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Mass of Empire State Building (331 million kg) is 25 x Mass of Brooklyn Bridge (13.32 million kg)
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Forest in Bulgaria (2011) (40,700 km^2)
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.