The smell of the air after a storm is caused by Geosmin: a chemical released by dead soil bacteria. Humans are sensitive to it, capable of detecting concentrations ~5 parts per trillion. It's theorised in our evolutionary past this helped us seek out water https://t.co/ssYs59LklV pic.twitter.com/7kgN2mi7MD
— Massimo (@Rainmaker1973) August 12, 2023
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