https://www.sciencemag.org/news/2021/06/these-ancient-weights-helped-create-europe-s-first-free-market-more-3000-years-ago

Museum collection mining finds standard weights:

To their surprise, more than 2000 such objects crafted over the course of
> 2000 years and an area spanning nearly 5000 kilometers weighed nearly the
> same amount <https://www.pnas.org/cgi/doi/10.1073/pnas.2105873118>—between
> 8 and 10.5 grams from Great Britain to Mesopotamia. Over the time spans
> involved, the consistency was remarkable, they report today in the Proceedings
> of the National Academy of Sciences. “It is like we were still using the
> Roman systems of measurement [today], with just some minor variations,”
> Ialongo says.


roughly a generous dime bag of weed in the jersey suburbs of the 1960's.

via hackernews

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