Why Trust Science? Perspectives from the History and Philosophy of Science

Contemporary Disruption of Scientific Authority and Public Controversies

• Public confusion regarding empirical matters—such as vaccination safety, climate change, and personal health practices—stems from widespread disputation of established scientific consensus in popular media and online platforms.
• Key public controversy examples include:
  • Vaccination Safety: During a 2016 presidential debate, Donald Trump rejected medical consensus (including the stance of fellow candidate and physician Ben Carson) by alleging that vaccines cause autism, referencing an employee's child. Trump advocated for lower, more widely spaced vaccine doses. Medical professionals widely reject delayed schedules because they increase child vulnerability to preventable, deadly diseases such as measles, mumps, diphtheria, tetanus, and pertussis, leading to increased morbidity and mortality.
  • Age of the Earth and Evolution: Former Vice President Mike Pence aligns with Young-Earth Creationism, holding that God created the Earth and all living beings less than $10{,}000$ years ago. In contrast, the scientific consensus establishes that:
  • The Earth is approximately $4.5 \text{ billion}$ years old ($4.5 \times 10^9\text{ years}$).
  • The genus Homo emerged between $2 \text{ million}$ and $3 \text{ million}$ years ago.
  • Anatomically modern humans (Homo sapiens sapiens) appeared approximately $200{,}000$ years ago.
  • Life evolved primarily via natural selection without requiring supernatural intervention, sharing a common ancestor with primates.
  • Gallup polling demonstrates significant public alignment with creationism: $41\text{\%}$ of regular US churchgoers, $58\text{\%}$ of Republicans, $39\text{\%}$ of Independents, and $34\text{\%}$ of Democrats believe God created humans in their present form within the last $10{,}000$ years. In 2012, Tennessee enacted a statute permitting creationism instruction in science classrooms.
  • Anthropogenic Climate Change: The American Enterprise Institute (AEI), a Washington, DC think tank committed to laissez-faire economics, limited government, and low taxation, has systematically promoted skepticism regarding anthropogenic climate change and disparaged the Intergovernmental Panel on Climate Change (IPCC). AEI scholars accused climate scientists of suppressing dissent and offered cash incentives for finding errors in IPCC reports. In 2017, an AEI scholar framed public scientists as a politically buffeted "interest group," questioning why their analysis should be viewed ex ante as more authoritative than analysis from the petroleum industry.
• The central intellectual dilemma: Scientific authority on empirical matters, accepted in Western nations since the Enlightenment, cannot be sustained without explicit justification.
• Pragmatic utility does not equal truth. Multiple historical theories produced successful empirical predictions and practical utility before being discarded as fundamentally incorrect:
  • Ptolemaic astronomy
  • The caloric theory of heat
  • Classical mechanics
  • The contraction theory of the Earth

Historical Foundations of Scientific Authority: From Individual Virtue to Comtean Positivism

• 18th and Early 19th Century Authority: Scientific authority originally resided in the personal integrity and character of the individual "man of science." Honor societies—such as the Royal Society, the Académie des Sciences, and the US National Academy of Sciences (established during the Civil War to advise President Abraham Lincoln)—served to identify trusted individuals whose opinions were deemed authoritative.
• Auguste Comte and the Positive Stage: Auguste Comte ($1798\text{--}1857$), founder of sociology and modern positivism, shifted authority from individual character to scientific method. Comte introduced the concept of positive knowledge (reliable empirical truth derived from method rather than doctrine).
• The Law of Three Stages: Comte's teleological view of history posited that human thought progresses through three stages:
  • Theological or Fictitious: Explanation via supernatural entities.
  • Metaphysical or Abstract: Explanation via abstract forces or essences.
  • Scientific or Positive: Abandonment of absolute truth, ultimate origins, and final causes in favor of discovering invariable relations of succession and likeness through combined reasoning and observation.
• Characteristics of Comtean Positivism:
  • Heavily indebted to British empiricists, including Francis Bacon ("no real knowledge except that which rests upon observed facts") and David Hume.
  • Comte was not a naive positivist; he recognized that theories structure observations just as observations structure theories ($\text{to observe, our mind has need of some theory or other}$).
  • Recognized that primitive religion and metaphysics were necessary early cognitive steps for structuring observations.
  • Advocated fallibilism, accepting that future empirical observations would continuously refine knowledge.
  • Insisted that positive method must be studied empirically by observing science in action.

