Question: Why does Spock use his left hand for the "live long and prosper" greeting to the older Vulcans?
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Chosen answer: Presumably, it must have been much easier for him to use the left hand to do the Vulcan salute over his right hand. Though most people in Star Trek do the Vulcan salute with their right hand, there is no rule saying which hand someone has to use in order to do the Vulcan salute with.
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