| 11. | The Olmec-vixtoti Culture became the cuexteca or Huastec culture.
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| 12. | An Olmec mining colony has been identified in the Cintalapa valley.
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| 13. | This is the only known example from outside the Olmec heartland.
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| 14. | This is the only known example outside of the Olmec heartland.
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| 15. | Olmec colossal heads are an iconic form of ancient Mesoamerican sculpture.
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| 16. | The colossal Olmec heads demanded their due, and they got it.
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| 17. | The argument that the Olmec instituted human sacrifice is significantly more speculative.
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| 18. | The zero, may have been devised by the Olmecs.
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| 19. | Teopantecuanitlan is the most important Olmec era site in Guerrero.
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| 20. | The ethnic identity of the Olmecs is still widely debated.
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