SEPTEMBER 2006

X-rays reveal Archimedes secrets
By Jonathan Fildes
Science and technology reporter, BBC News
2 August 2006

(Scientists in upstate New York are working to restore a 10th Century manuscript which is the only known copy of the writings of the Greek mathematician Archimedes. The text was sold at auction for $2m in 1998 and the scientists are hoping their work will persuade the museum where it is now kept that they should be given the entire manuscript to restore.J.Hughes 12 July 2000)

A series of hidden texts written by the ancient Greek mathematician Archimedes are being revealed by US scientists.

Until now, the pages have remained obscured by paintings and texts laid down on top of the original writings. Using a non-destructive technique known as X-ray fluorescence, the researchers are able to peer through these later additions to read the underlying text.

The goatskin parchment records key details of Archimedes' work, considered the foundation of modern mathematics. The writings include the only Greek version of On Floating Bodies known to exist, and the only surviving ancient copies of The Method of Mechanical Theorems and the Stomachion. In the treatises, the 3rd Century BC mathematician develops numerical descriptions of the real world. "Archimedes was like no-one before him," says Will Noel, curator of manuscripts and rare books at the Walters Art Museum in Baltimore, Maryland and director of the imaging project. "It just doesn't get any better than re-reading the mind of one of the greatest figures of Western civilisation."

'Eighth wonder'

Revealing Archimedes' writings presents a huge challenge to the imaging team. The original texts were transcribed in the 10th Century by an anonymous scribe on to parchment. Three centuries later a monk in Jerusalem called Johannes Myronas recycled the manuscript to create a palimpsest. Palimpsesting involves scraping away the original text so the parchments can be used again. To create a book, the monk cut the pages in half and turned them sideways. To create a book Myronas also used recycled pages from works by the 4th Century Orator Hyperides and other philosophical texts.

Mr Noel describes the palimpsest as "the eighth wonder of the world". "You never get three unique palimpsested texts from the ancient world together in one book," he told the BBC News website. "That's just completely unheard of."

The monks filled the recycled pages with Greek Orthodox prayers. Later, forgers in the 20th Century added gold paintings of religious imagery to try to boost the value of the tome. The result was the near total obliteration of the original texts apart from faint traces of the ink used by the 10th Century Scribe.

Bright light

Previously the privately-owned palimpsest has been investigated using various optical and digital imaging techniques. However, much of the text remained hidden behind paint and stains. The researchers have now turned to a technique known as X-ray fluorescence to tease out the final details of the writings.

The method is used in may branches of science including geology and biology. It has previously been used by other researchers to decode ancient texts.

In August 2005 a team from Cornell University successfully deciphered a series of 2,000-year-old worn down stone inscriptions.

The X-rays are formed in a synchrotron - a particle accelerator that uses electrons travelling at close to the speed of light to generate powerful "synchrotron" light. The light covers a wide range of the electromagnetic spectrum, including powerful X-rays, a million times more intense than a transmission X-ray used in medical imaging. "In fluorescence it's like looking at the stars at night whereas in transmission it's like looking during the day," explains Dr Uwe Bergmann of the Stanford Synchrotron Radiation Lab in the US, where the work is being done. The light enables scientists to look inside matter at the molecular and atomic scale.

Glowing words

The technique is particularly useful for probing the palimpsest because the ink used by the scribe to record Archimedes' work contains iron.

"When the X-rays hit an iron atom it emits a characteristic radiation, it glows," says Dr Bergmann. "When you record the glow you can reconstruct an image of all of the iron in the book." The glowing words are displayed on a computer screen, giving the researchers the first glimpse of the text in nearly 800 years.

"It's like receiving a fax from the 3rd Century BC," said Mr Noel. "It's the most sensational feeling."

Each page takes 12 hours to reconstruct as the highly focused beam of X-rays, the width of a human hair, sweeps across the page.

The team have until the 7 August this year to scrutinise the palimpsest, before the synchrotron is switched off for maintenance. During that time they hope to scan between 12 and 14 pages, paying particular attention to the areas covered with the forged paintings. The public can watch the researchers as they reveal the glowing ancient text during a live webcast at 2300 GMT on 4 August.

From the Magazine | Science

The Unraveling of String Theory

Two new books argue that the hottest idea in physics is just a passing fad
By MICHAEL D. LEMONICK

Posted Monday, Aug. 14, 2006
By now, just about everyone has heard of string theory. Even those who don't really understand it--which is to say, just about everyone--know that it's the hottest thing in theoretical physics. Any university that doesn't have at least one string theorist on the payroll is considered a scientific backwater. The public, meanwhile, has been regaled for years with magazine articles breathlessly touting it as "the theory of everything." Brian Greene's 1999 book on the topic, The Elegant Universe, has sold more than a million copies, and his Nova series of the same name has captivated millions of TV viewers.

