From behind a coffee-shop window, I once saw a golden retriever leaning out of a silver Chevy pick-up. His nervous sniffing and furrowed brow told me he detected a scent that excited him, one particular smell that he couldn't get enough of.

Ultimately, it was just his own odor being blown by the wind back up into his nostrils, but how could he be expected to know that? Me, on the other hand, I'm an evolved human. I knew. I knew...