UK Prime Minister Boris Johnson resigned after numerous Conservative Party members voiced their lack of confidence in him.
Source
NASA's Opportunity Mars rover launched from the Florida Cape Canaveral Space Force Station.
Nelson Mandela stepped down as President.
The world celebrated the introduction of sliced bread for the first time.
Spanish conquistadors defeated a large Aztec army at the Battle of Otumba.
'Harry Potter and the Deathly Hallows – Part 2' premiered in London.