1. The find raised the possibility that Olmec pyramids might contain similar tombs of dignitaries, especially at well-known sites like La Venta.

2. They claim the Olmec left a clue from across the Atlantic long before Columbus.

3. Olmec pyramids, while well-known, have not been excavated, in part because the high water table and humidity of their Gulf coast sites are not as conducive to preserving buried human remains.

4. Around 680 B. C. by the Olmec civilization, started by Meso-American star charting who were recording astrological form of patterns in the sky and the Mayans shared this information eventually.

5. "The Olmec sites have not been explored with the depth they deserve, " said Lynneth Lowe, an archaeologist at Mexico's National Autonomous University who participated in the dig.

6. Archaeologists found traces of cacao use at an Olmec site in Honduras, dating to 1100-1400 B. C. The Maya of 250-900 A.

7. Could the Olmec heads depict African visitors from across the Atlantic?

8. The region has a number of undeciphered ancient scripts. Three haveattracted particular interest: Olmec, Zapotec and Isthmian.

9. Maize was certainly a primary focus of ritual and religious veneration by ancient Meso-American people, going back all the way before the Maya and even into the Olmec civilisation.

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10. Villagers in the Mexican state of Veracruz discovered the tablet sometime before 1999, while quarrying an ancient Olmec mound for road-building material.

11. The arrangement and pattern of the symbols suggest the ancient Olmec civilization was using written language roughly three centuries earlier than previously proposed.