A topic is neither semantically nor epistemologically strongly defined. While accepted by many, some educators have criticized constructivism both epistemologically and pedagogically. Behaviorism proposed epistemologically limiting psychological study to overt behavior, since that could be reliably measured. Epistemologically, Yoga school accepts three means to reliable knowledge, while Advaita Vedanta accepts six ways. Epistemologically, idealism manifests as a skepticism about the possibility of knowing any mind-independent thing. Chip Morningstar holds a view critical of deconstruction, believing it to be "epistemologically challenged". Gentile defined Fascism as an anti-intellectual doctrine, epistemologically based on faith rather than reason. The common-sense theory about physical objects is epistemologically comparable to the gods of Homer. His approach to issues is almost nonexistent epistemologically. Epistemologically, it is not impossible to tell whether we are living in a simulation.