Why dimes, quarters, and half dollars have grooved edges

The grooved edges on dimes, quarters, and half dollars serve a practical security purpose: they make it harder for people to clip a tiny bit off the coin, which was a common way to steal metal and thus value. Unlike pennies and nickels, these coins are made from more valuable metals, creating a higher incentive for such tampering. This design choice dates back to a time when coin fraud was a bigger concern, and it continues to play a role in preventing modern forms of coin manipulation.