Cobra Effect · Science and philosophy
Kuhn’s paradigm shifts
How science changes, not step by step, but by revolution.
6 cards, read aloud in 2:26, with a test and sources.
A physicist is asked to teach a history class and it ruins his career plan.
Thomas Kuhn was finishing a doctorate in physics when he had to read Aristotle on motion. By modern standards it was wrong in every line. Then it clicked. Aristotle had not been answering the questions Kuhn was asking. He changed fields.
In 1962 he published what he had worked out.
The Structure of Scientific Revolutions says that most science is not a hunt for revolutions. It is puzzle solving inside a settled framework that tells you which puzzles count. Kuhn called the framework a paradigm and the daily work normal science.
Then the puzzles that will not solve start piling up.
An anomaly is not a disproof. It is a job for next year. Gather enough of them and the patches get elaborate, and confidence starts to go. Kuhn called that a crisis, and it is the only time a field looks seriously at a rival framework.
The switch, when it comes, is not a tidy sum.
A new framework arrives and the old questions change rather than get answered. Kuhn said the two sides talk past each other, because the same words mean different things in each. Mass means one thing to Newton and another to Einstein. He quoted Max Planck, who said a new truth wins when the people who opposed it eventually die.
Then the word escaped.
Kuhn used paradigm in many different senses, and one critic counted more than 20 of them. By 1969 he was trying to tighten it up, and it was already gone. Today a new brand of yoghurt is a paradigm shift. The idea underneath is far narrower and far more useful.
So when a field argues, ask which stage it is in.
Puzzles being solved inside agreed rules is a healthy field, and the boring work is the real work. Anomalies stacking up behind ever larger patches is a field near a change. And if two experts cannot agree what the question means, you are watching a crisis, not a debate.
Sources
- The Structure of Scientific Revolutions, Thomas S. Kuhn, 1962. The book itself, short and readable by the standards of philosophy. This page lays out normal science, anomaly, crisis and revolution, and the arguments that followed.
- Against Method, Paul Feyerabend, 1975. The wilder answer to the same question, arguing that no single method describes how science has actually advanced. Useful as the opposite corner of the room.
- Thomas Kuhn, Stanford Encyclopedia of Philosophy. A careful account of what he meant by a paradigm, why he spent years regretting the word, and how much of the argument survives.
Nearby ideas
- Falsifiability. A claim that nothing could disprove tells you nothing.
- The Semmelweis reflex. Why experts reject evidence that says they have done harm.
- The replication crisis. Why many famous findings vanished when others tried them again.
- Galileo’s ship. Why you cannot feel steady motion from the inside.
- Eratosthenes measures the Earth. How a shadow and some arithmetic measured the size of the Earth.
- The sorites paradox. Vague words have no edges, but rules force them to have one.
- Zeno’s paradoxes. Endless steps can still add up to a finish line.
- The experience machine. Would you trade real life for guaranteed happy feelings?