Eva Kor survived the sadistic pseudoscientific medical experiments carried out on twins at the Auschwitz death camp. She dedicated herself decades later to telling of the Holocaust horrors spawned by religious and racial hatred, while preaching the power of forgiveness as a means of healing from devastating trauma. Her father, mother and two older sisters, who had been separated from them upon the family’s arrival at Auschwitz, died there.

Ms. Kor took young people on annual summer tours of Auschwitz. While conducting a tour, she died on July 3 at 85 at a hotel in Krakow, Poland, near the site of the former death camp, The New York Times reported. It was there that she and her twin, Miriam, had been among some 1.500 sets of twins who were victims of experiments, including the injections of germs, overseen by the German doctor Josef Mengele. She told of Mengele’s genetics laboratory, where he had pursued the notion that studying twins could advance Hitler’s quest to produce an Aryan master race.

Her death was announced by the Candles Holocaust Museum and Education Center, which she had opened in 1995 in Terre Haute, IN. She had settled there in 1960 with her husband, Michael Kor, a fellow Holocaust survivor.