Australian swimmer Kyle Chalmers won the 100-meter freestyle gold medal in the Rio de Janeiro Olympics.
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The Society for American Baseball Research was founded in Cooperstown, New York.
After a 15-month-long journey from earth, NASA's Magellan went into orbit around Venus and began to map the planet.
Missouri entered the United States Union and became the 24th state.
Two rival driverless taxi companies were given approval to operate 24/7 in San Francisco, California.
Portuguese explorer Diogo Dias became the first European to set foot on Madagascar.