Did you know?
Height of Mons Huygens (highest point on the moon) (5.5 km) is 50 thousand x Width of a Penguin paperback book (111 mm)
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Height of the Hoover dam wall (221.4 m)
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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