Logical Empiricism and the Verification Principle

• 20th-Century Logical Positivism: Formulated by the Vienna Circle and popularized in the English-speaking world by A. J. Ayer ($1910\text{--}1989$) in Language, Truth and Logic ($1936$).
• The Verification Principle of Meaning: A statement is meaningful if and only if it can be verified by reference to empirical observation.
  • Formulary definition: A statement is verifiable if an observation statement can be deduced from it in conjunction with background premises, without being deducible from those background premises alone.
  • Serves as a criterion of demarcation: Scientific claims are verifiable through observation, whereas unverifiable claims (religion, metaphysics, political ideology) are rendered meaningless.
• The Problem of Induction: Derived from David Hume, logical empiricists acknowledged that inductive generalizations are probabilistic rather than absolute. This led to distinctions between strong and weak verification.
• Key logical empiricists included Carl Hempel (focusing on hypotheses in observation statements), Rudolf Carnap (analyzing observational language), Otto Neurath, and W. V. O. Quine (who later challenged observational confirmation).

Falsificationism and Critical Rationalism: Karl Popper

• Karl Popper ($1902\text{--}1994$): Rejected logical empiricism, inductive logic, and verificationism.
• The Black Swan Problem: Inductive inferences cannot be established with logical necessity. Observing thousands of white swans cannot prove all swans are white, because a single observation of a black swan (such as in Perth, Australia) falsifies the generalization.
• Logical Asymmetry: Verification is always provisional, whereas falsification can be logically definitive.
• Falsifiability as Demarcation: The defining characteristic of scientific claims is not that they can be verified by observation, but that they can be refuted by observation. Science proceeds via Conjectures and Refutations driven by an attitude of critical skepticism.
• Critical Rationalism and Politics: Popper linked his epistemology to open, democratic governance, opposing authoritarianism and criticizing Marxism ("scientific socialism") for treating theoretical flaws as anomalies to be explained away rather than valid refutations.
• Corroboration and its Limits: To avoid total skepticism, Popper introduced corroboration—the status achieved by theories that survive severe empirical tests (e.g., the deflection of starlight testing general relativity). However, defining what constitutes a "severe" test introduces subjective judgment into test evaluation.

The Social Turn: Ludwik Fleck and Thought Collectives

• Ludwik Fleck ($1896\text{--}1961$): Microbiologist who authored The Genesis and Development of a Scientific Fact: An Introduction to the Theory of Thought Style and Thought Collective ($1935$).
• Shift to Social Epistemology: Fleck established that scientific activity is fundamentally collective rather than individualistic.
• Core Fleckian Concepts:
  • Thought Collective (Denkkollektiv): A community of researchers providing shared intellectual resources and ways of thinking.
  • Thought Style (Denkstil): The shared cultural, technical, and conceptual framework of a thought collective that governs how observations are gathered, interpreted, and understood.
• Evolution of Scientific Ideas:
  • Scientific ideas pass between individuals, undergoing minor transformations at each exchange. Over time, accumulated adjustments drastically alter thought styles, rendering older frameworks indecipherable.
  • Facts are the collective accomplishments of communities rather than discoveries by isolated individuals.
• Anti-Realism and Institutional Progress: Scientific truth represents what a thought collective has settled upon at a given moment. Progress depends directly on institutional structures—such as conferences, workshops, peer-reviewed journals, and scientific societies.

Under-determination and Theoretical Holism: Pierre Duhem and W. V. O. Quine

• Pierre Duhem ($1861\text{--}1916$): Physicist, historian, and philosopher; author of The Aim and Structure of Physical Theory ($1906$).
• Refutation of Crucial Experiments (Experimentum Crucis): Duhem argued that isolated hypotheses cannot be tested individually. Every experimental test puts an entire theoretical group into play, including background assumptions, auxiliary hypotheses, and experimental apparatus.
  • As prefaced by Louis de Broglie ($1953$), experimental confirmation of a single consequence cannot provide crucial proof, because unexamined consequences or alternative theoretical explanations remain possible.
  • Example: Léon Foucault's experiment showing that light travels slower in water than in a vacuum disproved Newton's specific corpuscular model, but did not rule out all possible corpuscular theories.
• Duhem's Non-Radical Holism:
  • When predictions fail, experiments show that an error exists somewhere within the theoretical nexus, but cannot isolate the precise faulty assumption.
  • Certain core scientific commitments (e.g., measuring instruments like thermometers, or foundational principles like conservation of mass and energy) are accepted beyond dispute to avoid operational paralysis.
  • Rejection of dogmatism in favor of anti-dogmatism (Claude Bernard), Pascalian insight ("reasons which reason does not know"), and expert judgment ("good sense").
• W. V. O. Quine ($1908\text{--}2000$) and Radical Holism: Reformulated Duhem's view into the Duhem-Quine Thesis:
  • Statements face sense experience only as a corporate body ("Web of Belief").
  • Quine asserted: $\text{any statement can be held true, come what may, if we make drastic enough adjustments elsewhere in the system.}$ This under-determination of theory by evidence weakened traditional empiricist accounts of scientific belief.

