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Japan's paper money incorporates some of the most advanced security features in the world, including pin-sharp watermarks, and microscopic text. This time on Japanology Plus, our theme is banknotes. Researcher Takashi Uemura, a former employee of what is now known as the National Printing Bureau, tells us why cash is still the payment method of choice for most Japanese shoppers . And in Plus One, Matt Alt learns about the elaborate envelopes that are used to gift money on special occasions.