Albert and Elsa Einstein, c. 1920s


Albert Einstein and his second wife Elsa, whom he married in 1919. Elsa Einstein (January 18, 1876 - December 20, 1936) was the second wife of Albert Einstein. Elsa had the surname of Einstein at birth, lost it when she took the name of her first husband Max L̦wenthal, and regained it in 1919 when she married her cousin Albert. Albert Einstein (March 14, 1879 - April 18, 1955) was a German-born theoretical physicist who developed the general theory of relativity, effecting a revolution in physics. Einstein is often regarded as the father of modern physics and the most influential physicist of the 20th century. While best known for his mass-energy equivalence formula E = mc2, 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. The latter was pivotal in establishing quantum theory within physics.


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