By Vidya Rajan, Columnist, The Times In the fall, I spent a month in Japan. It’s an interesting country geographically, sociologically, and ecologically. Geographically, Japan is a comma-shaped stretch of some 14,125 islands to the east of the Korean peninsula. About 120 are inhabited, and five islands (Hokkaido, Honshu, Shikoku, Kyushu and the tiny southernmost island of Okinawa) host 95% of the...