Tapasa vai Ganga  Tapasa vai Ganga ("Ganga was brought to the earth only by Tapa ie penance" meaning which a great task can only be achieved by Tapa or Penance) is the biography of Radha Krishna Choudhary, an eminent historian and littérateur of Mithila, written by dr. Binod Bihari Verma, published in 1995. This biography, contains two parts in the same volume. The first part deals with the sequence of life of Prof Radha Krishna Choudhary, and the second part deals with the analysis of his thinking, creative and academic works.