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===== Straight Line is Longest =====

(Lecture: 10 minutes)

See the discussion at the end of (ss)[[gsr>book:gsr:twin|8.3]]
of [[gsr>|the text]].

==== Reflections ====

This topic is optional, but is yet another surprising property of special
relativity.  The discussion in the text, in the context of the twin paradox,
provides an intuitive justification --- and this topic could alternatively be
covered as part of an early discussion of the twin paradox.

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