thumb|upright=1.3|Micro plastics of diverse shapes in sediments from four rivers in white arrowheads indicate aluminium, glass and sand (white bars represent 1mm for scale) thumb|upright=1.3|Photodegraded plastic straw. A light touch breaks larger straw into microplastics.
thumb|upright=1.3|Micro plastics of diverse shapes in sediments from four rivers in white arrowheads indicate aluminium, glass and sand (white bars represent 1mm for scale) thumb|upright=1.3|Photodegraded plastic straw. A light touch breaks larger straw into microplastics.
Microplastics are "synthetic solid particles or polymeric matrices, with regular or irregular shape and with size ranging from 1 μm to 5 mm, of either primary or secondary manufacturing origin, which are insoluble in water."
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).