Eumelanin, the brown-black pigment that darkens human skin, and natural organic matter (NOM), the substance that turns rivers, lakes, and soils amber and brown, would seem to have little in common. One is manufactured inside living cells to shield them from ultraviolet light. The other is the leftover residue of dead organisms, broken down over time by sunlight and microbes. Yet a new study from researchers at Ohio State University and Texas A&M…
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