A decade ago, a funny money mystery fell into the hands of scientists and students at the Pontifical Catholic University of Peru in Lima.
The university had been acquiring 19th- and 20th-century Peruvian coins from local dealers, and graduate students in the chemistry department were analyzing the pieces for their thesis work. But one coin, a 10-cent piece known as a dinero, stood out.
The dinero was marked “1899.” The problem was that official records indicated no coins of that denomination were minted in Peru that…
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