HARDtalk speaks to one of Africa's greatest living writers, Ngugi Wa Thiong'o.Tipped to win the Nobel prize for literature, he decided years ago not to write novels in English but in Gikuyu, his mother tongue. His work includes extraordinary memoirs of colonial times and the Mau Mau uprising in his native Kenya. How far have today's young Africans forgotten the sacrifices that brought about independence? And has that independence itself been a disappointment?