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Mass of water in the Three Gorges Dam (China) (39.3 trillion kg) is 10 x Mass of water in Lake Zurich (3.9 trillion kg)
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Height of the spire of Salisbury cathedral (123 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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