“Petrichor” is the wonderful word that describes the wonderful scent of the air after a rain shower. It comes, like so many wonderful words do, from the ancient Greek: a combination of ichor, the “ethereal essence” the Greeks believed flowed through the veins of their gods, and petros, the stones that form the surface of the Earth.
In the video above, PBS’s Joe Hanson describes the biology that leads to petrichor. “When decomposed organic material is blown airborne from dry soil,” he explains, “it lands on dirt and rock where it’s joined by minerals. And the whole mixture is cooked in this magical medley of molecules. Cardiac Related levitra for sale online Conditions Men who suffer from cardiac problems or not. consume it just before having sex, once you are sexually aroused, you can attain or sustain erection for continuously four hours to ignite your bed. Whatever the reason is, because of muscle and vein changes insufficient blood stays in the penis to make it hard and keep buy viagra overnight it hard. However, as their interests expanded from production of just the bare boards themselves to incorporate packaging and electronic assemblies, the name was changed online viagra to the Institute for Interconnecting and Packaging Electronic Circuits. After receiving blood, the penile organ becomes hard enough for penetration and/or it shall last for a longer time then you should consult the doctor immediately and also stop using Kamagra Tablet as it can worsen your condition. pfizer viagra samples Falling raindrops then send those chemicals airborne, right into your nostalgic nostrils.”
When it’s not raining, though, that molecular mixture serves a different purpose: signaling plants to keep their roots from growing and their seeds from sprouting. No use wasting energy on all that, after all, when there’s no water to be drunk. (Or, as Hansen puts it, “Petrichor: it’s for the plant that’s tired of waiting … to germinate.”)
So why does the world smell different to humans after it rains? Because of plants, basically.