Did you know? Mass of water in Lake Kariba (180 trillion kg) is 500 x Mass of all the humans on Earth (358 billion kg)
Number of submarines in the North Korean Navy (2023) (35 )
/fact/number-of-submarines-in-the-north-korean-navy-2023
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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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