Today's Google Doodle commemorates the birthday of American-born opera singer Maria Callas, who was born Dec. 2, 1923 in New York City. The Doodle depicts Callas singing against the backdrop of an opera house.

Famous for her bel canto technique, Callas was praised as one of the greatest opera singers of the century.
She was also known for several scandals throughout her life, including an affair with Greek shipping magnate Aristotle Onassis, for whom she left her husband Giovanni Battista Meneghini.
Callas died at age 53 on Sep. 16, 1977 in Paris, of a heart attack.
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Each package gets larger with a mouse-over, and a click on it returns search results pertinent to a specific country or the particular items featured in a scene. This one is from December 24, 2010.
The Google Doodle team stars in an homage to the silent film era's greatest star's 122nd birthday, April 15, 2011.
This one's done in HTML5 and was published Sept. 7, 2010. To get the full effect, here's one you can interact with.
This Doodle commemorated John Lennon's 70th birthday in October 2010.
Debuting May 10, 2011, this Google Doodle marks dance choreographer Martha Graham's birthday.
Commemorated the birthday of the inventor of the Bunsen burner, German chemist Robert Bunsen on March 31, 2011.
The great inventor's birthday was honored on February 11, 2011.
Marking Independence Day 2010.
A real crowd pleaser was this playable Pac-Man game, which appeared on May 21. 2010. Here's a playable version.
Image: Erich Auerbach/Getty Images, Google