Stephen Sackur speaks to Tova Friedman, one of the youngest survivors of Auschwitz. Never has it felt more important to remember the lessons of one of history’s greatest crimes, the Nazi genocide of the Jews. Europe is again witnessing a war of aggression, anti-Semitism is on the rise in many countries, and surveys of young people reveal alarming ignorance of the Holocaust. Now in her eighties, Tova Friedman has written a memoir and taken to social media to tell her story. Is the world listening?