Commonwealth of Nations, becoming the first small country in the Commonwealth. Monash University in Melbourne, Australia takes in its first students. A second B-52 crashes near Yuba City, California, after cabin pressure is lost and the fuel runs out. Two nuclear weapons are found unexploded. March 15 South Africa announces it will withdraw from the Commonwealth of Nations, upon becoming a republic (31 May). The nation rejoins the organization in 1994. The Union of Peoples of Angola, led by Holden Roberto, attacks strategic locations in the north of Angola. These events result in the beginning of the colonial war with Portugal. March 18 A ceasefire takes effect in the Algerian War of Independence. Nous les amoureux by Jean-Claude Pascal (music by Jacques Datin, text by Maurice Vidalin) wins the Eurovision Song Contest 1961 for Luxembourg. March 29 – The Twenty-third Amendment to the United States Constitution is ratified, allowing residents of Washington, D.C. to vote in presidential elections. March 30 – The Single Convention on Narcotic Drugs is signed at New York. April April 5 – The New Guinea Council of Western Papua is installed. April 8 – British India Steam Navigation Company passenger ship blows up and sinks off Dubai; 238 passengers and crew are killed. April 11 – The trial of Nazi Adolf Eichmann begins in Jerusalem. April 12 Vostok 1: Soviet cosmonaut Yuri Gagarin becomes the first human in space, orbiting the Earth once before parachuting to the ground. Albert Kalonji takes the title Emperor Albert I Kalonji of South Kasai. Bernard Schwarz gets the patent for the body electrode. April 13 – In Portugal, a coup attempt against António de Oliveira Salazar fails. April 17 The Bay of Pigs Invasion of Cuba begins; it fails by April 19. The 33rd Academy Awards ceremony is held in Santa Monica, California: The Apartment (1960) wins most awards, including Best Picture. April 18 – Portugal sends its first military reinforcement to Angola. April 20 – Fidel Castro announces that the Bay of Pigs Invasion has been defeated. April 22 – Algiers putsch: Four French generals who oppose de Gaulle's policies in Algeria fail in a coup attempt. April 23 – Judy Garland performs in a legendary comeback concert at Carnegie Hall in New York City. April 24 – Swedish warship Vasa, sunk on her maiden voyage in 1628, is recovered from Stockholm Harbor. April 27 President Kennedy urges newspapers