Did you know? Time since the end of the Permian geologic period (252 million y) is 4 x Length of one Alautun, longest unit in Mayan calendar (63.1 million y) Tweet this comparison
Pop. of Argentina (45.5million)
/fact/population-of-argentina
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If this was a standard unit ...
"This is a fun and riveting book. Written in an accessible and engaging way, it is unputdownable." Frost Magazine
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