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On July 4, 2012, in honour of its 111th anniversary, it was celebrated with a Google Doodle on Google's Canadian homepage.
On December 15, 2009, the Esperanto flag flew on the Google home search page "Google" logo to mark L.L. Zamenhof's 150th birthday.
On April 4, 2011, Google celebrated his 100th birthday by replacing the original Google logo with a doodle celebrating his works for a day on Google Czech Republic.