Number 514
Date Dec. 8th 2008
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Simultaneous is the 514th xkcd comic.


This is a reference to a phenomenon in Special Relativity called "Relativity of Simultaneity ." It basically says that two observers moving at different speeds will disagree about events that, to one observer, seem to happen simultaneously. So it is absolutely impossible to say whether two events seperated in space happen "at the same time"

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"I'm leaving you for your twin. He's more mature than you by now."


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