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*[[Relativity of simultaneity]]: Observers who are in motion with respect to each other may disagree on whether two events occurred at the same time or one occurred before the other.
*[[Time dilation]] (An observer watching two identical clocks, one moving and one at rest, will measure the moving clock to tick more slowly)
*[[Mass in special relativity|Relativistic mass]]
*[[Length contraction]] (Along the direction of motion, a rod moving with respect to an observer will be measured to be shorter than an identical rod at rest), and
* The [[mass–energy equivalence|equivalence]] of [[mass]] and [[energy]] (written as {{nowrap|''E'' {{=}} ''mc''<sup>2</sup>}}).
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