood, then even McDaniel's modest point still counts against including No Interpenetration in one's theory. For if McDaniel is right, then that principle is at best an a posteriori truth, though perhaps still a necessary truth. (See Simons (1994a, 2004a) for further discussion of bosons and for related considerations in support of interpenetration. For further discussion of Hawthorne and Uzquiano, see Cotnoir (2016).)