The most notorious physician was Josef Mengele, an SS officer who became the Auschwitz camp doctor on 30 May 1943.[54] Interested in genetics[54] and keen to experiment on twins, he would pick out subjects from the new arrivals during "selection" on the ramp, shouting "Zwillinge heraus!" (twins step forward!).[55] They would be measured, killed, and dissected. One of Mengele's assistants said in 1946 that he was told to send organs of interest to the directors of the "Anthropological Institute in Berlin-Dahlem". This is thought to refer to Mengele's academic supervisor, Otmar Freiherr von Verschuer , director from October 1942 of the Kaiser Wilhelm Institute of Anthropology, Human Heredity, and Eugenics in Berlin-Dahlem.[56][55][i] Mengele's experiments included placing subjects in pressure chambers, testing drugs on them, freezing them, attempting to change their eye color by injecting chemicals into children's eyes, and amputations and other surgeries.[59]
Before the start of World War II, around 9.5 million Jewish people lived in Europe. By the time the war ended, the Nazis had killed 6 million European Jews in concentration camps, or pogroms, or ghettos, or mass executions in what we refer to today as the Holocaust. The Nazis used the term Endlösung, or Final Solution, as the “answer” to the “Jewish question.” But when did this monstrous plan get put in motion?
^ Jump up to: a b Eberhard Jäckel (Die Zeit, 1986): "Ich behaupte ... daß der nationalsozialistische Mord an den Juden deswegen einzigartig war, weil noch nie zuvor ein Staat mit der Autorität seines verantwortlichen Führers beschlossen und angekündigt hatte, eine bestimmte Menschengruppe einschließlich der Alten, der Frauen, der Kinder und der Säuglinge möglichst restlos zu töten, und diesen Beschluß mit allen nur möglichen staatlichen Machtmitteln in die Tat umsetzte." ("I maintain ... that the National Socialist killing of the Jews was unique in that never before had a state with the authority of its leader decided and announced that a specific group of humans, including the elderly, the women, the children and the infants, would be killed as quickly as possible, and then carried out this resolution using every possible means of state power.")[35]
Who among gentile Poles was most likely to stand up for persecuted Jews? What propelled these rescuers to risk their lives for them? What characteristics, motivations, and circumstances did the rescuers share? Most attempts to answer these questions focus upon standard sociological categories: researchers consider the rescuers’ class, education, political and religious commitments, friendships with Jews, and level of anti-Jewish prejudice. The results of such investigations have not led to clear conclusions. Some studies suggest that economically deprived Christians more readily identified with Jewish suffering. Others conclude that intellectuals were more likely to have been protectors because they had better insight into German aims and were committed to undermining them.
The following proclamation was issued by Dr. Ludwig Fischer, the German district governor of Warsaw, on November 10, 1941: "Concerning the Death Penalty for Illegally Leaving Jewish Residental Districts...Any Jew who illegally leaves the designated residential district will be punished by death. Anyone who deliberately offers refuge to such Jews or who aids them in any other manner (i.e., offering a night's lodging, food, or by taking them into vehicles of any kind, etc.) will be subject to the same punishment. Judgment will be rendered by a Special Court in Warsaw. I forcefully draw the attention of the entire population of the Warsaw District to this new decree, as henceforth it will be applied with the utmost severity."
In the manuscript, her original diaries are written over three extant volumes. The first volume (the red-and-white checkered autograph book) covers the period between June 14 and December 5, 1942. Since the second surviving volume (a school exercise book) begins on December 22, 1943, and ends on April 17, 1944, it is assumed that the original volume or volumes between December 1942 and December 1943 were lost - presumably after the arrest, when the hiding place was emptied on Nazi instructions. However, this missing period is covered in the version Anne rewrote for preservation. The third existing volume (which was also a school exercise book) contains entries from April 17 to August 1, 1944, when Anne wrote for the last time before her arrest.[16]:2
During the Nazi occupation of the Netherlands, Anne Frank received a blank diary as one of her presents on June 12, 1942, her 13th birthday.[8][9] According to the Anne Frank House, the red, checkered autograph book which Anne used as her diary was actually not a surprise, since she had chosen it the day before with her father when browsing a bookstore near her home.[9] She began to write in it on June 14, 1942, two days later.[10][11]
Systematic examinations of rescuers have actually shown a high degree of heterogeneity among individuals. Rescuers came from divergent social backgrounds, varied widely in terms of political and religious involvements, and displayed different levels of friendship and animosity toward Jews. None of these variables has turned out to be a reliable predictor of the sort of person who was more or less likely to rescue Jews.

The ideology of Nazism brought together elements of antisemitism, racial hygiene, and eugenics, and combined them with pan-Germanism and territorial expansionism with the goal of obtaining more Lebensraum (living space) for the Germanic people.[16] Nazi Germany attempted to obtain this new territory by attacking Poland and the Soviet Union, intending to deport or kill the Jews and Slavs living there, who were considered by the Nazis to be inferior to the Aryan master race.[17]