Instruct: Classify the given Amazon review into positive or negative sentiment.
Query: van fraassen's endorsement of unobservable entities

bas van fraassen in claiming to offer a viable alternativve to scientific realism has indirectly acknowledged the existence of unobservable entities in saying that we will nnot know eveything there is to know or everything thaat can be known in the universe/life.As an empiricist or form of it he generously engages the dicourse that unobservable entities DO have meaning but that they cant exist because any such admission would be a saving of realist theory(scientific realism posits the view that these objects have not only existence but meaning too).scientific realism is optimistic in that it belives that everything can be known or discovered by advocating this view of science,but vF rejcts this but by doing so he has created an entity that will remain forever unknowable to the mind,an unobsevable entity technically if nothing else he creates their existence and this is contrary to his position. paul neilan an NUIG student.