1st April 1924 - Adolf Hitler is sentenced to five years in jail for his participation in the "Beer Hall Putsch". However, he spends only nine months in jail, during which he writes the book Mein Kampf.
1st April 1970 - President Richard Nixon signs the Public Health Cigarette Smoking Act into law, requiring the Surgeon General's warnings on tobacco products and banning cigarette advertisements on television and radio in the United States starting on January 1, 1971.
1st April 1936 - Orissa Formerly known as Kalinga or Utkal became a state in India.
1st April 1973 - Project Tiger, a tiger conservation project, is launched in the Corbett National Park, India.
1st April 1976 - Apple Computer is formed by Steve Jobs and Steve Wozniak.
1st April 1979 - Iran becomes an Islamic Republic by a 98% vote, officially overthrowing the Shah.
1st April 1980 - New York City's Transit Worker Union 100 begins a strike lasting 11 days.
1st April 1981 - Daylight saving time is introduced in the USSR.
1st April 1997 - Comet Hale-Bopp is seen passing over perihelion.
1st April 2001 - Same-sex marriage becomes legal in the Netherlands, the first country to allow it.
1st April 2002 - The Netherlands legalizes euthanasia, becoming the first nation in the world to do so.
1st April 2004 - Google introduces its Gmail product to the public. The launch is met with scepticism on account of the launch date.
