सुबह की कॉफ़ी में छिपा हो सकता है खाने में मौजूद घातक रंगों का पता लगाने का राज़: Scientists have found a simple yet effective method of detecting toxic molecules at incredibly low concentrations – by exploiting the same phenomenon that makes coffee stains. When a coffee drop evaporates on a tabletop, it creates a distinctive dark circle around the edge. This daily phenomenon, known as the coffee-stain effect, occurs because as the
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