Did you know? Time since the birth of mathematician Hypatia (1,674 y) is 20 x Period of Uranus's orbit (84 y)
Number of passengers on an Underground train on London's Northern Line (800 )
/fact/number-of-passengers-on-an-underground-train-on-londons-northern-line
"This is a fun and riveting book. Written in an accessible and engaging way, it is unputdownable." Frost Magazine
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