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The plastisphere is six decades in the making. It's a product of the discarded plastic - flip-flops, margarine tubs, toys, toothbrushes - that gets swept from urban sewer systems and river channels into the sea.
When that debris washes into the ocean, it breaks down into bits that are colonised by microscopic organisms that scientists are just beginning to understand. Researchers suspect that some of the denizens may be pathogens hitching long-distance rides on floating junk. [Source: Gulf Times]
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