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					Originally Posted by Alex  I don't think there are "basic rules of alternate realities" though you're right that such a rule is not infrequent in the genre. Don't think it has ever been suggested for Star Trek though. | 
	
 In fact, that was one of the nicely sly bits ... Old Spock explaining to Spock how easy it was to get Kirk to assume the universe would implode if 2 of the same people were to meet in a temporal paradox ... but, no, that's just a wive's tale.  Hehehe.