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Mass of Pedal Harp (orchestral instrument) (36 kg) is 5 x Mass of a regulation mens' shot (in the shot put athletics event) (7.26 kg)
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Number of passengers on an Underground train on London's Northern Line (800 )
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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