Paradigm Shifts and the Birth of Science Studies: Thomas Kuhn

• Thomas Kuhn ($1922\text{--}1996$): Author of The Copernican Revolution ($1957$) and The Structure of Scientific Revolutions ($1962$).
• Structure of Scientific Progress:
  • Paradigm: A set of shared exemplars, theoretical commitments, values, and methodological beliefs unifying a scientific community.
  • Normal Science: Routine puzzle-solving conducted strictly within an established paradigm without attempting refutation.
  • Anomalies: Empirical puzzles that consistently resist solution within the prevailing paradigm.
  • Crisis: Accumulation of severe anomalies that destabilizes confidence in the governing paradigm.
  • Scientific Revolution: The replacement of an old paradigm by a new, incompatible paradigm, operating like political restructuring.
• Incommensurability: Successive paradigms cannot be directly compared using a common metric because paradigm shifts change meanings, values, priorities, and theoretical terms.
• Reactions and Alternative Metaphors:
  • Imre Lakatos criticized incommensurability as reducing paradigm choices to a "mystical conversion."
  • Historians noted that comparing non-proximate eras (e.g., Aristotelian physics vs. quantum mechanics) obscures intermediate transitional steps.
  • In The Copernican Revolution, Kuhn described major theoretical change as a "bend in the road," where each road segment is visible only from specific vantage points.

Sociology of Scientific Knowledge and Methodological Anarchism

• Sociology of Scientific Knowledge (SSK) / The Edinburgh School:
  • Barry Barnes: Introduced interest theory, demonstrating how professional, political, religious, or ethical interests drive theory selection.
  • David Bloor: Established the Symmetry Principle, requiring that identical types of causes must explain both true and false beliefs. Bloor emphasized contrasting relativism with absolutism rather than with objectivity or truth.
  • Steven Shapin and Simon Schaffer: Demonstrated that solutions to the problem of knowledge are intrinsically solutions to the problem of social order.
  • Provocative sociological characterizations: Karin Knorr-Cetina framed knowledge as "fabrication"; Harry Collins claimed the natural world does not constrain belief; Bruno Latour defined science as "politics by other means."
• Paul Feyerabend ($1924\text{--}1994$) and Epistemological Anarchism:
  • Against Method ($1975$): Denied the existence of a universal scientific method, arguing that rigid methodological rules impede creativity and scientific progress.
  • "Anything Goes": Feyerabend's single defensible principle under all circumstances, meaning no fixed methodological standard can accommodate the complex material of history.
  • Showed that famous scientists historically ignored non-conforming empirical facts to advance their theories.
• Bruno Latour's Anthropological Approach: Established laboratory ethnography, privileging observed scientific actions over retrospective statements. Combined research confirmed widespread methodological diversity across scientific domains.

Re-Envisaging Objectivity: Social Epistemology and Feminist Philosophy

• Feminist Critique of Science: Questioned claims of objectivity in communities that excluded women, people of color, and working-class scholars while generating theories reflecting social biases.
• Sandra Harding and Standpoint Epistemology:
  • Standpoint Epistemology: Knowledge perspectives are inherently shaped by the social positions of investigators.
  • Weak Objectivity: Homogeneous communities produce weak objectivity because shared background assumptions remain invisible and unexamined.
  • Strong Objectivity: Developed in The Science Question in Feminism ($1986$). Strong objectivity requires increasing community heterogeneity to maximize the diversity of perspectives brought to bear on scientific problems.
• Helen Longino and Transformative Interrogation:
  • Self-Correction as a Social Process: Science corrects itself through "transformative interrogation"—the social give-and-take of critical debate, peer review, and mutual questioning.
  • Rejection of Claude Bernard's ideal that scientists can strip off personal values like an overcoat before entering the laboratory.
  • Objectivity as Community Practice: Objectivity is a property of community practices rather than an individual attitude. It requires:
  • Recognized, robust avenues for criticism (e.g., peer review).
  • Community responsiveness to critique.
  • Shared standards for evaluation.
  • Diversity of membership to make implicit assumptions explicit (e.g., Einstein questioning the baseline assumption of the variable speed of light).

