Here’s the lesson I learned from this exercise: In just three or four hours of work, I completed a personal project that allowed me to see the evidence supporting Matt Ridley’s discussion on the evolution of fertility. His hypotheses seem to have some basis after all. But if you don’t present your data to readers so they can see it, read it, explore it, and analyze it, why would they trust you? This is a question many journalists, particularly those who write opinion columns, should ask themselves more often.