He had a wide variety of other research interests. Among these was a fascination with heterochromia, a condition in which the irises of an individual's eyes differ in coloration. Throughout his stay in Auschwitz, Mengele collected the eyes of his murdered victims, in part to furnish “research material” to colleague Karin Magnussen, a KWI researcher of eye pigmentation. He himself also conducted several experiments in an attempt to unlock the secret of artificially changing eye color. He also zealously documented in camp inmates the progression of the disease Noma, a type of gangrene which destroys the mucous membrane of the mouth and other tissues.

Victims usually arrived at the camps by freight train.[278] Almost all arrivals at the Operation Reinhard camps of Treblinka, Sobibór, and Bełżec were sent directly to the gas chambers,[279] with individuals occasionally selected to replace dead workers.[280] At Auschwitz, camp officials usually subjected individuals to selections;[281] about 25%[282] of the new arrivals were selected to work.[281] Those selected for death at all camps were told to undress and hand their valuables to camp workers.[283] They were then herded naked into the gas chambers. To prevent panic, they were told the gas chambers were showers or delousing chambers.[284] The procedure at Chełmno was slightly different. Victims there were placed in a mobile gas van and asphyxiated, while being driven to prepared burial pits in the nearby forests. There the corpses were unloaded and buried.[285]

As the war continued, the rescuers learned to adapt and work around the Nazi network of informers and collaborators. However, they were never able to develop effective strategies to combat the Nazis’ rapid organization of mass deportations and population transfers. As the war progressed, rescuers were able to identify sympathetic local groups, individuals, and organizations in every country of occupied Europe; for example, low-level clergymen, Socialists, Communists, and nationalist anti-Nazis. At all times, however, the success of Jewish rescue depended upon fate and chance.
I simply can't build up my hopes on a foundation consisting of confusion, misery and death, I see the world gradually being turned into a wilderness, I hear the ever approaching thunder, which will destroy us too, I can feel the sufferings of millions and yet, if I look up into the heavens, I think that it will all come right, that this cruelty too will end, and that peace and tranquility will return again. In the meantime, I must uphold my ideals, for perhaps the time will come when I shall be able to carry them out.
Alone and against seemingly impossible odds, Jewish men and women struck back on occasion. In April 1943, Jews in the Warsaw Ghetto staged an armed battle against SS troops lasting five weeks. In October 1943, nearly 300 Jews and Soviet POWs overpowered guards and broke out of Sobibor death camp, which was then shut down by the SS. A year later, a revolt by Jewish slave laborers at Auschwitz-Birkenau resulted in the destruction of one of the main gas chamber-crematories. Elsewhere, Jews who eluded capture became partisans, particularly in Russia, where some 30,000 Jews fought alongside the Soviets to disrupt Hitler's armies.

On January 20, 1942, Reinhard Heydrich, head of the Reich Security Head Office, convened all secretaries of state of the major German ministries to the Wannsee Conference. This conference is generally held to have been a major turning point, whereby the “final solution of the Jewish question” in Europe by “evacuation” to the East and by other “means” was decided upon. But in fact, the mass extermination of the Jews on an industrial scale, made possible by the creation of death camps, was launched prior to this notorious conference.
The pursuit resumed with a vengeance. In 1982, the agency even considered abducting a 12-year-old boy and threatening to take his life unless his father, Hans-Ulrich Rudel, a devoted Nazi and a childhood friend of Mengele’s, gave them the information that could lead to his capture. (In the end, Rudel died before the Mossad decided whether to go through with the operation.)
In 1933 Anne’s family—her father, Otto; her mother, Edith; and her older sister, Margot—moved to Amsterdam from Germany following the rise of Adolf Hitler. In 1940 the Netherlands was invaded by Germany, which began to enact various anti-Jewish measures, one of which required Anne and her sister to enroll in an all-Jewish school the following year. On June 12, 1942, Anne received a red-and-white plaid diary for her 13th birthday. That day she began writing in the book: “I hope I will be able to confide everything to you, as I have never been able to confide in anyone, and I hope you will be a great source of comfort and support.” The following month Margot received an order to report to a labour camp. Facing arrest if she did not comply, the family went into hiding on July 6, 1942, moving into a “secret annex” at Otto’s business in Amsterdam, the entrance to which was soon hidden behind a moveable bookcase. The Franks were later joined by four other Jews—Hermann and Auguste van Pels and their son, Peter, and Fritz Pfeffer—and were aided by several friends, including Miep Gies, who brought food and other supplies.

