The opera “Parsifal” by Richard Wagner premiered in Bayreuth, Germany.
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Albert Einstein's theory of gravitational redshift was proven after a telescope in Chile observed a black hole.
As part of the War of the Roses in England, the Battle of Edgcote took place.
President Harry Truman signed the National Security Act.
The Summer Olympic Games opening ceremony was held outdoors for the first time ever.
Alice in Wonderland premiered in London.
