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Time since start of building of the Colosseum (1,948 y) is 2 x Time since the birth of Omar Khayyam (974 y)
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Time since Concorde Supersonic Airliner entered service (46 y)
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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