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Wikipedia states, "The human nose is extremely sensitive to geosimin [the compound that we associate with the smell of rain], and is able to detect it at concentrations as low as 400 parts per trillion." How does that compare to other scents?

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Wikipedia states, "The human nose is extremely sensitive to geosimin [the compound that we associate with the smell of rain], and is able to detect it at concentrations as low as 400 parts per trillion." How does that compare to other scents?	4038