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Time since the building of Great Wall of China (1,800 y) is 25 x Time since the invention of the transistor (72 y)
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Estimated population of Red Kangaroo (2011) (11.5 million individuals)
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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Click here for Podcast: Andrew Elliott interviewed for New Books Network.