These are very old folk stories that explain the creation of our world or how we should behave.
One of the most popular fables is The Tortise and the Hare, one of Aesop's Fables. Aesop was a slave who lived during the time of the Greek Empire (a very long time ago) and recorded many of the popular folk tales of his lifetime. These stories usually end with a statement of the moral (or important message) of the story.
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