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And once it's there, it moves around. And around. There's a new report on the worm out this week in the New England Journal of Medicine.
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More than a trillion plastic bags are used annually. They're made of a notoriously resilient kind of plastic called polyethylene – but scientists have found that wax worms are able to break them down.
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Armyworms — caterpillars of a moth species — are creeping across ever wider swaths of southern Africa, munching their way through crops.