ABSTRACT
The three papers included in this section have been described in the Preface to the paperback edition of 2002. We only need to add here that the announcement of the epochal results from the SNO experiment (VI. 3) on June 18, 2001 immediately led to a torrent of papers that used the SNO results, together with those of the Super-Kamiokande collaboration (VI. 2) and the previously announced results from the chlorine, Kamiokande, SAGE, GALLEX, and GNO experiments, to elucidate the importance of the experimental results for physics and astronomy.
