Jerusalem’s Yad Vashem centre has amassed a collection of items from Holocaust victims or survivors. A painting using an eggshell background by Jacques Gotko shows the camp where he was kept. Photograph: Amit Elkayam/New York Times In a few years’ time there will be no living witnesses to recount their experiences of the Holocaust, the greatest tragedy in Jewish history, during which some six million Jews were murdered by the Nazis and their collaborators. The average age of the roughly 119,000 Holocaust survivors living in Israel, just under half of the world’s total, is already over 85 and the vast...