by Paul Braterman
Science, it is often said, is restricted in principle to the search for natural causes. Is this a fundamental rule for doing science? Or merely a useful procedural guide, derived from experience? Is it even true? Or meaningful? Does it matter? These questions are addressed in an important series of papers in 2010, 2012, and 2014, by Maarten Boudry at the University of Ghent and his colleagues. They conclude that it matters a great deal, that the alleged restriction does not in fact exist, and that appealing to such a principle in argument is harmful to the cause of science. I agree.
I will deal with the first four questions in reverse order. Can we make a meaningful distinction between the natural and the supernatural? I was initially inclined to say no. If something occurs, it's part of nature. It is a law of nature that water doesn't turn into wine, but if you believe that the miracle of the wedding feast of Cana really happened, then you need to modify the law to say “Water doesn't turn into wine, except when Jesus tells it to.” Maarten persuaded me that this was not a helpful line to take. Like all attempts to define a problem out of existence, it is logically unassailable, but useless. It denies us access to the very distinction that we should be clarifying.
The question, however, is more difficult than it seems. After all, we do not know everything that there is to be known about nature. We readily apply the label “supernatural” to purported phenomena such as telekinesis or telepathy, in which mind is regarded as operating on matteror on other minds without material agency, but we do not have a satisfactory account of mind-matter relationships anyway. Other prime candidates for supernatural status, such as precognition and remote viewing, would if real involve transcending the usual space-time framework, but space and time are much less rigidly defined now than they seemed to be before Einstein. The limits of natural explanation have been extended in the past, by invoking action at a distance (gravity, then other forces), intrinsic randomness (quantum mechanics), and more recently particle entanglement (quantum mechanics again). Presumably they will be in the future, in ways yet undreamt of. So the fact that something cannot be explained by today's science need not force us to invoke the supernatural. What would, then? Boudry and Taner Edis suggest a test for what they call unphysical causation, but it is highly technical, with their criterion based on demonstrated access to uncomputable numbers (I will not attempt to reproduce their argument). However, they suggest some examples. What, for instance, if Lourdes started producing undeniable miracles in large numbers, including the regrowth of amputated limbs, but only for devout Catholics? What if all organisms were found to contain an identical section of DNA, whose diffraction pattern spelt out the message “© Yahweh 4004 BC”? What, I might add, if we really did start receiving messages from the dead?
