On this day — October 20

The Syrian Democratic Forces (SDF) declare victory in the Raqqa campaign.

Rebel forces capture Libyan dictator Muammar Gaddafi and his son Mutassim in his hometown of Sirte and kill them shortly thereafter, ending the first Libyan civil war.

Scientific and Cultural Organization (UNESCO) passes the Convention on the Protection and Promotion of the Diversity of Cultural Expressions.

once the largest cosmic structures known to humanity, is discovered by students at Princeton University.

premieres on BBC.

killing more than 1,000 people.

California killing 25 people and destroying more than 3,000 homes, apartments and condominiums.

66 people are crushed to death in the Luzhniki disaster.

Six people, including three band members, are killed.

Attorney General Elliot Richardson and Deputy Attorney General William Ruckelshaus after they refuse to fire special prosecutor Archibald Cox, who is finally fired by Solicitor General Robert Bork.