The human nose is an incredible instrument with astonishing abilities. For example, in terms of our olfactory detection threshold. There’s an odor we’ve been working with quite a bit, and its detection threshold is 10 to the power of minus 12 moles. And yet you can still smell the difference between a regular Olympic pool and an Olympic pool into which we’ve introduced a single drop of that liquid.
— "That liquid" being sweat. Read more at We base the most important decisions of our lives on smell at Haaretz.