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The Houston Chronicle says:
As of today, all you need is an Internet connection. Officials put online an image of the “Last Supper” at 16 billion pixels — 1,600 times stronger than the images taken with the typical 10 million pixel digital camera.
The high resolution will allow experts to examine details of the 15th century wall painting that they otherwise could not — including traces of drawings Leonardo put down before painting.
Check it out here. Very cool.
