Evidence for neutrino mass leads to Kamiokande-II

The observations of solar neutrino deficit and atmospheric neutrino anomaly opened up a new vista of neutrino physics, and encouraged new experiments such as Super-Kamiokande, SNO, K2K, KamLAND and so on. Kamiokande-II played key roles to establish these two anomalies. This is the reason for the title of this article.