In History, Today on April 3

A shooting at the YouTube headquarters in San Bruno, California, USA, resulted in the injury of three people before the shooter took her own life.

A terrorist attack occurred on the St. Petersburg Metro in Russia, killing 15 people and injuring 45 others. The attack was carried out by a suicide bomber.

The Panama Papers were leaked, revealing how wealthy individuals and public officials used offshore tax regimes.

Apple Inc. released the first generation iPad, marking a significant milestone in the development of tablet computing.

The first episode of the television series 'The Tudors' premiered on Showtime, marking a significant cultural moment in historical drama television.

Islamic militants launch a series of coordinated bombings in the southern Philippines, killing 21 people and injuring over 100.

United States v. Microsoft Corp. ruling was issued, finding Microsoft guilty of violating antitrust laws by maintaining a monopoly on PC operating systems.

The Unabomber, Ted Kaczynski, was arrested at his cabin in Montana.

The Super Outbreak, the second largest tornado outbreak on record, occurred in the United States and Canada, with a total of 148 tornadoes confirmed over an 18-hour period.

The first handheld mobile phone call was made by Martin Cooper of Motorola to Dr. Joel S. Engel of Bell Labs.

Martin Luther King Jr. delivered his famous "I've Been to the Mountaintop" speech in Memphis, Tennessee, the day before his assassination.

President Harry S. Truman signed the Marshall Plan, officially known as the European Recovery Program, to aid Western Europe's economic recovery after World War II.

Bruno Richard Hauptmann was executed in New Jersey State Prison for the kidnap and murder of Charles Lindbergh Jr., the infant son of aviator Charles Lindbergh.

Joseph Stalin became the first General Secretary of the Communist Party of the Soviet Union.

Outlaw Jesse James was shot and killed by Robert Ford.

The Pony Express mail service begins its first run from St. Joseph, Missouri, to Sacramento, California.

The first General Union of Authors and Composers, a precursor to copyright societies, is founded in Paris.

Robert Walpole became the first Prime Minister of Great Britain. Though the title 'Prime Minister' was not in official use, Walpole is generally accepted as the first person to hold the office in its modern sense, dominating the Cabinet of Great Britain.

A peace treaty was signed between Tsar Ivan IV of Russia and Stephen Báthory of the Polish–Lithuanian Commonwealth, significantly shaping Eastern European politics. This agreement was part of ongoing negotiations to end the Livonian War, where the Russian tsardom sought a truce with the Polish–Lithuanian forces.

The Peace of Cateau-Cambrésis was signed, effectively ending the Italian Wars. This accord marked the conclusion of hostilities between the Kingdom of France and the Habsburg powers of Spain and the Holy Roman Empire. The treaty allowed Spain to retain control of Italy, solidifying its influence in the region, while France was forced to accept its territorial losses.

Henry IV of England was born.

Edward the Confessor was crowned King of England.

King Louis the Pious captures Barcelona from the Moors, marking a significant expansion of the Carolingian Empire into the Iberian Peninsula.

The Battle of Two Rivers took place, where the Picts defeated the Northumbrians, marking a significant event in the power struggles of early medieval Britain.