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http://www.msnbc.msn.com/id/14226275/

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SAN FRANCISCO - Previously hidden writings of the ancient Greek mathematician Archimedes are being uncovered with powerful X-ray beams nearly 800 years after a Christian monk scrubbed off the text and wrote over it with prayers.

Over the past week, researchers at Stanford University's Linear Accelerator Center in Menlo Park have been using X-rays to decipher a fragile 10th century manuscript that contains the only copies of some of Archimedes' most important works.

The X-rays, generated by a particle accelerator, cause tiny amounts of iron left by the original ink to glow without harming the delicate goatskin parchment.
For reference: http://encarta.msn.com/encnet/refpag...efid=761558086
http://en.wikipedia.org/wiki/Archimedes
 
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