Pull any bill out of your wallet. See the dark green numbers on the top-left and top-right corners? Those are serial numbers, and some are more rare than others. If you happen to have paper money with ...
Most people treat a $2 bill like a curiosity. You get one as change, tuck it in a drawer, and forget about it for years. It feels special somehow, but you're never quite sure why. That instinct to ...
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