What Happened On This Day – March 21
2006 Jack Dorsey sends the world's first Twitter message, or tweet
The microblogging service revolutionized the communication and social networking landscape. In 2012, about 340 million tweets were posted per day.
1985 South African Police kill at least 21 black people commemorating a similar mass shooting 25 years before
The Sharpeville massacre in 1985 had left 69 unarmed people dead. It was a turning-point in the history of South Africa.
1970 Earth Day is celebrated for the first time
The first edition was limited to some cities in the United States. Today, Earth Day is observed by about 1 billion people around the world.
1952 The world's first rock and roll concert is held in Cleveland, Ohio
DJ Alan Freed presented the concert, which was closed down after only one song because of over-crowding.
1943 A plot to assassinate Adolf Hitler by suicide bomb fails
German Wehrmacht officer, Rudolf von Gersdorff, failed to blow up the dictator but managed to defuse his bombs just before they went off and avoid suspicion.
Births On This Day,
1978 Rani Mukerji
1960 Ayrton Senna
Brazilian race car driver
1940 Solomon Burke
1806 Benito Juárez
Mexican lawyer, politician, 25th President of Mexico
Deaths On This Day,
2013 Chinua Achebe
Nigerian author, poet, academic
2008 Klaus Dinger
German guitarist, songwriter
1843 Guadalupe Victoria
Mexican politician, 1st President of Mexico
1656 James Ussher
1556 Thomas Cranmer
English Archbishop of Canterbury