Albert Einstein’s theory of gravitational redshift was proven after a telescope in Chile observed a black hole.
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The US Postal Service was founded.
Platform diver Tom Daley won his first Olympic gold medal in men's synchronized diving, 13 years after his first Olympic games.
Asiana Airlines Flight 733 crashed in South Korea.
Niger President Mohamed Bazoum was removed from office by a military coup.
New York became the 11th state to join the United States of America.
