Did you know? Mass of Umbriel (moon of Uranus) (1.17 sextillion kg) is 400 x Mass of Puck (moon of Uranus) (2.9 quintillion kg)
Length of the Amazon River (6,990 km)
/fact/length-of-the-amazon-river
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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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