It happened on… September 21

Scientists discover the first brainless animal, the Cassiopea jellyfish.

The new Ottawa Senators play an exhibition game at the Ottawa Civic Center. The team returns to the NHL after a 58-year absence. In 1934, the team had been relocated from Ottawa to St. Louis.

The sports program “Monday Night Football” airs for the first time on ABC. Browns 31, Jets 21.

Jimmy Hendrix changes his first name to Jimi.

The Place des Arts opens in Montreal.

The TV series “Perry Mason,” starring Raymond Burr, premieres on CBS.

In his final fight, undefeated heavyweight champion Rocky Marciano knocks out Archie Moore in the 9th round of a bout held at Yankee Stadium, NY.

British author J.R.R. Tolkien publishes the fantasy novel “The Hobbit.”

The first Western film, Kit Carson, premieres in theaters in the United States.

The National Convention votes to abolish the monarchy in France.