Did you know?
Depth of the Mponeng Gold Mine (South Africa) (3.9 km) is 25 x Height of Cologne Cathedral spires, Germany (157 m)
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Diameter of a regulation pool ball (57.1 mm)
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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