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Mass of a regulation tennis ball (57 g) is 10 x Mass of a USA quarter (25c piece) (5.67 g)
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Forest in Tanzania (2011) (22,940 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.