All sorts of nasties—lead, mercury, radium, nitrates, norovirus, agricultural runoff, PFAS, and more—can lurk in your water. No surprise, then, that about 40% of U.S. homes filter theirs. But the ...

Engineers fabricated a simple water filter modeled after the mobula ray’s plankton-filtering features. Pictured are pieces of the filter. Filter feeders are everywhere in the animal world, from tiny ...

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