UK Prime Minister Boris Johnson resigned after numerous Conservative Party members voiced their lack of confidence in him.
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NASA's Opportunity Mars rover launched from the Florida Cape Canaveral Space Force Station.
'Harry Potter and the Deathly Hallows – Part 2' premiered in London.
Spanish conquistadors defeated a large Aztec army at the Battle of Otumba.
The world celebrated the introduction of sliced bread for the first time.
Tourists in Kazakhstan beat a seal unconscious on a beach so that children could take pictures with it.