Did paleontologists discover dinosaurs or did they make them? Is it even conceivable that the past could depend on the present? I will argue, contra scientific realists, that for all we know the distant past could be socially constructed, but that there is also no good reason for thinking that it is socially constructed. Like the religious skeptic who admits that the stories of the Christian tradition might be true, but sees no good reason for thinking that they are true, I counsel agnosticism on the whole question of metaphysical realism vs. social constructivism. Someone who follows this policy will endorse neither the radical constructivist view of W. J. T. Mitchell, nor the realist metaphysics of Alan Musgrave.