Initially I wanted to answer that "data" is singular (ex: "this data is useful"). But it turns out (after searching on the internet) that there are different opinions about this word.
November 8, 2012
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"Data" is the plural form of "datum", though I don't think anybody really says "datum" very much. "Alveoli" is the plural of "alveolus."
November 9, 2012
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