Here’s the Surprising Reason Why Coins Have Ridged Edges

Here’s the Surprising Reason Why Coins Have Ridged Edges

You’d think that after spending decades on this planet—most of those using money—I’d have a handle on pocket change. But yesterday, while cleaning out the bottom of a junk drawer, I found a half-dollar coin. My first thought? Score! Now I can buy … well, not much these days. A half of a candy bar … on clearance? But as I stared at the coin longer, I found myself wondering, Why does this tiny disco pancake have ridges on the edges? Why have I nev…