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Saturday 28 July 2018

The smell of the air after a storm is caused by Geosmin

James Wong ‏ @Botanygeek 20h20 hours ago More The smell of the air after a storm is caused by Geosmin: A chemical released by dead soil bacteria. Humans are hyper sensitive to it, capable of detecting at a concentration of 5 parts per trillion. It's theorised in our evolutionary past this helped us seek out water.