44 BC – Julius Caesar, Dictator of the Roman Republic, is stabbed to death by Marcus Junius Brutus, Gaius Cassius Longinus, Decimus Junius Brutus and several other Roman senators on the Ides of March.

1995 – Space Exploration: Astronaut Norman Thagard becomes the first American astronaut to ride to space on board a Russian launch vehicle.

1994 – Timeline of Linux development: Linux kernel version 1.0.0 is released.

1900 – The Gold Standard Act is ratified, placing United States currency on the gold standard.

1962 – Lyman Lemnitzer, chairman of the Joint Chiefs of Staff, delivers a proposal, called Operation Northwoods, regarding performing terrorist attacks upon Guantánamo Bay Naval Base, to Secretary of Defense Robert McNamara. The proposal is scrapped and President John F. Kennedy removes Lemnitzer from his position.

1781 – William Herschel discovers Uranus.

2011 – A reactor at the Fukushima Daiichi Nuclear Power Plant melts and explodes and releases radioactivity into the atmosphere a day after Japan's earthquake.

1930 – Mahatma Gandhi leads a 200-mile march, known as the Salt March, to the sea in defiance of British opposition, to protest the British monopoly on salt.

1918 – Moscow becomes the capital of Russia again after Saint Petersburg held this status for 215 years.

1912 – The Girl Guides (later renamed the Girl Scouts of the USA) are founded in the United States.

1894 – Coca-Cola is bottled and sold for the first time in Vicksburg, Mississippi, by local soda fountain operator Joseph Biedenharn.

2006 – The Mars Reconnaissance Orbiter arrives at Mars.

1977 – Rings of Uranus: Astronomers discover rings around Uranus.

1876 – Alexander Graham Bell makes the first successful telephone call by saying "Mr. Watson, come here, I want to see you."

1979 – Philips demonstrates the Compact Disc publicly for the first time.

1978 – The first radio episode of The Hitchhiker's Guide to the Galaxy, by Douglas Adams, is transmitted on BBC Radio 4.

2009 – The Kepler space observatory, designed to discover Earth-like planets orbiting other stars, is launched.

1876 – Alexander Graham Bell is granted a patent for an invention he calls the telephone.

1981 – After 19 years of presenting the CBS Evening News, Walter Cronkite signs off for the last time.

1869 – Dmitri Mendeleev presents the first periodic table to the Russian Chemical Society.