Albert Einstein is one of the top ten outstanding physicists in the world, a pioneer, master and founder of modern physics, and a famous thinker and philosopher. Einstein graduated from the Federal Institute of Technology in Zurich in 1900 and became a Swiss citizen. 1905 received a doctorate in philosophy from the University of Zurich. He worked in Berne Patent Office and served as a university professor at Zurich University of Technology and Prague, Germany. 19 13 returned to Germany, served as the director of the Institute of Physics of Emperor William in Berlin, a professor at Humboldt University in Berlin, and was elected as an academician of the Prussian Academy of Sciences. 1933 persecuted by Nazi regime, moved to the United States, became a professor at Princeton Institute for Advanced Studies, engaged in theoretical physics research, 1940 became an American citizen. There is a well-known proverb: "Everything is relative." But Einstein's theory is not a repetition of this philosophical cliche, but an accurate mathematical expression. In this method, scientific measurement is relative. Obviously, the subjective feeling of time and space depends on the observer himself. When Einstein was a child, one day the German imperial army passed through the streets of Munich, and curious people flocked to the window to cheer. The children longed for the soldiers' shining helmets and neat steps, but Einstein hid in fear. He despised and feared these "monsters in war" and asked his mother to take him to the country, where he would never be such a monster. In middle school, Einstein gave up German citizenship, but did not apply for Italian citizenship. He wants to be an independent citizen of the world ... After World War II, Einstein tried to build his dream of world peace on the basis of reality and delivered a series of "peace" speeches in "enemy countries". His thoughts and actions led to his death: a Russian aristocratic female assassin with imperialist ambitions secretly pointed the gun at him; Albert Einstein's name also appeared on the blacklist of German right-wing assassins; Hitler offered a reward of twenty thousand marks for his head. In order to keep himself in harmony with the world, Einstein had to move from Italy to the Netherlands and from the Netherlands to the United States. He became an American citizen. He believes that in the United States, people from all walks of life can survive in a barely passable friendship. (Excerpted from Einstein's Reflection, No.5-6, Academic Monthly of Applied Writing 1985)