The Science of Petrichor: Why India's First Rain Smells Divine

That 'mitti ki khushbu' is petrichor — a name coined by scientists in 1964 from Greek for 'stone' and 'gods' blood'.

The earthy core is geosmin, made by soil bacteria Streptomyces; humans smell it at a few parts per trillion.

Rain releases it via tiny aerosols: drops trap air bubbles that burst and fling scent into the air.

Kannauj in UP distils baked clay into 'mitti attar' — a real perfume that bottles the smell of first rain.

We're freakishly sensitive to geosmin likely because, for our ancestors, it meant water was near.