When those first fat drops of summer rain fall to the hot, dry ground, have you ever noticed a distinctive odor? I have childhood memories of family members who were farmers describing how they could always “smell rain” right before a storm. Of course rain itself has no scent. But moments before a rain event, an “earthy” smell known as petrichor does permeate the air. People call it musky, fresh – generally pleasant. This smell actually comes from the moistening of the ground. Australian scientists first documented the process of petrichor formation in 1964 and scientists from the Massachusetts Institute…

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