Did you know? Time since the first iron steamship crossed the English Channel (202 y) is 2.5 x Time since introduction of the first mass-produced helicopter (Sikorsky R-4) (80 y)
Duration of Toltec Empire (626 y)
/fact/duration-of-toltec-empire
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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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