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Toilets in Japan date back 2,000 years. A modern one typically features a heated seat and electronic bidet. Recent trends include new toilets for the elderly and infirm, and for use after a disaster. Our expert guest, architect Shiohiko Takahashi, is a leading researcher and designer of toilets who has surveyed public toilets throughout Japan. This time on Japanology Plus, we'll see how the Japanese relate to an essential everyday item . And in Plus One, a look at state-of-the-art public toilets.