Twins! Twins! Ten-year-old Eva Mozes clung to her mother amidst the chaos of the selection platform at Auschwitz-Birkenau. Before arriving at the death camp, she had been stuffed into a train car on a seemingly endless journey from Hungary. Now, she and her twin sister Miriam pressed close as Nazi guards shouted orders in German.
Suddenly, an SS guard stopped in front of the identical girls. Are they twins? he asked their mother.
Is that good? she replied.
He nodded, and Eva Mozess life changed forever.The SS guard grabbed her and Miriam, whisking them away from their mother as they screamed and called her name. They never saw her again.
Eva and Miriam had just become subjects of a massive, inhumane medical experimentation program at Auschwitz-Birkenaua program aimed solely at thousands of twins, many of them children.
A group of child survivors behind a barbed wire fence at Auschwitz-Birkenau, on the day of the camps liberation on January 27, 1945. Twins Eva and Miriam Mozes are pictured on the far right.
Alexander Vorontsov/Galerie Bilderwelt/Getty Images
Led by physician Josef Mengele, the program turned twins like Eva and Miriam into unwilling medical subjects in experiments that exposed about 3,000 children atAuschwitz-Birkenauto disease, disfigurement and torture under the guise of medical research into illness, human endurance and more.
Twins were separated from the other prisoners during the massive selections that took place at the camps massive train platform, and whisked off to a laboratory to be examined. Mengele usually used one twin as a control and subjected the other to everything from blood transfusions to forced insemination, injections with diseases, amputations, and murder. Those that died were dissected and studied; their surviving twins were killed and subjected to the same scrutiny.
READ MORE:How the Nazis Tried to Cover Up Their Crimes at Auschwitz
Twin studies had helped scientists like Mengeles mentor justify what they saw as necessary discrimination against people with undesirable genetic characteristicsJews, Roma people, LGBTQ people, people with disabilities and others. But the twin experiments that had helped create the eugenics movement would, ironically, lead to the downfall of eugenics itself.
For eugenicists like Mengele, identical twins like the Mozes sisters were the perfect research subjects. Since they share a genome, scientists reasoned, any physical or behavioral differences in twins would be due to behavior, not genetics. Eugenicists held genetics responsible for undesirable characteristics and social conditions like criminality and poverty. They believed that selective breeding could be used to encourage socially acceptable behavior and wipe out undesirable tendencies.
Eva Mozes Kor attending a ceremony to mark the 60th anniversary of the liberation of Auschwitz. She is holding a photograph of herself and her twin sister Miriam taken by the Soviets after the liberation of the camp.
Bjoern Steinz/Panos Pictures/Redux
By the time twin research began at Auschwitz-Birkenau in the 1940s, the use of twins in scientific experimentation was decades old. Though prior twin experiments had produced growing evidence that environment was as important as genetics, eugenics researchers clung to the idea that they could unlock new insights into nature and nurture through studying them.
One of them, Otmar von Verschuer, had significant power and influence in Nazi Germany. He authored texts that influenced Nazi policies toward Jews, Roma people and others, arguing that race had a biological basis and that inferior people could taint the Aryan race. An advocate for forced sterilization and selective breeding, von Verschuer collected genetic information on large numbers of twins, studying the statistics in an attempt to determine whether everything from disease to criminal behavior could be inherited. And he had a protege: a young physician named Josef Mengele.
Like his mentor, Mengele was vehemently racist and a devoted member of the Nazi Party. In 1943, he began working at Auschwitz-Birkenau as a medical officer. At first, Mengele was in charge of the Roma camp there, but in 1944 the entire remaining population of the camp was murdered in the gas chambers. Mengele was promoted to chief camp physician of the entire Birkenau camp, and became known for his brutal selections of incoming prisoners for the gas chambers.
READ MORE:This Midwife at Auschwitz Delivered 3,000 Babies in Unfathomable Conditions
Mengele wanted to continue the twin experiments he had begun withvon Verschuer, and now he had a captive populace on which to do so. Though his earlier experiments had been legitimate, his work in Auschwitz-Birkenau was not. Abandoning medical ethics and research protocols, Mengele began conducting horrific experiments on up to 1,500 sets of twins, many of them children.
German Nazi doctor and war criminal Josef Mengele.
