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3D CT scan of a cylindrical Proteus sample, showing the cutting disc, ceramic spheres in blue, particulate matter in red and cracks in green.

Credit: Dr. Florian Bittner, Institute of Plastics and Circular Economy IKK, Leibniz University Hannover, Germany / Fraunhofer Institute for Wood Research, Wilhelm-Klauditz-Institut WKI, Hannover, Germany.

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