Swan Lake / Big Mac / Earth Day / Blues Brothers

Pedro Álvares Cabral discovered Brazil, landing near Monte Pascoal and claiming it for Portugal.

Pyotr Ilyich Tchaikovsky finished his ballet "Swan Lake".

Boston Red Caps beat Philadelphia Athletics, 6-5, in the first official National League game.

Thousands of people rush into the newly opened Oklahoma Territory to claim cheap land.

The first use of poison gas was by Germany on the Western Front at Ypres, France, in World War I.

The US Senate Army-McCarthy televised hearings begin.

The Big Mac was introduced in Uniontown, Pennsylvania, by a McDonald's franchisee for 45 cents.

Earth Day, which aims to raise awareness of global environmental issues, was first celebrated in the U.S.

"Saturday Night Live" features the debut of the Blues Brothers, the musical creation of cast members Dan Aykroyd and John Belushi.

Tucson's First National Bank was robbed of more than $3.3 million in one of the largest bank robberies in history.

Holocaust Memorial Museum opens in Washington, D.C.

7,000 Tutsi were killed by Hutus in the stadium at Kibuye, Rwanda.

The Paris Agreement, signed in New York, commits 195 nations to limit the global temperature rise to below 2°C above pre-industrial levels, with efforts to cap it at 1.5°C.