Did you know? Time since extinction of Neanderthals (30,000 y) is 2 x Time since first humans in Americas (15,000 y)
Diameter of a US 1c coin (19 mm)
/fact/diameter-of-a-us-1c-coin
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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