I will define the phrase "measured fact" to be something akin to instrument K measures datum D. ('datum' being the singular of 'data').
Particular examples of measured facts are the following:
- The planet Mars has 2 moons.
- A chemist heats two regents in a flask for a specific time, causing a reaction to create a third compound. The chemist examines the contents and notes the ratios of the compound to the remaining regents. The chemist types this number into a laptop.
- The African bureau takes a census and find that the population of Madagascar is 26 million people.
- The first character of this bullet point is a capital
T
, given by ASCII code 0x54 - Betty White is alive today.
Measured facts occur prior to any process of interpretation of a body of data. They occur far prior to the establishment of any predictive scientific theory. This author recognizes and respects the various philosophical problems and quandaries that arise during the interpretation of a collection of data. It is not the expressed nor hidden motivation of this author to force the reader into a narrow set of epistemic commitments, or to proselytize a particular ontology.
There is nothing within the disciplines of logic or philosophy in any tradition that allows a denial of a measured fact from the comfort of one's own leather armchair. The denial of a measurement is in fact not a viable technique under in any circumstances. As the actual act of denial involves building your own instrument and measuring your own data. Measurement denial is then often time consuming, logistically difficult and prohibitively expensive. Nevertheless, none of these economic and provincial hurdles act as a justification of denial. "I cannot afford to do that" is not an item of evidence for your position, no matter how truthful the plea may be.
In my personal experience, the only people who overtly deny measured facts are (1) evangelical christian creationists -- whose motivations are often unspoken but nevertheless transparent. (2) Used car salesman, whose motivations are entirely transparent. (3) Amateur philosophers who are abusing a distorted form of Cartesian solipsism. (4) Politicians and political pundits.
In my interactions with amateur philosophers on the internet, who contend disciplined philosophy permits measurement denial. In every single case that I have experienced, never once has the philosopher attempted to provide a summary defense of their denial on methodological or pragmatic terms. Nor have they given me a single concrete example where one would be forced to deny a measured fact for some expedient reason. Instead the conversation deteriorates into some sort of social game with no explicit end, other than either trolling or being abusive for fun.
The canon in the age of machines
For brevity, I will let the canon be a placeholder for four famous philosophers of the Western enlightenment, who are famous for their particular forms of skepticism. Rene Descartes, George Berkeley, David Hume, and Immanuel Kant. For our purposes here, the dates of their lives should be noted.
Rene Descartes (1596 -1650)
George Berkeley (1685 -1753)
David Hume (1711 -1776)
Immanuel Kant (1724 - 1804)
All four of these men could justifiably entertain positions that all facts are interpreted, since the only entities in agrarian Europe which could measure and sense the world were biological sense organs. In contrast, the 21st century is a world awash in machines that can measure the world without human intervention, encode those measurements into data, then store that data. Many of those machines, now called "computers", can then go on to process that data.
It is an important faculty developed by the study of philosophy, that the human mind is prone to failures of interpretation, and can be misled about the facts. Epistemic frameworks introduce problems. Overbearing Ontological commitments can mask and distort a person's interpretation of a fact. Religion can distort one's belief in facts, and alter the importance of measurements. Bias can lead a statistician astray. The desire to mislead others can cause problems with the collection and storage of facts in humans. Desire to cheat one's self can all play a factor in distortion of a single datum. This is all very true.
Well, all very true for human beings. Machines do not have religion. They do not have epistemologies. They are not programmed with a particular ontology, because they are not programmed with any ontology. Machines are not biased for racial or political reasons. Machines do not have extraneous motivations that cloud their judgement, because most machines have no motivations, full stop.
In the world we live in , (not the world of 18th century Europe) we have microphones that can measure sound at decibel levels. We have charge coupled devices that can record high frame rate color video. We have telescopes that can measure infrared light -- not even visible to the human eye -- and can store these measurements with the precision and accuracy of energy levels in nano-joules ; 1 billionth of a joule. It is because of these modern instruments that we know that the human ear does not hear loudness in its true linear form. But actually our sense of loudness is logarithmic. These sorts of differences between the human perception of a datum, versus a machine's measurement can allow us to refer to something called the "ground truth" of a measurement. Descartes, Hume, and Kant did not have this concept and it does not appear in their vocabulary.
It is because of these mindless machines which can sense, measure, encode and store facts, that we can do a particular technological act that was simply unavailable to Descartes, Hume, and Kant. We can corroborate our own human perceptions with the same measurement performed by a machine.
Lets return to the example I listed above, which is a chemist exposing regents in a flask to create a product compound. That entire process, including the measurement of the results could proceed by a machine. Furthermore, its software could convert the raw measurement from cameras into information in the form of encoded bits, and store those bits into a database.
I ask the reader now to imagine if a human then repeated the exact procedure using their hands and eyes. Say the human chemist then types in their measurement onto their laptop. Say their number happens to match exactly the number that the machine came up with. This is a concrete example that demonstrates, that under certain circumstances a human being CAN sense, measure, and record a fact about the world. In no shape or form am I asserting that human beings always and continually perceive facts about the world at all hours of their waking life. Instead, I only assert that there exist some rare situations in which a human is perfectly capable of sensing, measuring and recording facts.
Therefore, any amateur philosophers brandishing sophomoric solipsism, have been handed a concrete counter-example to their pleading assertion that "there are no facts, only interpretations".
It is very unlikely that traditional enlightenment skepticism can survive in a world of information processing machines. Today we can not only hypothesize that a signal contains a certain upper bound of information content, but we can quantify that information content in terms of Shannon Entropy. Information in this sense of a signal. Thermodynamics has exposed a maximum upper bound on information that could possibly be stored in a collection of matter, say a benzene molecule. As far as our best understanding of physics dictates, the size of information encode-able onto matter is upper-bounded. this upper bound is enforced by the laws of physics. So, there is some upper bound of information that could, in principle, be encoded in a benzene molecule.
Since our modern civilization has demonstrated an equivalence between the physical states of matter and amount of information encode-able with that matter, further solipsist-flavored ontologies about facts are no longer useful, either conceptually nor pragmatically. We have absolutely every reason to believe that facts do correspond to particular states that could be occupied by a physical system. So while human conceptual frailty can distort interpretations, it cannot distort measurement.
While human conceptual frailty can distort interpretation, a computer that is processing a video stream into a histogram is not prone to such frailty. Thus the only conclusion anyone could draw is that the real world contains facts and that machines can record them.