5. The Ridges on the Edge of Coins Aren’t Just for Looks — They Stopped Counterfeiting
Those little grooves (called “reeds”) on quarters, dimes, and other coins feel so normal you never question them. Back when coins were made of precious metals, people would shave off tiny bits of gold or silver to melt down and sell. The ridges made it obvious if someone had tampered with the coin.
Today the ridges are mostly tradition, but they’re still a 300-year-old anti-theft feature built into something you touch every day. If you’re over 35, you’ve carried thousands of coins in your pocket and never realized you were holding anti-counterfeiting technology from the 1600s.
