I thought it was already pretty well understood that "Celtic" is only meaningful as a linguistic grouping, but it seems the old idea of a separate "Celtic race" or "Irish race" is pretty strongly embedded, even now:
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"... Once maintenance is complete, the Slashdot frontpage will no longer be accessible."
(Interesting. When I preview this, the blockquote tags are ignored. Oh well, I'll add an i tag so it blockquotes anyway)