N95: In an N95 mask (seen in false color cross section), a thin outer layer (top) and a thick inner layer (bottom) sandwich a filtration layer (purple), which traps the smallest particles. The ...
Nearly 2,000 polyester fibers can float away, unseen, from a single fleece sweater in one wash cycle, a new study reports. Synthetic lint likely makes its way through sewage-treatment systems and into ...
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