Ten years ago, you could have traveled thousands of miles through the United States and never seen a baseball cap turned back to front. Today, the re… - Richard Dawkins

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Ten years ago, you could have traveled thousands of miles through the United States and never seen a baseball cap turned back to front. Today, the reverse baseball cap is ubiquitous. I do not know what the pattern of geographical spread of the reverse baseball cap precisely was, but epidemiology is certainly among the professions primarily qualified to study it.