Neutrinos: " ...annus Mirabilis "

Main results and achievements of 2002-2003 in neutrino physics are summarized. The field moves quickly to new phase with clear experimental and phe-nomenological programs, and probably, with new theoretical puzzle which may lead us to discoveries of the fundamental importance. One of the main results is amazing pattern of the lepton mixing which emerges from the data. The key questions are: Does lepton mixing imply new symmetry of Nature? Is the large (maximal?) mixing related to degeneracy of the neutrino mass spectrum? In this connection priorities of the future studies are formulated. Year 2002 started by the SNO publication of the direct evidence for the solar neutrino flavor conversion 1) and finished by an announcement of the first KamLAND result 2) has been called in Ref. 3) the " annus mirabilis " of the solar neutrino physics. In 2002 the pioneering works on the detection of solar neutrinos have gotten the highest appreciation and in the same year the solar neutrino problem (which was the outcome of this detection and the driving force of developments in neutrino physics during last 35 years) has been essentially resolved. The beginning and the end have met. What happened after? What is an impact of the annus mirabilis on the field? From the scientific calendar starting 1 year back from now a : • December 4, 2002. K2K 4) : " Indication of neutrino oscillations in a 250 km long baseline experiment " .