Did you know? Circumference of Neptune (154,600 km) is 2 thousand x Length of the Panama Canal (77 km)
Time since start of building of the Great Pyramid of Cholula (2,250 y)
/fact/time-since-start-of-building-of-the-great-pyramid-of-cholula
Link
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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