But despite its extraordinary popularity among some of the smartest people on the planet, string theory hasn't been embraced by everyone--and now, nearly 30 years after it made its initial splash, some of the doubters are becoming more vocal. Skeptical bloggers have become increasingly critical of the theory, and next month two books will be hitting the shelves to make the point in greater detail. Not Even Wrong, by Columbia University mathematician Peter Woit, and The Trouble with Physics, by Lee Smolin at the Perimeter Institute for Theoretical Physics in Waterloo, Ont., both argue that string theory (or superstring theory, as it is also known) is largely a fad propped up by practitioners who tend to be arrogantly dismissive of anyone who dare suggest that the emperor has no clothes.

There were good reasons for the theory's appeal when it first emerged in the late 1970s and early '80s. At the time, physicists found themselves facing a crisis: the two most important ideas of 20th century physics, relativity and quantum theory, were known to be fundamentally incompatible. Quantum theory describes the universe as intrinsically discontinuous: energy, for example, can come in bits just so small, but no smaller. Relativity treats time and space and gravity as a smooth, unbroken continuum. Each theory has its purposes, and they usually don't overlap. But when dealing with very large masses or time periods that are infinitesimally small, like the core of a black hole or the first moments after the Big Bang, neither quite works.

The answer, argued theorists John Schwartz of Caltech and Michael Green of Cambridge University, was to think of the basic units of matter and energy not as particles but as minuscule, vibrating loops and snippets of stuff resembling string, which turn out to exist not just in our familiar four dimensions of space and time but in 10 or more dimensions. Bizarre as it seemed, this scheme appeared on first blush to explain why particles have the characteristics they do. As a side benefit, it also included a quantum version of gravity and thus of relativity. Just as important, nobody had a better idea. So lots of physicists, including Woit and Smolin, began working on it.

Since then, however, superstrings have proved a lot more complex than anyone expected. The mathematics is excruciatingly tough, and when problems arise, the solutions often introduce yet another layer of complexity. Indeed, one of the theory's proponents calls the latest of many string-theory refinements "a Rube Goldberg contraption." Complexity isn't necessarily the kiss of death in physics, but in this case the new, improved theory posits a nearly infinite number of different possible universes, with no way of showing that ours is more likely than any of the others.

That lack of specificity hasn't slowed down the string folks. Maybe, they've argued, there really are an infinite number of universes--an idea that's currently in vogue among some astronomers as well--and some version of the theory describes each of them. That means any prediction, however outlandish, has a chance of being valid for at least one universe, and no prediction, however sensible, might be valid for all of them.

That sort of reasoning drives critics up the wall. It was bad enough, they say, when string theorists treated nonbelievers as though they were a little slow-witted. Now, it seems, at least some superstring advocates are ready to abandon the essential definition of science itself on the basis that string theory is too important to be hampered by old-fashioned notions of experimental proof.

And it is that absence of proof that is perhaps most damning. Physicists have a tolerance for theory; indeed, unless you were there to witness a phenomenon yourself--the Big Bang, say--it will always be, at some level, hypothetical. But the slow accretion of data and evidence eventually eliminates reasonable doubt. Not so--or at least not yet--with strings.

"It's fine to propose speculative ideas," says Woit, "but if they can't be tested, they're not science." To borrow the withering dismissal coined by the great physicist Wolfgang Pauli, they don't even rise to the level of being wrong. That, says Sean Carroll of the University of Chicago, who has worked on strings, is unfortunate. "I wish string theorists would take the goal of connecting to experiment more seriously," he says. "It's true that nobody has any good idea of how to test string theory, but who's to say someone won't wake up tomorrow morning and think of one? The reason so many people keep working on it is that, whatever its flaws, the theory is still more promising than any other approach we have."

AN ARTIST JOINS IN THE BEYOND THE BEYOND

  So-called abstract painting has never been wholly original, has never been its own end. Such creation exists only where art presents images that take nothing from what has been imagined, neither repeating nor modifying a particular artist's vision, but inventing its own, liberated from both and all.   One must move toward an art where everything must be sacrificed to the truths and necessities of a new millennium, toward those elements of a pure and eternal art, full and infinitely beyond our known experience. One must move toward the pixel and beyond.     -  Taki Murakishi, from STRING THEORIES..