Gold label: aligned
Predicted: aligned
Confidence: 1.0

Rationale:
The candidate's claim about a moving clock ticking more slowly becoming
substantial only near light speed directly matches the reference explanation
of special-relativity time dilation.

Text:
A clock moving rapidly relative to an observer is measured to tick more
slowly than a clock at rest with that observer. This effect becomes
substantial only when the relative speed is a significant fraction of
the speed of light.

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