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1916

Sirimavo Bandaranaike, Prime Minister of Sri Lanka, world's first female prime minister (died 2000)

Sirimavo Bandaranaike, Prime Minister of Sri Lanka, world's first female prime minister (died 2000)

2018

Barbara Bush, American political matriarch and literacy advocate, First Lady of the United States (1989–1993), and Secon

Barbara Bush, American political matriarch and literacy advocate, First Lady of the United States (1989–1993), and Second Lady of the United States (1981–1989) (born 1925)

2014

NASA announced the discovery of Kepler-186f, the first exoplanet with a radius similar to Earth's discovered in the habi

NASA announced the discovery of Kepler-186f, the first exoplanet with a radius similar to Earth's discovered in the habitable zone of another star.

1951

The Peak District was designated the first national park in the United Kingdom

The Peak District was designated the first national park in the United Kingdom.

1907

Minas Geraes (pictured), the first of three Brazilian dreadnought battleships, was laid down, sparking a vastly expensiv

Minas Geraes (pictured), the first of three Brazilian dreadnought battleships, was laid down, sparking a vastly expensive South American naval arms race with Argentina and Chile.

1980

The Republic of Zimbabwe (formerly Rhodesia) comes into being, with Canaan Banana as the country's first President

The Republic of Zimbabwe (formerly Rhodesia) comes into being, with Canaan Banana as the country's first President. The Zimbabwean dollar replaces the Rhodesian dollar as the official currency.

1980

The town of Elmore City, Oklahoma holds its first dance in the town's history

The town of Elmore City, Oklahoma holds its first dance in the town's history.

1955

Twenty-nine nations meet at Bandung, Indonesia, for the first Asian-African Conference

Twenty-nine nations meet at Bandung, Indonesia, for the first Asian-African Conference.

1783

Three-Fifths Compromise: The first instance of black slaves in the United States of America being counted as three-fifth

Three-Fifths Compromise: The first instance of black slaves in the United States of America being counted as three-fifths of persons (for the purpose of taxation), in a resolution of the Congress of t�

1980

Robert Mugabe became the first prime minister of Zimbabwe, beginning a 37-year period in power

Robert Mugabe became the first prime minister of Zimbabwe, beginning a 37-year period in power.

1938

Superman, created by Jerry Siegel and Joe Shuster of DC Comics, made his debut in Action Comics #1, the first true super

Superman, created by Jerry Siegel and Joe Shuster of DC Comics, made his debut in Action Comics #1, the first true superhero comic book.

2021

The Ingenuity helicopter becomes the first aircraft to achieve flight on another planet

The Ingenuity helicopter becomes the first aircraft to achieve flight on another planet.

2011

Fidel Castro resigns as First Secretary of the Communist Party of Cuba after holding the title since July 1961

Fidel Castro resigns as First Secretary of the Communist Party of Cuba after holding the title since July 1961.

1975

India's first satellite Aryabhata launched in orbit from Kapustin Yar, Russia

India's first satellite Aryabhata launched in orbit from Kapustin Yar, Russia.

1971

Launch of Salyut 1, the first space station

Launch of Salyut 1, the first space station.

1943

Albert Hofmann deliberately doses himself with LSD for the first time, three days after having discovered its effects on

Albert Hofmann deliberately doses himself with LSD for the first time, three days after having discovered its effects on April 16, an event commonly known and celebrated as Bicycle Day.

1987

The fictional Simpson family made their first appearance in the short "Good Night", aired in a segment of the The Tracey

The fictional Simpson family made their first appearance in the short "Good Night", aired in a segment of the The Tracey Ullman Show.

1975

Aryabhata (pictured), India's first satellite, was launched from Kapustin Yar in the Soviet Union

Aryabhata (pictured), India's first satellite, was launched from Kapustin Yar in the Soviet Union.

1971

Salyut 1, the first space station, was launched from the Baikonur Cosmodrome near Tyuratam in the Soviet Union

Salyut 1, the first space station, was launched from the Baikonur Cosmodrome near Tyuratam in the Soviet Union.

1773

The Polish Partition Sejm met to discuss the First Partition of Poland, carried out the previous year by Russia, Prussia

The Polish Partition Sejm met to discuss the First Partition of Poland, carried out the previous year by Russia, Prussia and Austria.