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run slow," when looking at it from the other person's perspective,_______________________________________________
into "well, I am now moving, so the other person's clock must be
running faster since it is 'at rest.'" Until students are thoroughly
imbued with the idea that *all* motion is relative, they will not
understand the symmetry inherent in Einstein's relativity, and the
ensuing requirement that absolute simultaneity must be abandoned.
This is one of the most important results of relativity and one of
the most difficult for students to understand. As long as they
haven't completely internalized the idea that all motion is relative,
they will never understand the issues around simultaneity.
Hugh
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