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Mass of the Earth (5.97 septillion kg) is 40 x Mass of Ganymede (moon of Jupiter) (148.2 sextillion kg)
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Pop. of Nairobi, Kenya (3.138 million people)
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"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.