Did you know? Time since the first modern humans (250,000 y) is 200 x Time since the birth of al-Khwarizmi (1,246 y)
Length of the Kiel Canal (98 km)
/fact/length-of-the-kiel-canal
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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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