Here’s a question I’d like to see discussed: Can there be a theory of everything? I don’t just mean it in the physicist’s sense, where it concerns unifying quantum theory and relativity. I mean a single theory of the physical world, the biological world, the psychological world, and whatever other worlds you might think exist (mathematical, ethical, esthetic, social, and so on). Could all these domains be brought under a unitary empirical theory? The idea sounds very dubious to me. But why exactly?