The unstoppable Allied military advance continued and on July 24, 1944, Soviet troops liberated the first camp, Majdanek in eastern Poland, where over 360,000 had died. As the Soviet Army neared Auschwitz, Himmler ordered the complete destruction of the gas chambers. Throughout Hitler's crumbling Reich, the SS now began conducting death marches of surviving concentration camp inmates away from outlying areas, including some 66,000 from Auschwitz. Most of the inmates on these marches either dropped dead from exertion or were shot by the SS when they failed to keep up with the column.
Once the Nazis took over Budapest in 1944 and began deporting Jews to the death camps, Lutz negotiated a special deal with the Hungarian government and the Nazis: he had permission to issue protective letters to 8,000 Hungarian Jews for emigration to Palestine. Lutz then deliberately misinterpreted his permission for 8,000 as applying to families rather than individuals, and proceeded to issue tens of thousands of additional protective letters, all of them bearing a number between one and 8,000. He also set up some 76 safe houses around Budapest, declaring them annexes of the Swiss legation. Among the safe houses was the now well-known "Glass House" (Üvegház) at Vadász Street 29. About 3,000 Jews found refuge at the Glass House and in a neighboring building.
What could be more "useful" than to view that era through the mind and eyes -- and in the words -- of a girl who wanted us to know who she was and what happened to her. And what could be more necessary than the story of a girl who wanted to grow up, to become a writer, to lead a full and normal life -- and was prevented from doing so, by the forces of prejudice and hatred, on a beautiful and otherwise ordinary August morning.
As the mass shootings continued in Russia, the Germans began to search for new methods of mass murder. This was driven by a need to have a more efficient method than simply shooting millions of victims. Himmler also feared that the mass shootings were causing psychological problems in the SS. His concerns were shared by his subordinates in the field.[251] In December 1939 and January 1940, another method besides shooting was tried. Experimental gas vans equipped with gas cylinders and a sealed compartment were used to kill the disabled and mentally-ill in occupied Poland.[252] Similar vans, but using the exhaust fumes rather than bottled gas, were introduced to the Chełmno extermination camp in December 1941,[253] and some were used in the occupied Soviet Union, for example in smaller clearing actions in the Minsk ghetto.[254] They also were used for murder in Yugoslavia.[255]
From the Kristallnacht pogrom onwards, Nazi policy toward the Jews radicalized relentlessly, reaching deliberate continental genocide of a kind never before seen in history by 1941-1942. It is here, however, that considerable difference of opinion among historians begins. Over the past twenty years or so, a consensus has emerged that Hitler did not embark on his campaign of killing all Jews in the Soviet Union, including women and children, immediately after the invasion began in June 1941, but only several months later. At first, it seems, only adult male Jews and “commissars” (Soviet state operatives) were killed; one of the best-known recent expositions of this viewpoint is Philippe Burrin’s 1994 Hitler and the Jews: The Genesis of the Holocaust . Nearly all of the detailed documentation of the Holocaust, including recently discovered records, points to this conclusion. Nonetheless, by the end of 1941, Nazi killing squads ( Einsatzgruppen ) had killed hundreds of thousands of Jews in the western Soviet Union, murdering men, women, and children indiscriminately. Beginning in early 1942, the extermination camps (all located in conquered Poland) began to murder Jews, and others, brought in from all parts of Europe.
By late January, roughly 80 prisoners, known to historians as the Burning Brigade, were living in the camp, in a subterranean wood-walled bunker they’d built themselves. Four were women, who washed laundry in large metal vats and prepared meals, typically a chunk of ice and dirt and potato melted down to stew. The men were divided into groups. The weaker men maintained the pyres that smoldered through the night, filling the air with the heavy smell of burning flesh. The strongest hauled bodies from the earth with bent and hooked iron poles. One prisoner, a Russian named Yuri Farber, later recalled that they could identify the year of death based on the corpse’s level of undress:
Just imagine how interesting it would be if I were to publish a romance of the "Secret Annex." The title alone would be enough to make people think it was a detective story. But, seriously, it would be quite funny 10 years after the war if we Jews were to tell how we lived and what we ate and talked about here. Although I tell you a lot, still, even so, you only know very little of our lives.
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.

——— (2015). "Is the "Final Solution" Unique?". The Third Reich in History and Memory. London: Abacus. ISBN 978-0-349-14075-9. Revised and extended from Richard Evans (2011). "Wie einzigartig war die Ermordung der Juden durch die Nationalsocialisten?" in Günter Morsch and Bertrand Perz (eds). Neue Studien zu nationalsozialistischen Massentötungen durch Giftgas: Historische Bedeutung, technische Entwicklung, revisionistische Leugnung. Berlin: Metropol Verlag, pp. 1–10. ISBN 9783940938992

^ Browning i, Christopher (2007). The Origins of the Final Solution: The Evolution of Nazi Jewish Policy, September 1939 – March 1942. U of Nebraska Press. "In a brief two years between the autumn of 1939 and the autumn of 1941, Nazi Jewish policy escalated rapidly from the pre-war policy of forced emigration to the Final Solution as it is now understood—the systematic attempt to murder every last Jew within the German grasp.
In 1935, Mengele earned a PhD in anthropology from the University of Munich.[7] In January 1937, he joined the Institute for Hereditary Biology and Racial Hygiene in Frankfurt, where he worked for Dr. Otmar Freiherr von Verschuer, a German geneticist with a particular interest in researching twins.[7] As von Verschuer's assistant, Mengele focused on the genetic factors that result in a cleft lip and palate, or a cleft chin.[10] His thesis on the subject earned him a cum laude doctorate in medicine (MD) from the University of Frankfurt in 1938.[11] (Both of his degrees were revoked by the issuing universities in the 1960s.)[12] In a letter of recommendation, von Verschuer praised Mengele's reliability and his ability to verbally present complex material in a clear manner.[13] The American author Robert Jay Lifton notes that Mengele's published works were in keeping with the scientific mainstream of the time, and would probably have been viewed as valid scientific efforts even outside Nazi Germany.[13]