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Mass of the lightest allowable regulation baseball (142 g) is 2.5 x Mass of a regulation tennis ball (57 g)
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Pop. of Kabul, Afghanistan (3.41 million people)
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.