Isobars are atoms that have same atomic mass but different atomic number. They have different atomic numbers because they have different numbers of protons. They have the same atomic mass because they have just enough neutrons to make the same total of nucleons. Isobars occur at different places in the Periodic Table.
The Holocaust (also called Ha-Shoah in Hebrew) refers to the period from January 30, 1933 - when Adolf Hitler became chancellor of Germany - to May 8, 1945, when the war in Europe officially ended.
The German invasion of the Soviet Union in June 1941 was the start of the Holocaust as we know it. Messages reaching Churchill through his intelligence services told of the murder, in groups, of thousands of Jews. He made powerful reference to these killings when he broadcast on November 14 1941: