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Mass of SpaceX Falcon 9 launch rocket (542,000 kg) is 40 thousand x Mass of a half-filled sandbag as used in flood control (13.6 kg)
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Time since the birth of Leonardo da Vinci (569 y)
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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