Stock Photo - ATTENTION: EMBARGOED FOR PUBLICATION UNTIL 12 DECEMBER 17:00 GMT! - ILLUSTRATION - A saucer with a glas of Latte macchiato stands on a table in Berlin, Germany, 12 December 2017. For most people the Latte macchiato is a culinary delight with its visually appealing layers of light and dark. Physicians of Princeton university have been researching the possibilities of creating soft materials with different layers. Photo: Britta Pedersen/dpa. - Berlin/Berlin/Germany

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