Audio long-read: How harmful are microplastics?
Nature Podcast
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Nano Plastics Are Invisible
Researchers know almost nothing about nano plastics. They are invisible and cannot simply be scooped up. One study deliberately let pregnant mice inhale extremely tiny particles, later found the particles in almost every organ in their foetuses. To enter cells, particles generally need to be smaller than a few hundred nanometers. There was no formal definition of anano plastic until 20 18 when french searchers propose the upper size limit of one micrometer.
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