American swimmer Michael Phelps became the first person to win eight gold medals at one Olympic Games.
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Female rowing duo Heather Stanning & Helen Glover claimed Team GB's first Olympic medal at the London Olympics.
The Summer Olympic Games opening ceremony was held outdoors for the first time ever.
Queen Elizabeth II of England declared the 30th Olympics opened in London, UK.
The first modern international Olympic Games began in Athens, Greece.
Australian swimmer Kyle Chalmers won the 100-meter freestyle gold medal in the Rio de Janeiro Olympics.
