This Idea Must Die focused solely on cognitive science, but we would do well to question ourselves, our ideas, and generally to practice a bit of intellectual humility. In five, 50, or 150 years what notions will be considered horribly out of date? Maybe our labelling of mental illnesses will bite the dust? Perhaps our obsession with fossil fuels will shuffle off this mortal coil? It’s difficult, if not impossible, to say definitively which modern ideas should die. But that is no reason not to try.