Did you know? Estimated world population of Hippopotamus (125,000 individuals) is 2.5 x High estimate of population of Asian Elephant (2003) (50,000 individuals)
Time since the birth of Eratosthenes (2,299 y)
/fact/time-since-the-birth-of-eratosthenes
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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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