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Pop. of Hanoi, Vietnam (7.23 million people) is about as big as Pop. of Hong Kong (7.21million)
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Energy released by exploding 1g of TNT (4.2 kJ)
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.