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Mayan Revelations - Decoding Baqtun
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Mayan Revelations - Decoding Baqtun
Cycles in the Cosmos, Nature, and Humanity

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Cool documentary, but don't forget to turn the subtitles on. And that's some crazy math behind it all. It's not crazy. But it does make me head go POOF! And to think, I never learned this in school when I was a kid.