Believe It Or Not, These Aren't Actually Design Flaws

Ridges on the Edges of Coins

Dimes and quarters have rough edges while pennies and nickels have smooth edges. Ever wonder why? Back when currency was in the form of coins only, the money was stamped with the weight and value of its particular metal. Eventually, people learned how to shave off parts of the coin and still spend them at a fraction of the value, so then paper currency was created.

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