![The Mystery of the Coin That Shouldn’t Exist](https://static01.nyt.com/images/2024/01/07/science/07tb-dinero/07tb-dinero-facebookJumbo.jpg)
The Mystery of the Coin That Shouldn’t Exist
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,…