Cognitive Scaffold

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MENTAL MODEL · M0008

Segal's Law

Segal's Law
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Version 1.0.0 · Updated 2026-07-28

CORE DEFINITION

Segal’s law says: “A man with a watch knows what time it is. A man with two watches is never sure.” It concerns conflicting information, not Siegel’s theorems in number theory. Certainty from one source does not guarantee accuracy.

SCAFFOLDING EFFECT

psychology

Reduce cognitive load

When sources disagree, check reliability and calibration rather than arbitrarily discarding contrary information.

anchor

Anchor fast decisions

Disagreeing readings expose uncertainty that one reading can conceal; an independent standard helps assess error. This is an epistemic lesson from an adage, not a mathematical theorem.

MINIMUM ACTION

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Source support: Explicit

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    en.wikipedia.orghttps://en.wikipedia.org/wiki/Segal%27s_lawZH · Explicit
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