Biswanath Naru with students of his school, Nandipur Swami Vivekananda Vidyamandir in Dum Dum Park shortly after its inauguration in January.Sanat Kr Sinha Biswanath Naru sells fish for a living, but it has been 45 years that the college dropout is mastermoshai to several children of a lesser god. When the mastermoshai (teacher) began to pursue his second calling in life, all he could …