Grounds for Informed Trust and Critical Caveats

• Consensual Model of Science: Scientific claims are accepted not because of a singular method or individual genius, but because they reflect the critically achieved consensus of a diverse scientific community.
• Dual Basis for Trust in Science:
  • Sustained Empirical Engagement: Scientists are trained, certified experts dedicated to studying specific empirical domains, analogous to licensed plumbers, electricians, or nurses.
  • Social Vetting Procedures: Institutional procedures—such as journal peer review, tenure certification, bias-balancing panels at the US National Academy of Sciences, and geographically/demographically diverse writing teams at the IPCC—prevent individual biases from dominating.
• Qualifications and Exceptions:
  • Trust is probabilistic rather than absolute; closed or clique-dominated scientific communities warrant skepticism.
  • Healthy critical debate example: The Extended Evolutionary Synthesis (EES)—challenging genetic centrality by emphasizing developmental plasticity, niche construction, epigenetics, and social learning—encountered resistance, yet proponents successfully published and secured funding, demonstrating community openness.
  • Limits of Expertise: Scientists lack special authority outside their narrow expertise. Historical missteps include:
  • John von Neumann ($1950\text{s}$) claiming nuclear energy would become as free as "unmetered air."
  • William Shockley advocating voluntary sterilization based on eugenicist theories.
  • Wernher von Braun predicting moon-born children by the year $2000$
  • Historical support among early 20th-century biologists for eugenics programs.
• Indigenous, Lay, and Civilizational Knowledge:
  • Susantha Goonatilake's concept of civilizational knowledge recognizes traditions like Traditional Chinese Medicine (TCM), acupuncture, and Ayurveda, which hold empirical track records of clinical efficacy.
  • Colin Scott showed Cree hunting traditions operate empirically and scientifically.
  • Lay experts (farmers, midwives, patients, fishermen) often possess localized empirical expertise superior to Western scientific literature in specific contexts (e.g., Polynesian navigators outperforming European sailors prior to the late 18th century Cook era).
  • Distinction from Disinformation: Legitimate lay/indigenous knowledge traditions differ from bad-faith, non-expert claims (e.g., non-immunologist celebrities claiming vaccines cause autism, or oil executives attributing climate change to sunspots).
• Scientific vs. Normative Questions: Empirical facts must be distinguished from policy or moral choices (e.g., Pope Francis rejecting GMOs on theological grounds rather than disputing health safety data).

Structural Conflict of Interest and Industrial Disinformation

• Ex Ante Distrust of Industry Claims: Skepticism toward corporate scientific claims (e.g., fossil fuel firms on climate change, tobacco companies on lung disease, Coca-Cola on obesity) is justified by fundamental conflicts of interest.
  • The primary imperative of commercial industries is shareholder profit.
  • Scientific findings demonstrating product danger directly threaten corporate profitability and operational survival.
• Historical Patterns of Corporate Disinformation:
  • Tobacco Industry: For decades, suppressed internal research linking smoking to cancer, heart disease, emphysema, bronchitis, and sudden infant death syndrome (SIDS), while funding legitimate yet distracting research to obscure health risks.
  • Chemical and Processed Food Industries: Deployed similar tactics regarding pesticides, endocrine-disrupting chemicals, sugar, and diabetes.
• Weaponized Skepticism ("Doubt-Mongering"):
  • Industrial interests weaponize scientific doubt to create artificial public controversy, undermine legitimate consensus, and force climate and public health scientists into defensive postures.
  • Industrial research is legitimate when scientists participate in genuine academic communities, disclose financial links, and submit work to peer review without suppressing unfavorable findings.
  • Good-faith critical interrogation requires participants to possess a genuine commitment to truth without intellectually compromising financial conflicts of interest.