Shopping for "good" chocolate is kind of like searching for a viable online date. Approach the market without a plan and it's easy to get duped by glossy packaging and false claims. Know what you're looking for, though, and you can find yourself a sweetie with substance.
You've probably read that chocolate affects your brain by causing the release of the "happiness neurotransmitters" -- serotonin, dopamine, and endorphins. But experienced chocolate hackers also know chocolate is a useful tool for improving performance in lesser-known ways.