(Encore episode.) Scientists have known for decades that one of the main causes of the smell of fresh rain is geosmin: a chemical compound produced by soil-dwelling bacteria. But why do the bacteria make it in the first place? Reporter Emily Vaughn answers this mystery.Read the paper on which this episode was based.Take our survey! Tell us what you love and what you would love to see more of — on our show, and also other NPR podcasts.Other scent mysteries driving your nose wild? Email the show at [email protected] and we might track down the answer.Learn more about sponsor message choices: podcastchoices.com/adchoicesNPR Privacy Policy
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