Today in History, March 31st:

1889 - The Eiffel Tower is inaugurated.

1918 - Daylight saving time goes into effect in the United States for the first time.

1930 - The Motion Pictures Production Code is instituted, imposing strict guidelines on the treatment of sex, crime, religion and violence in film for the next thirty eight years.

1968 - President Lyndon B. Johnson announces he will not run for re-election.

1990 - 200,000 protestors took to the streets of London to protest against the newly introduced Poll Tax.

1994 - Human evolution: The journal Nature reports the finding in Ethiopia of the first complete Australopithecus afarensis skull.

2007 - In Sydney, Australia, 2.2 million people take part in the first Earth Hour.

2008 - Aloha Airlines, a bankrupt airline, permanently ends passenger service