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Lucie Green is a Royal Society University Research Fellow, Professor of Physics at University College London.;Dr Green's latest book is entitled 15 Million Degrees: A Journey to the Centre of the Sun.
Dan talks to Frank McDonough about the resistance of Sophie Scholl, on the 75th anniversary of her execution by the Nazis.
Dan sits down with Lindiwe Mazibuko, the first non-white person to lead the Democratic Alliance in Parliament, to talk about her unique career and the values that took her into politics.
Dan talks to Macintyre about a double agent - a story clouded in deception and intrepidation.