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I have just run across a question on Stack Overflow that was asked and answered last year.
The answer to this question is time-sensitive in the fact that if the same question was posed today, it may receive a different answer.
It would be interesting to see a feature that allowed you to fire a request (probably with a limit of one request per 6-12 months per question) to have each answerer of a question indicate whether or not they still stand by the answer they provided.
Is there an already established etiquette for re-asking a question?