Insights offered by a actor- growing up as a child in London of parents from Ghana and Sierra Leone- on the younger years of Nelson Mandela. Idris Alba is interviewed by Barbara Chai of the WSJ on his role in the movie "Mandela: Long Walk to Freedom." To understand his role Idris spent one night at the prison on Robben Island where Nelson Mandela spent 18 years of his life. Idris says he focussed on bringing the younger Mandela to life, not on his lines but everpresent the idea of a man setting a revolution in motion. In doing this he was bringing to life a man with all his character and flaws, a man unknown to young S. Africans, who only know the older Mandela.