Hulton Archive/Getty Images
The Mengele Twins received nominal protection from some of the ravages of life at Auschwitz-Birkenau. They were not selected for the gas chambers, lived in separate quarters, and were given additional food and medical care. In exchange, though, they became the unwilling subjects of inhumane experiments at the hands of Mengele, who gained a reputation as the Angel of Death for his power, his mercurial temper and his cruelty.
For Eva, life as a Mengele twin meant sitting naked for hours and having her body repeatedly measured and compared to Miriams. She withstood injections of an unknown substance that caused severe reactions. As twins, I knew that we were unique because we were never permitted to interact with anybody in other parts of the camp, she later recalled. But I didn't know I was being used in genetic experiments.
Eugenics itself was rooted in twin research. Frances Galton, a British scientist who coined the term eugenics in 1883, had used twin studies in his earliest eugenic research.Deeply influenced by his half-cousin Charles Darwins book The Origin of Species, Galton became intrigued by how and whether humans passed along traits like intelligence, and preoccupied with the potential of breeding desirable genetic traits into humans.
For Galton and other eugenics researchers, twins held the key to understanding which characteristics were genetic and which ones were environmental. Using data collected via self-reported questionnaires, Galton studied dozens of pairs of twins to determine how they were similar and different. He concluded that similarities between twins were due to their genetics. The one element that varies in different individuals, but is constant in each of them, is the natural tendency, he wrote. It inevitably asserts itself.
Though Galtons twin research was biased and seriously flawed by modern standards, it helped lay the foundation for the eugenics movement. It also convinced other eugenicists that twins were the ideal way to study nature and nurture. But though eugenicists hypothesized that twins could help them create more perfect humans, the results of twin experiments kept confounding scientists. In the 1930s, for example, a group of American researchers who compared twins found a large variance in IQ in twins who had been raised apart but nonetheless shared similar personalities and behavioral traits.
Though twins were the most favorable weapons for the study of the much-debated nature-nurture problem, they wrote, their conclusions suggested that the very qualities eugenicists thought they could encourage by monitoring marriage and eliminating individuals with undesirable traits from the gene pool didnt have to do with genetics at all.
The Nazis defeat ended Mengeles experimentation on twins at Auschwitz. At the end of the war, the Angel of Death" managed to escape prosecution. Shielded by Nazi sympathizers, he lived in South America until his death in Brazil in 1979.
READ MORE:The 7 Most Notorious Nazis Who Escaped to South America
In the aftermath of the war, scientists grappled with the aftermath of Nazi experimentation and the Holocausts use of eugenic principles in the name of genocide. In 1946, a group of German physicians who had carried out euthanasia and conducted medical experimentation in Nazi death camps were tried at Nuremberg during a 140-day-long trial. The trial resulted in seven death sentences and the Nuremberg Code, a set of research ethics that has influenced modern concepts of informed consent and medical experimentation.
Only 200 of the 3,000 twins subjected to medical experiments at Auschwitz survived. Among them were Eva and Miriam. In the 1970s, Eva Mozes Kor began lecturing about her experiences and seeking out other survivors. Eventually, she and Miriam formed a nonprofit called Children of Auschwitz Nazi Deadly Lab Experiments Survivors (CANDLES) and tracked down more than 100 other twin survivors, documenting their experiences and the health ramifications of the often unknown experiments they had been subjected to at Auschwitz.
Most records of experimentation at Auschwitz were destroyed, but the lives of people like Eva Mozes Kor, who died in July 2019 at age 85, bear witness to the twin experiments brutality. Ironically, the very type of experimentation Nazi physicians thought would uphold the pseudoscience they used to justify genocide ended up undermining the field of eugenics. In the face of unconvincing data revealed by twin studies and worldwide condemnation of Nazi medical experiments, scientists abandoned eugenics en masse and the field died out.
Today, the concept of twin studies has been challenged by research that demonstrates genetic variations even among identical twins. Buttwin studies are still used to learn more aboutage-related disease, eating disorders, sexual orientation and more, while a groundbreaking study of twin NASA astronauts is shedding new light on how microgravity affects the human body. But though twins remain invaluable to researchers today, twin studies are still a subject of debate among scientists eager to sidestep their hideous history.
READ MORE: The Jewish Men Forced to Help Run Auschwitz
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