Howard P Arnold was 8 years old when Albert Einstein publishes his first paper on the special theory of relativity. Albert Einstein was a German-born theoretical physicist who developed the theory of relativity, one of the two pillars of modern physics. His work is also known for its influence on the philosophy of science. He is best known to the general public for his mass–energy equivalence formula E = mc2, which has been dubbed "the world's most famous equation". He received the 1921 Nobel Prize in Physics "for his services to theoretical physics, and especially for his discovery of the law of the photoelectric effect", a pivotal step in the development of quantum theory.
Howard P Arnold was 17 years old when Archduke Franz Ferdinand and his wife, Sophie, Duchess of Hohenberg, were assassinated by a Yugoslav nationalist named Gavrilo Princip in Sarajevo, sparking the outbreak of World War I. Archduke Franz Ferdinand, Archduke of Austria-Este was a member of the imperial Habsburg dynasty, and from 1896 until his death the heir presumptive (Thronfolger) to the Austro-Hungarian throne. His assassination in Sarajevo precipitated Austria-Hungary's declaration of war against Serbia, which in turn triggered a series of events that resulted in Austria-Hungary's allies and Serbia's declaring war on each other, starting World War I.
Howard P Arnold was 30 years old when Walt Disney character Mickey Mouse premieres in his first cartoon, "Plane Crazy". Walter Elias Disney was an American entrepreneur, animator, voice actor and film producer. A pioneer of the American animation industry, he introduced several developments in the production of cartoons. As a film producer, Disney holds the record for most Academy Awards earned by an individual, having won 22 Oscars from 59 nominations. He was presented with two Golden Globe Special Achievement Awards and an Emmy Award, among other honors. Several of his films are included in the National Film Registry by the Library of Congress.
Howard P Arnold was 42 years old when Adolf Hitler signs an order to begin the systematic euthanasia of mentally ill and disabled people. Adolf Hitler was a German politician, demagogue, and Pan-German revolutionary, who was the leader of the Nazi Party, Chancellor of Germany from 1933 to 1945 and Führer ("Leader") of Nazi Germany from 1934 to 1945. As dictator, Hitler initiated World War II in Europe with the invasion of Poland in September 1939, and was central to the Holocaust.
Howard P Arnold was 44 years old when World War II: Nazi Germany invades the Soviet Union in Operation Barbarossa. Nazi Germany is the common English name for Germany between 1933 and 1945, when Adolf Hitler and his Nazi Party (NSDAP) controlled the country through a dictatorship. Under Hitler's rule, Germany was transformed into a totalitarian state that controlled nearly all aspects of life via the Gleichschaltung legal process. The official name of the state was Deutsches Reich until 1943 and Großdeutsches Reich from 1943 to 1945. Nazi Germany is also known as the Third Reich, from German Drittes Reich, meaning "Third Realm" or "Third Empire", the first two being the Holy Roman Empire and the German Empire. The Nazi regime ended after the Allied Powers defeated Germany in May 1945, ending World War II in Europe.
Howard P Arnold died on 7 Jan 1953 at the age of 55