MORE EVENTS ON THIS DAY

2015: English author Jackie Collins , whose glamorous public persona echoed the lavish lifestyles of the characters in her provocative romance thrillers, died in Los Angeles. [Test your knowledge of famous authors.]

2011: Panamanian baseball pitcher Mariano Rivera registered his record-setting 602nd career save; when he retired in 2013, Rivera had an unprecedented 652 saves and was considered the sport's greatest relief pitcher. [ Did Mariano Rivera make our list of the 10 greatest baseball players of all time?]

1995: The Unabomber's manifesto—a 35,000-word antitechnology document written by Ted Kaczynski, who had launched a bombing campaign that killed 3 and wounded 23—was published in The New York Times and The Washington Post ; the manifesto helped lead to his capture.

1994: The medical drama ER debuted on NBC and became one of the highest-rated programs on television; it launched the careers of several actors, most notably George Clooney and Juliana Margulies. [Sort fact from fiction in our quiz about A-list actors.]

1991: In the Ötztal Alps on the Italian-Austrian border, German tourists discovered a mummified human body (later known as the Iceman) that was subsequently determined to date from 3300 bce. [Sort fact from fiction in our quiz about ancient life.]

1970: The first episode of the sitcom The Mary Tyler Moore Showaired on American television; the groundbreaking series starred Mary Tyler Moore as a single independent working woman at a time when female characters were defined as the wife, girlfriend, or widow of a male counterpart. [ Test your knowledge of pop culture.]