Smell is such an odd sense. For example, I found this part amazing:
> It is understood that certain chemicals block certain receptors, occupying their binding sites such that no other volatile molecules can reach them. These antagonists might have smells of their own—they activate other receptors—but, in principle, they will dampen or eliminate the smells that depend on the receptors they block. Such aromachemicals could be used not simply to cover up the stink of a latrine, but, in essence, to prevent it from being smelled at all.
> It is understood that certain chemicals block certain receptors, occupying their binding sites such that no other volatile molecules can reach them. These antagonists might have smells of their own—they activate other receptors—but, in principle, they will dampen or eliminate the smells that depend on the receptors they block. Such aromachemicals could be used not simply to cover up the stink of a latrine, but, in essence, to prevent it from being smelled at all.