Wikipedia:Selected anniversaries/April 22

April 22: Earth Day.

Pedro Álvares Cabral

• 1500 - Portuguese explorer Pedro Álvares Cabral (pictured) and his crew became the first Europeans to sight Brazil.

• 1913 - The Bolshevik newspaper Pravda was first published in Saint Petersburg, Russia.

• 1915 - Chlorine gas was released as a chemical weapon in the Second Battle of Ypres, the first large-scale use of poison gas in World War I.

• 1930 - The London Naval Treaty, regulating submarine warfare and limiting shipbuilding, was signed.

• 2000 - In a predawn raid, U.S. federal agents seized six-year-old Elián González from his relatives' home in Miami, Florida and returned him to his Cuban father.

Recent days: April 21 – April 20 – April 19

More anniversaries:

• March 31
• April 1
• April 2