Theodor Holman wrote in reply to Sietse van der Hoek that the diary entry for 28 September 1942 proved conclusively the character's fictional origin.[citation needed] Jacqueline van Maarsen agreed,[citation needed] but Otto Frank assumed his daughter had her real acquaintance in mind when she wrote to someone of the same name.[citation needed] However, Kitty Egyedi said in an interview that she was flattered by the assumption, but doubted the diary was addressed to her:

Over the years, Zeidel’s recalcitrance melted away. In the late 1970s, he sat for interviews with Lanzmann, a few minutes of which were included in the 1985 documentary Shoah. To Lanzmann, Zeidel confided that after his escape, he was sure he stunk of death. Later Zeidel agreed to participate in the making of Out of the Forest, a 2004 Israeli documentary about the role of Lithuanian collaborators in the mass killings at Ponar.
While the Nazi Party program adopted in February 1920 did not contain direct or indirect reference to the term, Nazi propaganda presented a radical elimination of anything deemed Jewish from all aspects of German life as prerequisite for national recovery. After Hitler's rise to power, party activists and bureaucrats competed in transforming the broad-based consensus that something had to be done about the "Jewish question" into government policy aimed at varying degrees of segregation, expropriation, and physical removal. In the process, applying force became increasingly attractive; however, use of the term in German documents produced prior to 1941 should be understood less as an expression of a preconceived blueprint for genocide than as an expression of radical, as yet unspecified intent.

The British and American governments were reluctant to publicize the intelligence they had received. A BBC Hungarian Service memo, written by Carlile Macartney, a BBC broadcaster and senior Foreign Office adviser on Hungary, stated in 1942: "We shouldn't mention the Jews at all." The British government's view was that the Hungarian people's antisemitism would make them distrust the Allies if Allied broadcasts focused on the Jews.[346] The US government similarly feared turning the war into one about the Jews; antisemitism and isolationism were common in the US before its entry into the war.[347] Although governments and the German public appear to have understood what was happening, it seems the Jews themselves did not. According to Saul Friedländer, "[t]estimonies left by Jews from all over occupied Europe indicate that, in contradistinction to vast segments of surrounding society, the victims did not understand what was ultimately in store for them." In Western Europe, he writes, Jewish communities seem to have failed to piece the information together, while in Eastern Europe, they could not accept that the stories they heard from elsewhere would end up applying to them too.[348]
After this night, the German government supported dozens of laws and decrees that took away Jews property and livelihood. By the end of the year, Jews were prohibited from attending school. One billion reichsmarks of Jewish property was seized as collective punishment against the nation’s Jews for the murder of von Rath. Those able to flee the country did. In the year after Kristallnact, more than 100,000 Jews left Germany as the situation deteriorated.

Otto Frank’s own childhood, in Frankfurt, Germany, was wholly unclouded. A banker’s son, he lived untrammelled until the rise of the Nazi regime, when he was already forty-four. At nineteen, in order to acquire training in business, he went to New York with Nathan Straus, a fellow student and an heir to the Macy’s department-store fortune. During the First World War, Frank was an officer in the German military, and in 1925 he married Edith Holländer, a manufacturer’s daughter. Margot was born in 1926 and Anneliese Marie, called Anne, in 1929. His characteristically secular world view belonged to an era of quiet assimilation, or, more accurately, accommodation (which includes a modicum of deference), when German Jews had become, at least in their own minds, well integrated into German society. From birth, Otto Frank had breathed the free air of the affluent bourgeoisie.

In 1992, DNA testing confirmed Mengele's identity beyond doubt,[114] but family members refused repeated requests by Brazilian officials to repatriate the remains to Germany.[115] The skeleton is stored at the São Paulo Institute for Forensic Medicine, where it is used as an educational aid during forensic medicine courses at the University of São Paulo's medical school.[116]
Mengele's work also involved carrying out selections, a task that he chose to perform even when he was not assigned to do so, in the hope of finding subjects for his experiments,[33] with a particular interest in locating sets of twins.[34] In contrast to most of the other SS doctors, who viewed selections as one of their most stressful and unpleasant duties, he undertook the task with a flamboyant air, often smiling or whistling a tune.[35][31] He was also one of the SS doctors responsible for supervising the administration of Zyklon B, the cyanide-based pesticide that was used for the mass killings in the Birkenau gas chambers. He served in this capacity at the gas chambers located in crematoria IV and V.[36]