A nut used in herbal tea has become a hydrogel perfect for a variety of biomedical uses in new research. Scientists created a malva nut hydrogel for medical uses ranging from wound care to ECG readings. The research doesn't rely on the rumored health benefits of the nuts -- in China, they're known as the sore throat remedy Pangdahai (PDH) -- but for their ability to swell 20 times their weight in water.
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