Monthly Archives: May 2013

That rain that smells so good

Because these bacteria thrive in wet conditions and produce spores during dry spells, the smell of geosmin is often most pronounced when it rains for the first time in a while, because the largest supply of spores has collected in the soil. Studies have revealed that the human nose is extremely sensitive to geosmin in particular—some people can detect it at concentrations as low as 5 parts per trillion. Coincidentally, it’s also responsible for the distinctively earthy taste in beets.

via What Makes Rain Smell So Good? | Surprising Science.