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Time since start of building of the Parthenon (2,466 y) is 10 x Period of Pluto's orbit (248 y)
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Number of trees in the world (3 trillion 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.