Did you know? Mass of a mature Holstein cow (680 kg) is 50 x Mass of a half-filled sandbag as used in flood control (13.6 kg)
GDP in Tonga (2017) (455 million USD p/a)
/fact/gdp-in-tonga
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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