 It may also be that there is no internal unity to metaphysics. More strongly, perhaps there is no such thing as metaphysics—or at least nothing that deserves to be called a science or a study or a discipline.  Perhaps, as some philosophers have proposed, no metaphysical statement or theory is either true or false. Or perhaps, as others have proposed, metaphysical theories have truth-values, but it is impossible to find out what they are. At least since the time of Hume, there have been philosophers who have proposed that metaphysics is “impossible”—either because its questions are meaningless or because they are impossible to answer. The remainder of this entry will be a discussion of some recent arguments for the impossibility of metaphysics.