You probably think you already know everything you need to know about chocolate.

For instance: The higher the percentage of cacao, the more bitter the chocolate, right? The term “single origin” on the label indicates that the chocolate expresses a particular terroir. And wasn’t the whole bean-to-bar movement started by a couple of bearded guys in Brooklyn?

Wrong; not necessarily; and definitely not.

Americans spend $21 billion on chocolate every year, but just because we eat a lot of it doesn’t mean we know what we’re eating. And misunderstandings at the store can make it especially hard for chocolate lovers to figure out which of the myriad, jauntily wrapped bars crowding the shelves are the best to buy, in terms of both taste and ethics.