A day like today, but throughout history there were many events that you might like to know:
April 4, 1920: Arab nationalists attack the Jewish population in Jerusalem, initiating a series of violent disturbances that mark the beginning of the Arab-Israeli conflict.
April 4, 1926: after crossing the South Atlantic, the Spanish crew of the Plus Ultra hydroplane return triumphantly.
April 4, 1949: in Washington, twelve countries sign the North Atlantic Treaty, thus creating NATO.
April 4, 1958: in London, a demonstration of 10,000 people against the atomic bomb creates the pacifist movement.
April 4, 1959: the Sudanese Republic and Senegal form the Federation of Mali.
April, 1961: in Cuba the OPJM (Organization of Pioneers José Martí) is founded.
April 4, 1962: in Cuba is based the UJC (Union of Young Communists).
April 4, 1968: Martin Luther King Jr. is killed by a sniper in Memphis, Tennessee.
April 4, 1969: at the San Lucas Clinic in Houston (Texas), the first implant of an artificial heart is performed.
April 4, 1973: The World Trade Center opens in New York, United States.
April 4, 1975: in California (USA) Bill Gates and Paul Allen founded the Microsoft software company.
April 4, 1981: in Dublin the group Bucks Fizz wins for the United Kingdom the XXVI Edition of Eurovisión with the song Making your mind up.
April 4, 1997: 21 countries of the Council of Europe sign the agreement on Human Rights and Biomedicine, which includes the prohibition of cloning human beings.