Overview: This week, "journeys in japan" visits a city of science—Tsukuba in Ibaraki Prefecture, at the foot of Mt. Tsukuba. In 1963, under a national policy, the city was opened up as a place for research on advanced technology. It's now home to 300 research institutes. Our reporter Judit Kawaguchi discovers the charms of the city and its state-of-the-art technology. (Excerpt)