Signed photo of Marie Curie – $23,000 (£17,970) at Skinner.

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Part of a May 8-16 online sale conducted by Skinner (23/20/12% buyer’s premium) in its Marlborough salerooms, near Boston, it is inscribed to a Mrs Roger Williams and was accompanied by a letter to that lady, thanking her for the hospitality she had shown to Marie Curie and her two daughters during her first visit to the US.