This Rembrandt etching is titled, "Self Portrait Leaning on a Stone Sill," ca. 1639, etched by famed Dutch artist, Rembrandt Harmensz van Rijn (1606–1669), at the Herbert F. Johnson Museum of Art at Cornell University, in Ithaca, N.Y., Thursday, Oct. 2, 2014. Richard Johnson, a Cornell University computer engineering professor, has developed a way to date and authenticate the centuries-old works by analyzing X-ray images of the art. (AP Photo/Heather Ainsworth)
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