Archimedes and the Linear Accelerator.

[Nemesis]

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By ALEX DOMINGUEZ
Associated Press Writer

May 21, 2005, 4:30 PM EDT

BALTIMORE -- A particle accelerator is being used to reveal the long-lost writings of the Greek mathematician Archimedes, work hidden for centuries after a Christian monk wrote over it in the Middle Ages.

Highly focused X-rays produced at the Stanford Linear Accelerator Center were used last week to begin deciphering the parts of the 174-page text that have not yet been revealed. The X-rays cause iron in the hidden ink to glow.

"One of the delightful things is we don't know what it's going to say," said William Noel, head of the Archimedes Palimpsest project at the Walters Art Gallery.

Scholars believe the treatise was copied by a scribe in the 10th century from Archimedes' original Greek scrolls, written in the third century B.C.

It was erased about 200 years later by a monk who reused the parchment for a prayer book, creating a twice-used parchment book known as a "palimpsest." In the 12th century, parchment -- scraped and dried animal skins -- was rare and costly, and Archimedes' works were in less demand.