Did you know? Period of Halley's Comet's orbit (75.3 y) is 5 x Time since first iPhone launched (15 y)
Length of a Marathon race (42.2 km)
/fact/length-of-a-marathon-race
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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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Click here for Podcast: Andrew Elliott interviewed for New Books Network.