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Comparison of the visible manuscript page (top) and the X-ray fluorescence image (bottom) of the Syriac Galen Palimpsest.  The horizontal text in pale red (bottom image) is the original Galen text.
How the same technique helped reveal both a 6th century medical text and an ancient bird feather’s pigment.
Embedded in sea ice for a year, a shipborne observatory will take a rare look at conditions in the rapidly evolving central Arctic.