[post_page_title]Coins[/post_page_title]
A lot of people have wondered why dimes and quarters have ridges along the edges, while the edges on pennies and nickels are smooth. The answer goes back to the 18th century, when quarters and half-dollars were made from gold, and all other coins were made from silver and copper.
Soon enough, criminals started shaving off the sides and selling the precious metal residue for profit. As a result, the U.S. Mint started ridging the edges so that it was obvious if the coins were tampered with.
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