Meet the American spies who helped mammograms save more lives

 Mammograms don’t command much attention until the yearly appointment rolls around. My wife faces the hassle of the exam alone, of course, but we worry together until the results come back. Like any other cancer test—hello there, prostate—the technology leaves us feeling thankful but not exactly thrilled. It’s just one of those preventive-care indignities of middle age that have become routine.

So I was taken aback when a retired CIA officer I know recently told me a fascinating fact...