Today is Zamenhofa Tago, or Zamenhof Day, the birthday of Ludwig Zamenhof, the inventor of Esperanto. Readers of this blog know that I am an advocate of Esperanto. Learning Esperanto is worthwhile in its own right, but is also may help you learn other languages.
To give you an idea of the worldwide Esperanto community. Here, in Esperanto, is a video of a Zamenhof Day celebration held a few years ago in Brazil:
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