Popper: Life and Main Philosophical Ideas

Biographical Background

Karl Popper lived from 1902 to 1994. Born in Vienna, he later emigrated to New Zealand and then Britain. He is best known for philosophy of science and political philosophy. His major works include The Logic of Scientific Discovery, The Open Society and Its Enemies, and The Poverty of Historicism.

Popper engaged the same scientific context as logical positivism but rejected verificationism.

Philosophical Thought

Popper's key idea is falsificationism. Scientific theories cannot be conclusively verified by finite observations. No number of observed white swans proves that all swans are white, but one black swan can falsify it. A theory is scientific only if it risks possible refutation.

Science advances by bold conjectures and severe attempts at refutation. We never possess final certainty; we improve by discovering errors. Observation itself is theory-laden, so science does not begin with pure facts.

Popper criticized theories that seemed able to explain every possible outcome, such as certain forms of Marxism or psychoanalysis. If a theory is compatible with everything, it risks explaining nothing scientifically.

His epistemology is fallibilist. Rationality means openness to criticism, not possession of indubitable foundations.

In political philosophy, Popper defended the open society. An open society allows criticism, reform, individual freedom, and institutional correction of error. Closed societies suppress criticism in the name of tradition, destiny, nation, class, or historical necessity.

He opposed historicism, the belief that history follows discoverable laws that allow prediction of humanity's destiny. Such beliefs can justify authoritarian politics. Popper favored piecemeal social engineering: limited reforms tested by consequences rather than utopian remaking of society.

Popper's importance lies in connecting science and democracy through criticism, fallibility, and openness to correction.