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Why did Nazi doctors carry out experiments on twins at Auschwitz?

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Auschwitz: entrance gates — Auschwitz The entrance gates to the Auschwitz concentration camp, near Kraków, Poland; the sign reads “Arbeit Macht Frei” (“Work Liberates”).

At the Auschwitz concentration camp, Nazi doctors—most notably Josef Mengele—conducted medical experiments on twins as part of pseudoscientific racial studies. These experiments were driven by the goal of gathering data that the Nazis believed would facilitate the rapid expansion of the "Aryan race."12

Mengele, who served as the chief doctor at the Birkenau extermination camp, held a particular interest in twin research. These experiments were profoundly unethical and barbaric, often resulting in the death of the subjects, upon whom autopsies were subsequently performed to further the Nazis' distorted and inhumane racial objectives. The use of human beings as involuntary subjects for such purposes represents a fundamental violation of human rights and ethical principles.12