The ultimate test is it needs to contribute actually. It's about the unification of science, I guess. We now understand chemistry in terms of predominantly electromagnetism. And that is all by way of exemplifying why it's not true that metaphysics is this other thing compared to science. Not everybody's scientific practice. Lots of scientists don't have to care about these issues at all. But every now and again, they're really crucial. Some scientists think about them a lot and don't separate thinking about them from being scientists.

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