From a scientific or statistical standpoint, it seems ridiculous to think one data point can teach us much. Even a study with ten data points is laughably small. It's also really common to see people over-react to a single experience they've had (e.g., "I know I don't like Taiwanese food because I tried it once") or to an anecdote (e.g., "I'm convinced this supplement will work because my friend took it and says it worked"). And yet, in some contexts, one data point can teach us a LOT. He...