“It happened, so it can happen again…” This is the caution that chemist, writer, and Auschwitz survivor Primo Levi pronounced for all humankind to heed. When after the war he was released from the concentration camp in which he was held both for being a Jew and fighting fascism in Italy, he was unrecognisable. His face was bloated with malnutrition, his body reduced to a skeleton. For the 40 remaining years of his life, he battled the demons of his memories of the death camp. When, 79 years after its liberation, I walked through Auschwitz, it was fitting that the...