“There were black swans, though civilized people had existed for three thousand years on the earth…”

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“There were black swans, though civilized people had existed for three thousand years on the earth without meeting with them… the uniform experience, therefore, of the inhabitants of the known world, agreeing in a common result, without one known instance of deviation from that result, is not always sufficient to establish a general conclusion.”

John Stuart Mill, A System of Logic

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