Did you know? Mass of all the Earth's biomass (560 trillion kg) is 2.5 thousand x Mass of water in Ullswater (English Lake District) (223 billion kg)
Length of one Alautun, longest unit in Mayan calendar (63.1 million y)
/fact/length-of-one-alautun-longest-unit-in-mayan-calendar
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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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