August 12: Mother's Day in Thailand; International Youth Day.
- 1099 – The First Crusade concluded with the Battle of Ascalon and Fatimid forces under Al-Afdal Shahanshah retreating to Egypt.
- 1121 – Forces led by David the Builder decisively won the Battle of Didgori, driving Ilghazi and the Seljuk Turks out of Georgia.
- 1953 – History of nuclear weapons: The first Soviet thermonuclear bomb, Joe 4, was detonated at Semipalatinsk, Kazakh SSR.
- 1985 – Japan Airlines Flight 123 crashed in Gunma Prefecture, Japan, killing 520 of 524 on board in the world's worst single-aircraft aviation disaster.
- 1990 – American paleontologist Sue Hendrickson found the most complete skeleton of a Tyrannosaurus (pictured) near Faith, South Dakota, USA.
More events on this day... Recent days: August 11 – August 10 – August 9
August 12: Mother's Day in Thailand; International Youth Day.
- 1099 – The First Crusade concluded with the Battle of Ascalon and Fatimid forces under Al-Afdal Shahanshah retreating to Egypt.
- 1121 – Forces led by David the Builder decisively won the Battle of Didgori, driving Ilghazi and the Seljuk Turks out of Georgia.
- 1953 – History of nuclear weapons: The first Soviet thermonuclear bomb, Joe 4, was detonated at Semipalatinsk, Kazakh SSR.
- 1985 – Japan Airlines Flight 123 crashed in Gunma Prefecture, Japan, killing 520 of 524 on board in the world's worst single-aircraft aviation disaster.
- 1990 – American paleontologist Sue Hendrickson found the most complete skeleton of a Tyrannosaurus (pictured) near Faith, South Dakota, USA.
More events on this day... Recent days: August 11 – August 10 – August 9