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Mass of a half-filled sandbag as used in flood control (13.6 kg) is 400 x Mass of a South African Krugerrand coin (33.9 g)
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Mass of an ostrich (approx) (111 kg)
If this was a standard unit ...
Yes, there's now a book based on these numbers. Oxford University Press: July 2018.
Click here to learn more about it.
Click here for Podcast: Andrew Elliott interviewed for New Books Network.