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A path through philosophy

What is science?

What makes knowledge scientific — and how does nature yield its laws?

Science is our most powerful way of knowing, yet its own foundations are strangely hard to secure. Follow the search for method — from the four causes to falsifiability — and the recurring worry that no amount of evidence can ever quite close the gap.

  1. 1
    Aristotle384–322 BCEPeripatetic (The Lyceum)

    The first program of science: to know a thing is to know its four causes; genuine knowledge is demonstration from first principles, grounded in patient observation of nature.

  2. 2
    Francis Bacon1561–1626 CEEmpiricism

    The New Organon: sweep away inherited authority and the mind's 'idols', and wring nature's laws from it by systematic experiment and induction.

    Responding toAristotle's deduction from received principles

  3. 3
    René Descartes1596–1650 CERationalism

    Reads nature as a machine written in mathematics; certainty flows from clear reason, and the physical world reduces to matter in motion.

    Responding toBacon's trust in the senses

  4. 4
    David Hume1711–1776 CEEmpiricism

    The problem of induction: no run of past observations can logically guarantee the next case, so our faith in laws of nature rests on habit, not proof.

    Responding toBacon and the inductivists

  5. 5
    Immanuel Kant1724–1804 CECritical Philosophy

    Rescues Newtonian science from Hume: the mind itself supplies causality and mathematical form, so the laws hold with necessity — but only for the world as it appears.

    Responding toHume's doubt about causation

  6. 6
    John Stuart Mill1806–1873 CEUtilitarianism

    Turns method into a toolkit: the experimental methods of agreement, difference, residues, and concomitant variation are how we actually track down causes.

    Responding toHume's challenge, in practice

  7. 7
    Charles Sanders Peirce1839–1914 CEPragmatism

    Beyond deduction and induction lies abduction — inference to the best explanation; science is a self-correcting process that converges on truth in the long run.

  8. 8
    Karl Popper1902–1994 CEPhilosophy of Science

    No theory is ever verified; what marks a claim as scientific is that it forbids something — it is falsifiable — and knowledge grows by bold conjecture and ruthless testing.

    Responding tothe inductivists and the verificationists

  9. 9
    Thomas Kuhn1922–1996 CEPhilosophy of Science

    Science is not steady accumulation: long stretches of 'normal science' under a shared paradigm are broken by revolutions that replace the framework itself.

    Responding toPopper's picture of rational falsification

  10. 10
    W. V. O. Quine1908–2000 CEAnalytic Philosophy

    There is no clean line between theory and observation, or the analytic and the empirical: our beliefs meet experience as one connected web, revisable at any point.

    Responding tothe positivists' tidy divisions

Each attempt to pin down 'the scientific method' is answered by a deeper doubt — about induction, about paradigms, about the line between fact and theory. Science advances anyway, which may be the most interesting fact of all.