After our liberation I went to Sweden where we were looked after marvellously. The physical recovery was not as bad as the emotional and mental one, which I’m still working on. I am still touched by the memory of a doctor who taught me how to walk again, as through the malnutrition I was incapable. Such a simple thing, but he told me: “I have a daughter like you,” and how vital that statement of his was to my sense of becoming a human being again. It was amazing to be compared to someone having felt completely dehumanised for so long.
When three refugee physicists confided to Einstein that the Nazis might be developing a new weapon—an atomic bomb—he decided to act. Despite his previous appeals for governments to dispense with the weapons of war, Einstein wrote to President Franklin Roosevelt in 1939 alerting him to "a new phenomenon that would...lead to the construction of bombs" and suggested that the United States accelerate its atomic weapons research program. Scholars debate the effect of this letter. Einstein signed it in 1939 and the Manhattan Project, the U.S. effort to build the bomb, began in 1941.
The history of Auschwitz-Birkenau as an extermination center is complex. From late 1941 to October 1942, the mortuary at Auschwitz main camp, which was already equipped with a crematorium, was adapted as a gas chamber. It measured approximately 835 square feet. In the spring of 1942, two provisional gas chambers at Birkenau were constructed out of peasant huts, known as the 'bunkers'.

The camp Stos first saw, some 20 brick buildings, was a run-down former Polish artillery barrack the Nazis had taken over a few months before. Many Poles followed Stos to Auschwitz; few were as lucky. In its original incarnation as a concentration camp, Auschwitz was designed to work inmates to death. At first, most of the labor helped expand the camp itself; other work, such as gravel mining and farming, earned money for the SS. The Nazis even had a term for it, Vernichtung durch Arbeit (“Destruction through work”). The notorious SS camp supervisor Karl Fritzsch greeted new arrivals with a speech: “You have arrived here not at a sanatorium, but at a German concentration camp, from which the only exit is through the chimney of its crematorium.”
In 1931, Himmler organised an SS intelligence service which became known as the Sicherheitsdienst (SD; Security Service) under his deputy, Heydrich.[246] This organisation was tasked with locating and arresting communists and other political opponents.[247][248] Himmler established the beginnings of a parallel economy under the auspices of the SS Economy and Administration Head Office. This holding company owned housing corporations, factories, and publishing houses.[249][250]
On 26 June 1933, Himmler appointed Theodor Eicke commandant of Dachau, who in 1934 was also appointed the first Inspector of Concentration Camps (CCI). In addition, the remaining SA-run camps were taken over by the SS.[14][15][16] Dachau served as both a prototype and a model for the other Nazi concentration camps. Almost every community in Germany had members who were taken there. The newspapers continuously reported on "the removal of the enemies of the Reich to concentration camps" making the general population more aware of their presence. There were jingles warning as early as 1935: "Dear God, make me dumb, that I may not come to Dachau."[17]
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