Did you know? Time since the end of the Neogene geologic period (2.58 million y) is 500 x Age of oldest wooden wheel (5,150 y) Tweet this comparison
Pop. of China (1.394billion)
/fact/population-of-china
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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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