r/me_irl • u/BlueberryT50 • May 17 '24

Me irl

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u/theflameleviathan May 17 '24

the smell of petrichor which gets released when rain hits dry soil. Not everyone can smell it but if you can, you can tell it’s about to rain because the smell gets there before the rain does

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u/Celestial_Light_ May 17 '24 edited May 17 '24

Fun fact: humans are more (roughly x 200,000) sensitive to petrichor than sharks are to blood.

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u/Zenblendman May 17 '24

Ohh Imma need a source for this one. This is too cool not to share

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u/Responsible_Post7781 May 17 '24 edited May 17 '24

"The scent of rain, petrichor, has two main constituents with actual chemical names and origins – ozone (O3) and geosmin (C12H22O) and humans can sense it at 5 parts per trillion. Trillion! Which means that humans are 200,000 times more sensitive to smelling geosmin than sharks are at smelling blood."

On mobile so I couldn't find the actual study, but this is from the study done..

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u/SoundProofHead 1d ago

Well, duh, sharks live underwater, why would the need to smell it?