blogs.smithsonianmag.com -- Archaeologists often talk about the importance of trash—you can learn a lot about a culture by looking at what it threw away. Chemists may say the same thing about another kind of waste: sewage. Throughout last year, researchers at the Norwegian Institute for Water Research monitored the illegal drug habits of half a million people in Oslo by chemically sifting through the sewers. The work is an example of the emerging field of “sewage epidemiology.”
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