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Estimated world population of Black Wildebeest (18,000 individuals) is 50 x Number of ways a travelling salesman can visit six towns (and return home) (360 )
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Mass of an iPhone 7 Plus smartphone (188 g)
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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