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A curious series of hieroglyphics appears in the first pages of the classic 1984 textbook, Lectures on Macroeconomics. Recently experts decoded the symbols and were surprised to find a poem. NPR’s Scott Simon speaks with the book’s co-author, Olivier Blanchard, and his daughter, Serena. Ms. Blanchard was just 8 years old when she wrote the verse that has puzzled economics students for generations.