Did you know? Pop. of United States (2023) (340million) is 40 x Pop. of Switzerland (2023) (8.56million)
Period of Halley's Comet's orbit (75.3 y)
/fact/period-of-halleys-comets-orbit
Link
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.