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From today's featured article

The Blue Marble, a photograph of Earth taken by the Apollo 17 crew

Earth is the third planet from the Sun and the only astronomical object known to harbor life. It is the densest planet in the Solar System and the largest and most massive of the four rocky planets. About 29% of Earth's surface is land, with the remaining 71% covered with water and much of Earth's polar regions covered in ice. Earth's interior is active with a solid iron inner core, a liquid outer core that generates Earth's magnetic field, and a convective mantle that drives plate tectonics. Earth formed over 4.5 billion years ago. Within the first billion years of Earth's history, life appeared in the oceans and began to affect Earth's atmosphere and surface. Since then, the combination of Earth's distance from the Sun, physical properties and geological history have allowed life to evolve and thrive. Almost 8 billion humans live on Earth and depend on its biosphere and natural resources for their survival, but increasingly impact Earth's surface, atmosphere and other life. (This article is part of a featured topic: Solar System.)

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Did you know ...

Auliʻi Cravalho

... that Auliʻi Cravalho (pictured) was the last person to audition for the role of the eponymous character in Moana and was ultimately cast for the role?
... that Julie Pomagalski rose 20 places to first place at the FIS Snowboard World Cup in three years?
... that fens are fed by mineral-rich groundwater, while bogs are fed by mineral-poor precipitation?
... that the Catholic Church barred Deborah Schembri from practicing law in ecclesiastical court because she led a campaign to legalize divorce in Malta?
... that following an engine failure, United Airlines Flight 328 rained debris over Broomfield, Colorado?
... that the Dresdner Kapellsolisten, formed in 1994 mostly by instrumentalists of the Staatskapelle Dresden, focus on composers from Dresden including Johann Georg Pisendel?
... that Donald Heirman was given the nickname "Mr. EMC Standards" for his work on developing technical standards for electromagnetic compatibility?
... that the species name of the frog Boophis haingana is derived from the Malagasy word for 'fast'?

In the news

KRI Nanggala in 2015

KRI Nanggala (pictured), an Indonesian Navy submarine, goes missing in the Bali Sea with 53 people on board.
In the United States, former police officer Derek Chauvin is found guilty of the murder of George Floyd.
President of Chad Idriss Déby is killed during a rebel offensive.
Miguel Díaz-Canel is selected as First Secretary of the Communist Party of Cuba, succeeding Raúl Castro.
On Mars, NASA's helicopter Ingenuity makes the first powered flight on another planet.

On this day

April 22

Pedro Álvares Cabral

1500 – A fleet commanded by Pedro Álvares Cabral (pictured) anchored off the coast of present-day Brazil, claiming the land for the Portuguese Empire.
1864 – The U.S. Congress authorized the creation of a two-cent coin, the first U.S. currency to bear the phrase "In God We Trust".
1951 – Korean War: The Chinese People's Volunteer Army attacked positions occupied mainly by Australian and Canadian forces, starting the Battle of Kapyong.
1993 – Stephen Lawrence, a black British teenager, was murdered while waiting for a bus in Eltham, London, leading to cultural changes of attitudes on racism and the police, and to the law and police practice.
2013 – The Royal Canadian Mounted Police arrested two men who were plotting to commit terrorist attacks against Via Rail operations.

James Sullivan (b. 1744)
Emily Davies (b. 1830)
Käthe Kollwitz (d. 1945)

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Today's featured picture

This poster was produced in May 1915 to advertise recruitment to the British Army during the First World War. Created for the Parliamentary Recruiting Committee, the poster depicts two women and a child looking out of an open window at a column of soldiers marching past, with the text "Women of Britain Say – 'Go!'". At the beginning of 1914, the British Army had a reported strength of 710,000 men, including reserves. By the end of hostilities, over five million men had joined up, 2.67 million as volunteers and 2.77 million as conscripts.

Poster credit: E. J. Kealey; restored by Adam Cuerden

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