Long before money became numbers on a screen, it was metal you could weigh in your hand—and shave with a knife. People quietly trimmed slivers from gold and silver coins, melting the scraps into illicit profit while passing lighter, damaged coins at full value. Each tiny theft seemed harmless. Together, they hollowed out trust, slowed trade, and threatened entire economies that depended on belief in the weight of a coin.

Isaac Newton, placed in charge of England’s Royal Mint, understood that laws could not repair what design had allowed. His answer was not a sermon on honesty, but an edge that could not lie. With reeded rims, any tampering left a visible wound. Clipping withered. Confidence returned. The crisis passed, but the ridges stayed. Even now, when coins are mostly symbolic metal, those grooves quietly remind us that durable systems do not assume virtue; they anticipate temptation, expose it, and keep going.