NARA JOURNALJapanese Masters Get Closer to the Toilet NirvanaBy JAMES BROOKE ARA, Japan — Japan's toilet wars started in February, when Matsushita engineers here unveiled a toilet seat equipped with electrodes that send a mild electric charge through the user's buttocks, yielding a digital measurement of body-fat ratio.Unimpressed, engineers from a rival company, Inax, counterattacked in April with a toilet that glows in the dark and whirs up its lid after an infrared sensor detects a human being. When in use, the toilet plays any of six soundtracks, including chirping birds, rushing water, tinkling wind chimes, or the strumming...