Palestinians walk among the ruins of the Great Omari Mosque, damaged during the Israeli-Hamas conflict, during a ceasefire, in the Old City of Gaza. Photograph: Mohammed Saber/EPA Just over 80 years ago, on January 27th, 1945, the Red Army – advancing from the Eastern Front and pushing German forces out of Soviet territory – arrived at the gates of Auschwitz-Birkenau concentration camp in Poland. To their horror, they found mounds of frozen corpses and 7,000 skeletal prisoners – frightened, exhausted and demented. The soldiers had stumbled on a concentration camp where, using gas chambers and crematoriums, more than a million...