engaged in systematic murder of Polish scholars, teachers and priests. Millions of books were burned, including an estimated 80% of all school libraries, and three-quarters of all scientific libraries. Polish children were forbidden from acquiring education beyond the elementary level with the aim that the new generation of Polish leaders could not arise in the future. According to a May 1940 memo from Heinrich Himmler: "The sole goal of this schooling is to teach them simple arithmetic, nothing above the number 500; writing one's name; and the doctrine that it is divine law to obey the Germans. I do not think that reading is desirable." By 1941, the number of children attending elementary school in the General Government was half of the pre-war number. The Poles responded with Tajne Nauczanie, the "Secret Teaching" a campaign of underground education. Indiscriminate executions Ethnic Poles in Poland were targeted by the łapanka policy which German forces utilized to indiscriminately round up civilians off the street. In Warsaw, between 1942 and 1944, there were approximately 400 daily victims of łapanka. It is estimated that tens of thousands of these victims were murdered in mass executions, including an estimated 37,000 people at the Pawiak prison complex run by the Gestapo, and thousands of others murdered in the ruins of the Warsaw Ghetto. Extermination of hospital patients In July 1939, a Nazi secret program called Action T4 was implemented whose purpose was to effect the extermination of psychiatric patients. During the German invasion of Poland, the program was put into practice on a massive scale in the occupied Polish territories. Typically, all patients, accompanied by soldiers from special SS detachments, were transported by trucks to the extermination sites. The first actions of this type took place at a large psychiatric hospital in Kocborowo on 22 September 1939 (Gdańsk region), as well as in Gniezno and in Kościan. The total number of psychiatric patients murdered by the Nazis in occupied Poland between 1939 and 1945 is estimated to be more than 16,000. An additional 10,000 patients were murdered by starvation. Approximately 100 of the 243 members of the Polish Psychiatric Association met the same fate as their patients. Execution of patients by firing squad and by revolver included 400 patients of a psychiatric hospital in Chełm on 1 February 1940 and from Owińska. In Pomerania, they were transported to a military fortress in Poznań and gassed with