""What's the difference between a Catholic and a river that runs uphill?" She didn't know, and I told her..."
— Nero Wolfe

January 1, 1970

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Added on April 10, 2026
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Original Language: English

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Archie to Lily Rowan at lunch, "babbling," Chapter 6. The riddle was a frustration for Wolfe fans for years. Finally, Rex Stout admitted to his biographer that he had made it up and there was no answer.