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No number of sightings of white swans can prove the theory…

“No number of sightings of white swans can prove the theory that all swans are white. The sighting of just one black one may disprove it.” quote by Karl Popper
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“No number of sightings of white swans can prove the theory that all swans are white. The sighting of just one black one may disprove it.”

Karl Popper

About This Quote

This interpretation was drafted with AI assistance. It is one reading of the quote, not the author's own explanation.

A single counter‑example (a black swan) can falsify a universal claim (all swans are white), illustrating the falsifiability principle in science.

In simple terms: One exception can disprove a general rule.

Key Takeaway

Seek counter‑examples to test theories.

Themes

science logic philosophy methodology critical thinking

Mood

analytical skeptical inquisitive

Type

philosophical scientific

When to use this quote

  • research design
  • policy analysis
  • education
  • debate clubs

Key Concepts

falsifiability induction empiricism

Questions to Reflect On

  • How do you test universal claims?
  • What role do anomalies play in progress?
A Different Perspective

Finding counter‑examples can be difficult in complex systems.

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