Microplastics are everywhere, from the Mediterranean seafloor to Mount Everest, and the tiny fragments of litter can take hundreds of years to degrade. They can also absorb heavy metals and pollutants that could harm humans or animals that inadvertently consume them. At less than 5mm in length, the polymers are hard to remove manually. But there may be a more efficient method of eliminating the plastic scourge: attacking them with bacteria-sized robots. Scientists at the University of Chemistry and Technology in Prague recently developed self-propelled microrobots that can swim onto microplastics and break them down. The tiny bots — about the size of a…

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