Fortune #26

During the Crimean War, Florence Nightingale saw many soldiers die in hospitals. It was easy to assume that battlefield wounds were the main cause. When she collected and analyzed the evidence, however, it showed that disease and unsanitary conditions killed more soldiers than combat injuries.

Nightingale did not leave the finding in difficult tables. She used polar-area diagrams and extensive reports to communicate with people in power, turning scattered numbers into a pattern that was hard to dismiss. The evidence supported hospital and public-health reforms intended to prevent the mistakes of the two-year war from recurring.

Fairness began with refusing to let an assumption decide the cause before evidence. Nightingale already possessed strong convictions, but she still allowed the numbers to locate the actual problem. Checking a source is therefore not pointless delay. It directs limited effort toward a cause rather than a guess.

Before believing or forwarding a claim, ask who produced the information, how it was gathered, and whether another explanation fits. If it concerns a person, ask them when possible. You need not become a statistician. Simply preserve a space between what you hear and what you conclude. That space is where truth can enter.