"It's not the picture of Vivekananda that people have but he was extremely funny. He tried not to be too hard on the Americans so he did a lot with humour and teasing" - Ruth Harris, author, Guru to the World; The Life and Legacy of Vivekananda talks to Manjula Narayan about the connections Vivekananda forged in Europe and America, his guru Ramakrishna, the contribution of his disciple Sister Nivedita, and his own radicalism and rejection of orthodoxy.