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http://www.cbc.ca/arts/books/story/2010/02/28/descartes-letter-discovery.htmlA letter by Descartes, long thought to be lost, turned up in archival papers in the Haverford College Library. A Dutch researcher found it by using Google - the finding aid had been digitized, so even though nobody in Haverford remembered it being there, it was "found" again when the Dutch researcher pointed out its existence to library staff. It has been authenticated as a genuine Descartes letter.See alsohttp://www.phil.uu.nl/~bos/unknown_letter.shtmlhttp://www.guardian.co.uk/books/2010/feb/26/rene-descartes-stolen-letter