All Facts are Theories, But Not All Theories are Facts

Are theories and facts different in kind, or are they related and transform into each other?

During the interminable debates about "Intelligent Design" and evolution, there was much hand-wringing about fact vs theory. Evolution was, to some, "just" a theory, to others a well-attested theory, and to others, a fact, whether in the observation of life's change through time (vs the straight creationists), or in the causal mechanism of natural selection (vs the so-called intelligent design proponents). Are theories just speculations, or are they, once accepted by their relevant community, the rock-like edifice of science? And are facts even plain as such, or are they infected by theory? Our late descent into unhinged right-wingery poses related, though far more complex, questions about the nature of facts and who or what can warrant them. But here, I will stick to the classic question as posed in philosophy and science- what is the distinction and or relation between facts and theories? This follows, but disagrees with, a recent discussion in Free Inquiry.

The official scientific organs (NCSE) have generally taken the position that theories are different from facts, making a pedagogically bright line distinction where things like tectonic plate theory and evolution are theories, while rock compositions and biochemistry are facts. In this way, science is made up, at a high level, of theories, which constantly evolve and broaden in their scope, while the facts they are built on arrive on a conveyor belt of normal scientific progress, via lab experiments, field work, etc. Facts help to support or refute theories, which are such abstract, dynamic, and wide-ranging bags of concepts that they can not rightly be regarded as facts.

All very pat, but what are facts? It turns out that nothing we observe and call a fact escapes some amount of interpretation, or the need to be based on theories of how the world works. We grow up with certain axiomatic and built-in conditions, like gravity, vision, and physical cause and effect. Thus we think that anything we "observe" directly is a fact. But all such observations are built on a history of learning about how things work, which is in essence starting with a bunch of theories, some instinctively inborn, which are gradually satisfied by evidence as we grow up ... to the extent that we take many things for granted as fact, like being able to count on gravity as we are walking, that the sun comes up every day, etc. Facts are not automatic or self-attested, but rather are themselves essentially theories, however simple, that have been put to the test and found reliable.

And therein lies a clue to how we, and especially scientists, evaluate information and use the categories of fact and theory in a practical and dynamic way. Lawyers often talk of coming up with a theory of the case, which is to say, a story that is going to convince a jury, which has the job of finding the facts of the case. When the jury finds the theory convincing, and vote for the lawyer's side, the facts are found insofar and the law is concerned. Their determination may come far short of philosophic rigor, but the movement is typical- the movement from theory to fact. 

On the other hand, what is a theory? I think it can be described as a proposed fact. No one would propose a theory if they didn't think it was true and explanatory of reality. Whether broad or narrow, it is a set of interpretations that seek to make sense of the world in a way that we limited humans can categorize, into our store of knowledge. For instance, Freudian theories of repression, Oedipal complexes, castration fears, etc. would have been, if borne out, facts about our mental lives. Being rather vague, they may have needed a great deal of refinement before getting there, but all the same, they were proposed facts regarding what we feel and do, and the psychic mechanisms that lead to those feelings. 

In science, it is the experiment and its communication that is the key event in the alchemy of transforming theories into facts. Science is unusual in its explicit and purposeful interaction with theories that are unproven. Tectonic theory was once a mere theory, and a crackpot one at that. But as observations came in, which were proposed on the basis of that theory, or retroactively appreciated as support for it, such as the lengthy hunt for mid-ocean ridges where tectonic plates separate, and other faults where they converge, that theory gained "fact-ness". Now it is simply a fact, and the science of geology has gone other to other frontiers of theory, working to transform them into fact, or back off and try some others.

The mid-Atlantic ridge, straining to be understood by observers equipped with the theory of plate tectonics. Also, a video of the longer term.

Another example is the humble molecular biology experiment, such as cloning a gene responsible for some disease. The theory can be so simple as to be hardly enunciated- that disease X is in part genetic, and the responsible mutation must occur in some gene, and thus if we find it, we can establish a new fact about that disease as well as about that gene. Then the hunt goes on, the family lineages are traced, the genetic mapping happens, and the sequencing is done, and the gene is found. What was once a theory, if an unsurprising one, has now been transformed into a fact, one perhaps with practical, medical applications.

But the magic of experiments is usually only discernable to the few people who are sufficiently knowledgeable or interested to appreciate the transformation that just happened. The boundary between theory and fact depends on the expertise of the witnesses, and can be sociologically hazy. Does homeopathy cure disease? Well, hemeopathic practitioners regard that as fact, and have gone on to an elaborate practice and pharmacopeia of dilute solutions to effect various cures. Others disagree and regard the whole thing as not only a theory, but a stunningly wrong-headed one at that- as far as can be imagined from having gained fact-hood. Real science revolves around experiments done to what is essentially a standard of philosophical proof. Techniques are reported and consistently applied, controls are done to isolate variables of interest, materials are described and made publicly available, and the logic of the demonstration is clarified so that readers knowledgble in the arts of the field can be confident that the conclusions follow from the premises. And the practitioners themselves are culturally vetted through lengthy apprenticeships of training and critique. 

The practice of peer review is a natural part of this series of events, putting the experiment through a critique by the (hopefully) most knowledgeable practitioners in the field, who can stand in for the intended audience for whom the experiment is supposed to perform this alchemical transformation of theory. The scientific literature is full of the most varied and imaginative efforts to "factify" hypotheses, hunches, and theories. Very few of these will ever be appreciated by the lay public, but they lay the ever-advancing frontier of facts from which new hypotheses are made, new theories tested, and occasionally, some of their resulting facts are discovered to be useful, such as the advent of gene therapy via the Crisper/Cas9 gene editing system, liposomes, and associated technologies. 

Another aspect of the public nature of science and peer critique is that if a knowledgeable observer disagrees with the theory-fact transition purported by some experiment, they are duty-bound and encouraged to replicate those experiments themselves, or do other experiments to demonstrate their counter-vailing ideas. On a cheaper level, they are welcome and encouraged to ask uncomfortable questions during seminars and write tart letters to the editors of journals, since pointing out the errors of others is one of the most enjoyable activities humans pursue, and doubles as a core of the integrity that characterizes the culture of science. In this way, facts sometimes reverse course and travel back into the realm of theory, to sweat it out in the hands of some disgruntled grad student and her overbearing supervisor, destined to never again see the light of day.

Experiments crystallize most clearly the transition from theory to fact. They create, though careful construction, a situation that banishes incidental distractions, focuses attention on a particular phenomenon, and establishes a logic of causation that forms (hopefully) convincing evidence for a theory, transforming it into fact, for knowledgeable observers. They create controlled and monitored conditions where knowlegeable people can "see" the truth of a theory being put to a decisive test. Just as we can now see the truth of the heliocentric theory directly with the use of spaceships sent out across the solar system, the observation of a fact is a matter of the prepared mind meeting with a set of observations, either tailored specifically in the form of an experiment to test a theory, or else taken freely from nature to illuminate a theory's interpretation of reality. Nothing is intrisically obvious, but needs an educated observer to discern truth. Nothing is completely theory-free. Nevertheless, facts can be established.

• Lies are power.
• On social contagion.
• Code red.
• The electricity interconnect of the Eastern US slowly grapples with reality.
• How many has Covid killed?
• In Afghanistan, the US has spent decades building a political and military paper tiger.