Pompeii’s famous public baths weren’t always the polished, near-sterile wellness centers we tend to imagine. A new scientific study has found strong chemical signs that some of the city’s earliest bathing pools were contaminated by human waste and weren’t refreshed often, meaning ancient bathers were, quite literally, soaking in yesterday’s grime. According to the study report recently published in PNAS , the research team reconstructed bathing conditions by analyzing carbonate deposits (the crusty “limescale” left behind by water) preserved in Pompeii’s hydraulic infrastructure. Those mineral layers captured changes in water source, maintenance, and even pollution, offering a surprisingly direct window into what bathers were sitting in. Poisonings Went Hand in Hand with the Drinking Water in Ancient Pompeii How Were
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