Happy 135th Birthday, Albert Einstein! (also, Pi Day!)
Theoretical physicist Albert Einstein was born on March 14, 1879, in Ulm Germany. He entered the United States in June of 1935 and filed this declaration of intent to become a citizen in January of 1936. He would become a U.S. citizen in 1940.
In 1939 he collaborated with fellow physicist Leo Szilard on a letter regarding advances in nuclear research to President Franklin Roosevelt, which would ultimately lead to the development of the Manhattan Project. During World War II, he also worked as a part-time Federal employee developing underwater weapons for the U.S. Navy. Some of his correspondence from this work is available in our online catalog.
In 1948 he appeared in this instructional film “Atomic Physics,” explaining how the work of other scientists featured in the film illustrated his theory of equivalence of mass and energy.
Source: research.archives.gov
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