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You've got these receptors in your beak (nose), and in there are millions of other receptors. Okay? So each of these smaller receptors are kind of like a shape. Remember that game where you tried to put the cube in the square and cylinder in the circle? Everything you smell is made of tiny molecules (or whatever they are, they're just some tiny sh*t) and when you breathe in these things floatin' around, certain shapes will fit into certain receptors in your nose. Okay, so now you just breathed in the scent of a fart, so here's what's happenin'. Millions of micro sized things just went into your nose and they fit into only a certain type of receptors, more of a combination of them. So once they touch their proper receptor, they trigger an electrical impulse that goes straight to a certain part of your brain (don't remember which one, I smoked a lot of weed when I was a psych student). So a rose has a certain combination of receptors they fit in, therefor the ability of perfume, even if it doesn't have actual rose in it, the perfume is able to duplicate the ability to touch the proper receptors, causing you to think of a rose. And what makes this so darn groovy is that the path the electrical signals take is supposedly the most direct of any path to the brain. So smelling has the biggest ability to be translated and accepted without being filtered. Hence, it triggering some good stuff.
Be aware of this knew knowledge. Smelling a fart now means that millions of tiny turd particles have floated into your nose. They aren't as funny anymore are they?
Oh yeah, if you want some chick to think of you and stuff, once you've got her slip on some widely used cologne after you've been seeing her for awhile. So, if you break up, everytime some other guy is wearing it, she'll smell it and think of you. Just some imature mind tricks that my Professor thought would be useful.