Did you know? Pop. of Baghdad, Iraq (7.18 million people) is 2 x Pop. of Hangzhou, China (3.56 million people) Tweet this comparison
Time since the end of the Cambrian geologic period (485 million y)
/fact/time-since-the-end-of-the-cambrian-geologic-period
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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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