Germanwings Flight 9525 crashes in the French Alps in an apparent pilot mass murder-suicide, killing all 150 people on board.
Bhutan officially becomes a democracy, with its first ever general election.
The Arab League votes 21-1 in favor of a resolution demanding the immediate and unconditional removal of U.S. and British soldiers from Iraq.
A lorry carrying margarine and flour catches fire inside the Mont Blanc Tunnel. The resulting inferno kills 38 people.
Kosovo war: NATO began attacks on Yugoslavia without United Nations Security Council (UNSC) approval, marking the first time NATO has attacked a sovereign country.
First computer-assisted Bone Segment Navigation, performed at the University of Regensburg, Germany
A tornado sweeps through Dantan in India, killing 250 people and injuring 3,000 others.
Mitchell Johnson and Andrew Golden, aged 11 and 13 respectively, fire upon teachers and students at Westside Middle School in Jonesboro, Arkansas; five people are killed and ten are wounded.
Discovery of Comet Shoemaker-Levy 9.
In Prince William Sound in Alaska, the Exxon Valdez spills 240,000 barrels (38,000 m3) of crude oil after running aground.
The Loscoe gas explosion leads to new UK laws on landfill gas migration and gas protection on landfill sites.
El Salvadorian Archbishop Óscar Romero is assassinated while celebrating Mass in San Salvador.
In Argentina, the armed forces overthrow the constitutional government of President Isabel Perón and start a 7-year dictatorial period self-styled the National Reorganization Process.
Kenyan athlete Kip Keino defeats Jim Ryun at the first-ever professional track meet in Los Angeles.
Images from the Ranger 9 lunar probe are broadcast live on network television.
Quebec Board of the French Language is established.
Rock 'n' roll teen idol Elvis Presley is drafted in the U.S. Army.
A British Cabinet Mission arrives in India to discuss and plan for the transfer of power from the British Raj to Indian leadership.
World War II: In an event later dramatized in the movie The Great Escape, 76 Allied prisoners of war begin breaking out of the German camp Stalag Luft III.
Ardeatine massacre: German troops murder 335 Italian civilians in Rome.
United States Congress passes the Tydings-McDuffie Act, allowing the Philippines to become a self-governing commonwealth.
Nanking Incident: Foreign warships bombard Nanjing, China, in defense of the foreign citizens within the city.
The 1921 Women's Olympiad begins in Monte Carlo, first international women's sports event
The first issue of the Georgian Bolshevik newspaper Dro is published.
Mayor of New York City Robert Anderson Van Wyck breaks ground for a new underground "Rapid Transit Railroad" that would link Manhattan and Brooklyn.
A. S. Popov makes the first radio signal transmission in history.
Sino-French War: Chinese victory in the Battle of Bang Bo on the Tonkin-Guangxi border.
Robert Koch announces the discovery of Mycobacterium tuberculosis, the bacterium responsible for tuberculosis.
The British frigate HMS Eurydice sinks, killing more than 300.
The last of Titokowaru's forces surrendered to the New Zealand government, ending his uprising.
Sakuradamon Incident: Assassination of Japanese Chief Minister (Tairō) Ii Naosuke.
Slavery is abolished in Venezuela.
Canada gives African Canadian men the right to vote.
In Hiram, Ohio, a group of men beat and tar and feather Mormon leader Joseph Smith.
The Parliament of the United Kingdom passes the Roman Catholic Relief Act 1829, allowing Catholics to serve in Parliament.
In Kraków, Tadeusz Kościuszko announces a general uprising against Imperial Russia and the Kingdom of Prussia, and assumes the powers of the Commander in Chief of all of the Polish forces.
Great Britain passes the Quartering Act, which requires the Thirteen Colonies to house British troops.
Naturalization of Hieronimus de Salis Parliamentary Act is passed.
Johann Sebastian Bach dedicated six concertos to Margrave Christian Ludwig of Brandenburg-Schwedt, now commonly called the Brandenburg Concertos, BWV 1046-1051.
Count Frederick of Hesse-Kassel is elected King of Sweden by the Riksdag of the Estates, after his consort Ulrika Eleonora abdicated the throne on 29 February
The Province of Carolina is granted by charter to eight Lords Proprietor in reward for their assistance in restoring Charles II of England to the throne.
Tokugawa Ieyasu is granted the title of shogun from Emperor Go-Yōzei, and establishes the Tokugawa shogunate in Edo, Japan.
James VI of Scotland becomes James I of England and Ireland, upon the death of Elizabeth I.
Turco-Mongol emperor Timur sacks Damascus.